3:03 a.m.
url:
https://github.com/0day-ci/linux/commits/eli-billauer-gmail-com/Submissio...
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
080951f99de1e483a9a48f34c079b634f2912a54
config: x86_64-randconfig-m001-20210309 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com>
smatch warnings:
drivers/char/xillybus/xillybus_class.c:86 xillybus_init_chrdev() warn: ignoring
unreachable code.
drivers/char/xillybus/xillybus_class.c:96 xillybus_init_chrdev() warn: missing error code
'rc'
vim +86 drivers/char/xillybus/xillybus_class.c
10702b71f93292 Eli Billauer 2021-03-09 42 int xillybus_init_chrdev(struct device *dev,
10702b71f93292 Eli Billauer 2021-03-09 43 const struct file_operations *fops,
10702b71f93292 Eli Billauer 2021-03-09 44 struct module *owner,
10702b71f93292 Eli Billauer 2021-03-09 45 void *private_data,
10702b71f93292 Eli Billauer 2021-03-09 46 unsigned char *idt, unsigned int len,
10702b71f93292 Eli Billauer 2021-03-09 47 int num_nodes,
10702b71f93292 Eli Billauer 2021-03-09 48 const char *prefix, bool enumerate)
10702b71f93292 Eli Billauer 2021-03-09 49 {
10702b71f93292 Eli Billauer 2021-03-09 50 int rc;
10702b71f93292 Eli Billauer 2021-03-09 51 dev_t mdev;
10702b71f93292 Eli Billauer 2021-03-09 52 int i;
10702b71f93292 Eli Billauer 2021-03-09 53 char devname[48];
10702b71f93292 Eli Billauer 2021-03-09 54
10702b71f93292 Eli Billauer 2021-03-09 55 struct device *device;
10702b71f93292 Eli Billauer 2021-03-09 56 size_t namelen;
10702b71f93292 Eli Billauer 2021-03-09 57 struct xilly_unit *unit, *u;
10702b71f93292 Eli Billauer 2021-03-09 58
10702b71f93292 Eli Billauer 2021-03-09 59 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
10702b71f93292 Eli Billauer 2021-03-09 60
10702b71f93292 Eli Billauer 2021-03-09 61 if (!unit)
10702b71f93292 Eli Billauer 2021-03-09 62 return -ENOMEM;
10702b71f93292 Eli Billauer 2021-03-09 63
10702b71f93292 Eli Billauer 2021-03-09 64 mutex_lock(&unit_mutex);
10702b71f93292 Eli Billauer 2021-03-09 65
10702b71f93292 Eli Billauer 2021-03-09 66 if (!enumerate)
10702b71f93292 Eli Billauer 2021-03-09 67 snprintf(unit->name, UNITNAMELEN,
"%s", prefix);
10702b71f93292 Eli Billauer 2021-03-09 68
10702b71f93292 Eli Billauer 2021-03-09 69 for (i = 0; enumerate; i++) {
10702b71f93292 Eli Billauer 2021-03-09 70 snprintf(unit->name, UNITNAMELEN,
"%s_%02d",
10702b71f93292 Eli Billauer 2021-03-09 71 prefix, i);
10702b71f93292 Eli Billauer 2021-03-09 72
10702b71f93292 Eli Billauer 2021-03-09 73 enumerate = false;
10702b71f93292 Eli Billauer 2021-03-09 74 list_for_each_entry(u, &unit_list,
list_entry)
10702b71f93292 Eli Billauer 2021-03-09 75 if (!strcmp(unit->name, u->name)) {
10702b71f93292 Eli Billauer 2021-03-09 76 enumerate = true;
10702b71f93292 Eli Billauer 2021-03-09 77 break;
10702b71f93292 Eli Billauer 2021-03-09 78 }