tree: https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel head: 54c28df496f290b0dfbb55d569ce5ddf8cafc4be commit: 6f7621dd2f7f908ab9ca6882cebf663d4aac4e3e [25/28] mxser: switch to uart_driver config: arm-randconfig-c002-20220111 (https://download.01.org/0day-ci/archive/20220114/202201141428.PLNSXkwB-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 244dd2913a43a200f5a6544d424cdc37b771028b) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git/commi... git remote add jirislaby https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git git fetch --no-tags jirislaby devel git checkout 6f7621dd2f7f908ab9ca6882cebf663d4aac4e3e # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static const struct uart_ops mxser_ops = { ^ 1 warning generated. clang-analyzer warnings: (new ones prefixed by >>) 9 warnings generated. Suppressed 9 warnings (4 in non-user code, 5 with check filters). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 7 warnings generated. kernel/sched/deadline.c:1534:22: warning: Value stored to 'p' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct task_struct *p = dl_task_of(dl_se); ^ ~~~~~~~~~~~~~~~~~ kernel/sched/deadline.c:1534:22: note: Value stored to 'p' during its initialization is never read struct task_struct *p = dl_task_of(dl_se); ^ ~~~~~~~~~~~~~~~~~ Suppressed 6 warnings (4 in non-user code, 2 with check filters). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 4 warnings generated. Suppressed 4 warnings (4 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 4 warnings generated. Suppressed 4 warnings (4 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. drivers/iio/adc/ltc2497.c:18:8: warning: Excessive padding in 'struct ltc2497_driverdata' (32 padding bytes, where 0 is optimal). Optimal fields order: buf, client, common_ddata, consider reordering the fields or adding explicit padding members [clang-analyzer-optin.performance.Padding] struct ltc2497_driverdata { ~~~~~~~^~~~~~~~~~~~~~~~~~~~ drivers/iio/adc/ltc2497.c:18:8: note: Excessive padding in 'struct ltc2497_driverdata' (32 padding bytes, where 0 is optimal). Optimal fields order: buf, client, common_ddata, consider reordering the fields or adding explicit padding members struct ltc2497_driverdata { ~~~~~~~^~~~~~~~~~~~~~~~~~~~ Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 8 warnings generated. drivers/w1/w1.c:589:3: warning: Value stored to 'event_owner' is never read [clang-analyzer-deadcode.DeadStores] event_owner = "master"; ^ ~~~~~~~~ drivers/w1/w1.c:589:3: note: Value stored to 'event_owner' is never read event_owner = "master"; ^ ~~~~~~~~ drivers/w1/w1.c:590:3: warning: Value stored to 'name' is never read [clang-analyzer-deadcode.DeadStores] name = md->name; ^ ~~~~~~~~ drivers/w1/w1.c:590:3: note: Value stored to 'name' is never read name = md->name; ^ ~~~~~~~~ drivers/w1/w1.c:593:3: warning: Value stored to 'event_owner' is never read [clang-analyzer-deadcode.DeadStores] event_owner = "slave"; ^ ~~~~~~~ drivers/w1/w1.c:593:3: note: Value stored to 'event_owner' is never read event_owner = "slave"; ^ ~~~~~~~ drivers/w1/w1.c:594:3: warning: Value stored to 'name' is never read [clang-analyzer-deadcode.DeadStores] name = sl->name; ^ ~~~~~~~~ drivers/w1/w1.c:594:3: note: Value stored to 'name' is never read name = sl->name; ^ ~~~~~~~~ drivers/w1/w1.c:997:2: warning: Value stored to 'search_bit' is never read [clang-analyzer-deadcode.DeadStores] search_bit = 0; ^ ~ drivers/w1/w1.c:997:2: note: Value stored to 'search_bit' is never read search_bit = 0; ^ ~ drivers/w1/w1.c:999:2: warning: Value stored to 'last_rn' is never read [clang-analyzer-deadcode.DeadStores] last_rn = 0; ^ ~ drivers/w1/w1.c:999:2: note: Value stored to 'last_rn' is never read last_rn = 0; ^ ~ Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 5 warnings generated. drivers/tty/mxser.c:396:7: warning: Although the value stored to 'hwid' is used in the enclosing expression, the value is never actually read from 'hwid' [clang-analyzer-deadcode.DeadStores] if ((hwid = inb(io + UART_MCR)) != 0) { ^ drivers/tty/mxser.c:396:7: note: Although the value stored to 'hwid' is used in the enclosing expression, the value is never actually read from 'hwid' int_cnt = 0; ^ ~ drivers/tty/mxser.c:1693:4: note: Value stored to 'int_cnt' is never read int_cnt = 0; ^ ~ Suppressed 3 warnings (2 in non-user code, 1 with check filters). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. drivers/iio/adc/qcom-spmi-vadc.c:326:3: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores] ret = vadc_poll_wait_eoc(vadc, timeout); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/iio/adc/qcom-spmi-vadc.c:326:3: note: Value stored to 'ret' is never read ret = vadc_poll_wait_eoc(vadc, timeout); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 5 warnings generated. sound/isa/gus/interwave.c:686:2: warning: Call to function 'strcat' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcat'. CWE-119 [clang-analyzer-security.insecureAPI.strcpy] strcat(wss->pcm->name, " (codec)"); ^~~~~~ sound/isa/gus/interwave.c:686:2: note: Call to function 'strcat' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcat'. CWE-119 strcat(wss->pcm->name, " (codec)"); ^~~~~~ sound/isa/gus/interwave.c:740:2: warning: Call to function 'strcpy' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcpy'. CWE-119 [clang-analyzer-security.insecureAPI.strcpy] strcpy(card->driver, str); ^~~~~~ sound/isa/gus/interwave.c:740:2: note: Call to function 'strcpy' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcpy'. CWE-119 strcpy(card->driver, str); ^~~~~~ sound/isa/gus/interwave.c:741:2: warning: Call to function 'strcpy' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcpy'. CWE-119 [clang-analyzer-security.insecureAPI.strcpy] strcpy(card->shortname, str); -- if (unlikely(__ret_warn_on)) \ ^ drivers/nvme/host/fc.c:540:2: note: Memory is released kfree(rport); ^~~~~~~~~~~~ include/linux/kref.h:65:3: note: Returning; memory was released release(kref); ^~~~~~~~~~~~~ drivers/nvme/host/fc.c:548:2: note: Returning; memory was released kref_put(&rport->ref, nvme_fc_free_rport); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/nvme/host/fc.c:3826:3: note: Returning; memory was released nvme_fc_rport_put(rport); ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/nvme/host/fc.c:3829:3: note: Loop condition is false. Exiting loop spin_lock_irqsave(&nvme_fc_lock, flags); ^ include/linux/spinlock.h:384:2: note: expanded from macro 'spin_lock_irqsave' raw_spin_lock_irqsave(spinlock_check(lock), flags); \ ^ include/linux/spinlock.h:240:2: note: expanded from macro 'raw_spin_lock_irqsave' do { \ ^ drivers/nvme/host/fc.c:3829:3: note: Loop condition is false. Exiting loop spin_lock_irqsave(&nvme_fc_lock, flags); ^ include/linux/spinlock.h:382:43: note: expanded from macro 'spin_lock_irqsave' #define spin_lock_irqsave(lock, flags) \ ^ drivers/nvme/host/fc.c:3817:2: note: Loop condition is true. Entering loop body while (!list_empty(&local_disc_list)) { ^ drivers/nvme/host/fc.c:3820:3: note: Calling 'list_del_init' list_del_init(&rport->disc_list); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/list.h:206:2: note: Calling '__list_del_entry' __list_del_entry(entry); ^~~~~~~~~~~~~~~~~~~~~~~ include/linux/list.h:134:6: note: Assuming the condition is false if (!__list_del_entry_valid(entry)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/list.h:134:2: note: Taking false branch if (!__list_del_entry_valid(entry)) ^ include/linux/list.h:137:13: note: Use of memory after it is freed __list_del(entry->prev, entry->next); ^~~~~~~~~~~ Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. drivers/tty/serial/fsl_lpuart.c:1283:33: warning: The result of the left shift is undefined because the right operand is negative [clang-analyzer-core.UndefinedBinaryOperatorResult] sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1)); ^ drivers/tty/serial/fsl_lpuart.c:2868:6: note: Assuming field 'suspended' is 0 if (sport->port.suspended && !irq_wake) ^~~~~~~~~~~~~~~~~~~~~ drivers/tty/serial/fsl_lpuart.c:2868:28: note: Left side of '&&' is false if (sport->port.suspended && !irq_wake) ^ drivers/tty/serial/fsl_lpuart.c:2871:2: note: Taking false branch if (lpuart_is_32(sport)) ^ drivers/tty/serial/fsl_lpuart.c:2876:6: note: Assuming field 'lpuart_dma_rx_use' is true if (sport->lpuart_dma_rx_use) { ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/tty/serial/fsl_lpuart.c:2876:2: note: Taking true branch if (sport->lpuart_dma_rx_use) { ^ drivers/tty/serial/fsl_lpuart.c:2877:7: note: Assuming 'irq_wake' is true if (irq_wake) { ^~~~~~~~ drivers/tty/serial/fsl_lpuart.c:2877:3: note: Taking true branch if (irq_wake) { ^ drivers/tty/serial/fsl_lpuart.c:2878:9: note: Calling 'lpuart_start_rx_dma' if (!lpuart_start_rx_dma(sport)) ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/tty/serial/fsl_lpuart.c:1274:9: note: Assuming the condition is false bits = (termios->c_cflag & CSIZE) == CS7 ? 9 : 10; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/tty/serial/fsl_lpuart.c:1274:9: note: '?' condition is false drivers/tty/serial/fsl_lpuart.c:1275:6: note: Assuming the condition is false if (termios->c_cflag & PARENB) ^~~~~~~~~~~~~~~~~~~~~~~~~ drivers/tty/serial/fsl_lpuart.c:1275:2: note: Taking false branch if (termios->c_cflag & PARENB) ^ drivers/tty/serial/fsl_lpuart.c:1283:33: note: The result of the left shift is undefined because the right operand is negative sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1)); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 5 warnings generated. drivers/tty/mxser.c:396:7: warning: Although the value stored to 'hwid' is used in the enclosing expression, the value is never actually read from 'hwid' [clang-analyzer-deadcode.DeadStores] if ((hwid = inb(io + UART_MCR)) != 0) { ^ drivers/tty/mxser.c:396:7: note: Although the value stored to 'hwid' is used in the enclosing expression, the value is never actually read from 'hwid' int_cnt = 0; ^ ~ drivers/tty/mxser.c:1693:4: note: Value stored to 'int_cnt' is never read int_cnt = 0; ^ ~ Suppressed 3 warnings (2 in non-user code, 1 with check filters). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. drivers/leds/leds-pwm.c:146:15: warning: Access to field 'name' results in a dereference of a null pointer [clang-analyzer-core.NullDereference] led.name = to_of_node(fwnode)->name; ^ include/linux/of.h:161:2: note: expanded from macro 'to_of_node' ({ \ ^ drivers/leds/leds-pwm.c:180:6: note: Assuming 'count' is not equal to 0 if (!count) ^~~~~~ drivers/leds/leds-pwm.c:180:2: note: Taking false branch if (!count) ^ drivers/leds/leds-pwm.c:185:6: note: Assuming 'priv' is non-null if (!priv) ^~~~~ drivers/leds/leds-pwm.c:185:2: note: Taking false branch if (!priv) ^ drivers/leds/leds-pwm.c:188:8: note: Calling 'led_pwm_create_fwnode' ret = led_pwm_create_fwnode(&pdev->dev, priv); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/leds/leds-pwm.c:143:2: note: Loop condition is true. Entering loop body device_for_each_child_node(dev, fwnode) { ^ include/linux/property.h:112:2: note: expanded from macro 'device_for_each_child_node' for (child = device_get_next_child_node(dev, NULL); child; \ ^ drivers/leds/leds-pwm.c:145:7: note: Assuming 'ret' is not equal to 0 if (ret && is_of_node(fwnode)) ^~~ drivers/leds/leds-pwm.c:145:7: note: Left side of '&&' is true drivers/leds/leds-pwm.c:145:14: note: Assuming the condition is true if (ret && is_of_node(fwnode)) ^~~~~~~~~~~~~~~~~~ drivers/leds/leds-pwm.c:145:3: note: Taking true branch if (ret && is_of_node(fwnode)) ^ drivers/leds/leds-pwm.c:146:15: note: Assuming the condition is false led.name = to_of_node(fwnode)->name; ^ include/linux/of.h:164:3: note: expanded from macro 'to_of_node' is_of_node(__to_of_node_fwnode) ? \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/leds/leds-pwm.c:146:15: note: '?' condition is false led.name = to_of_node(fwnode)->name; ^ include/linux/of.h:164:3: note: expanded from macro 'to_of_node' is_of_node(__to_of_node_fwnode) ? \ ^ drivers/leds/leds-pwm.c:146:15: note: Access to field 'name' results in a dereference of a null pointer led.name = to_of_node(fwnode)->name; ^ include/linux/of.h:161:2: note: expanded from macro 'to_of_node' ({ \ ^ Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 5 warnings generated. drivers/ata/pata_pdc2027x.c:521:2: warning: Value stored to 'pll_ctl' is never read [clang-analyzer-deadcode.DeadStores] pll_ctl = ioread16(mmio_base + PDC_PLL_CTL); ^ drivers/ata/pata_pdc2027x.c:521:2: note: Value stored to 'pll_ctl' is never read drivers/ata/pata_pdc2027x.c:570:2: warning: Value stored to 'pll_ctl' is never read [clang-analyzer-deadcode.DeadStores] pll_ctl = ioread16(mmio_base + PDC_PLL_CTL); ^ drivers/ata/pata_pdc2027x.c:570:2: note: Value stored to 'pll_ctl' is never read Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 5 warnings generated. drivers/ata/pata_sis.c:417:6: warning: Value stored to 'speed' during its initialization is never read [clang-analyzer-deadcode.DeadStores] int speed = adev->dma_mode - XFER_MW_DMA_0; vim +/mxser_ops +1745 drivers/tty/mxser.c 1612 1613 static bool mxser_port_isr(struct mxser_port *port) 1614 { 1615 struct uart_port *uport = &port->uport; 1616 struct tty_struct *tty; 1617 u8 iir, status; 1618 bool error = false; 1619 1620 iir = inb(uport->iobase + UART_IIR); 1621 if (iir & UART_IIR_NO_INT) 1622 return true; 1623 1624 iir &= MOXA_MUST_IIR_MASK; 1625 tty = tty_port_tty_get(&port->port); 1626 if (!tty) { 1627 status = inb(uport->iobase + UART_LSR); 1628 outb(port->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT, 1629 uport->iobase + UART_FCR); 1630 inb(uport->iobase + UART_MSR); 1631 1632 error = true; 1633 goto put_tty; 1634 } 1635 1636 status = inb(uport->iobase + UART_LSR); 1637 1638 if (port->board->must_hwid) { 1639 if (iir == MOXA_MUST_IIR_GDA || 1640 iir == MOXA_MUST_IIR_RDA || 1641 iir == MOXA_MUST_IIR_RTO || 1642 iir == MOXA_MUST_IIR_LSR) 1643 status = mxser_receive_chars(tty, port, status); 1644 } else { 1645 status &= uport->read_status_mask; 1646 if (status & UART_LSR_DR) 1647 status = mxser_receive_chars(tty, port, status); 1648 } 1649 1650 mxser_check_modem_status(tty, port); 1651 1652 if (port->board->must_hwid) { 1653 if (iir == 0x02 && (status & UART_LSR_THRE)) 1654 mxser_transmit_chars(tty, port); 1655 } else { 1656 if (status & UART_LSR_THRE) 1657 mxser_transmit_chars(tty, port); 1658 } 1659 1660 put_tty: 1661 tty_kref_put(tty); 1662 1663 return error; 1664 } 1665 #endif 1666 /* 1667 * This is the serial driver's generic interrupt routine 1668 */ 1669 static irqreturn_t mxser_interrupt(int irq, void *dev_id) 1670 { 1671 struct mxser_board *brd = dev_id; 1672 struct mxser_port *port; 1673 struct uart_port *uport; 1674 unsigned int int_cnt, pass_counter = 0; 1675 unsigned int i, max = brd->nports; 1676 int handled = IRQ_NONE; 1677 u8 irqbits, bits, mask = BIT(max) - 1; 1678 1679 while (pass_counter++ < MXSER_ISR_PASS_LIMIT) { 1680 irqbits = inb(brd->vector) & mask; 1681 if (irqbits == mask) 1682 break; 1683 1684 handled = IRQ_HANDLED; 1685 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) { 1686 if (irqbits == mask) 1687 break; 1688 if (bits & irqbits) 1689 continue; 1690 port = &brd->ports[i]; 1691 uport = &port->uport; 1692 1694 spin_lock(&uport->lock); 1695 do { 1696 //if (mxser_port_isr(port)) 1697 break; 1698 } while (int_cnt++ < MXSER_ISR_PASS_LIMIT); 1699 spin_unlock(&uport->lock); 1700 } 1701 } 1702 1703 return handled; 1704 } 1705 #ifdef OLD 1706 static const struct tty_operations mxser_ops = { 1707 .open = mxser_open, 1708 .close = mxser_close, 1709 .write = mxser_write, 1710 .put_char = mxser_put_char, 1711 .flush_chars = mxser_flush_chars, 1712 .write_room = mxser_write_room, 1713 .chars_in_buffer = mxser_chars_in_buffer, 1714 .flush_buffer = mxser_flush_buffer, 1715 .ioctl = mxser_ioctl, 1716 .throttle = mxser_throttle, 1717 .unthrottle = mxser_unthrottle, 1718 .set_termios = mxser_set_termios, 1719 .stop = mxser_stop, 1720 .start = mxser_start, 1721 .hangup = mxser_hangup, 1722 .break_ctl = mxser_rs_break, 1723 .wait_until_sent = mxser_wait_until_sent, 1724 .tiocmget = mxser_tiocmget, 1725 .tiocmset = mxser_tiocmset, 1726 .set_serial = mxser_set_serial_info, 1727 .get_serial = mxser_get_serial_info, 1728 .get_icount = mxser_get_icount, 1729 }; 1730 1731 static const struct tty_port_operations mxser_port_ops = { 1732 .carrier_raised = mxser_carrier_raised, 1733 .dtr_rts = mxser_dtr_rts, 1734 .activate = mxser_activate, 1735 .shutdown = mxser_shutdown_port, 1736 }; 1737 #endif 1738 1739 static struct uart_driver mxser_uart_driver = { 1740 .owner = THIS_MODULE, 1741 .dev_name = "ttyMI", 1742 .nr = MXSER_PORTS, 1743 }; 1744 1746 .tx_empty = mxser_tx_empty, 1747 //.get_mctrl = mxser_get_mctrl, 1748 //.set_mctrl = mxser_set_mctrl, 1749 .stop_tx = mxser_stop_tx, 1750 .start_tx = mxser_start_tx, 1751 .stop_rx = mxser_stop_rx, 1752 .break_ctl = mxser_break_ctl, 1753 .startup = mxser_startup, 1754 .shutdown = mxser_shutdown, 1755 .set_termios = mxser_set_termios, 1756 //.pm = mxser_pm, 1757 //.type = mxser_type, 1758 //.release_port = mxser_release_port, 1759 //.request_port = mxser_request_port, 1760 //.config_port = mxser_config_port, 1761 //.verify_port = mxser_verify_port, 1762 }; 1763 1764 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org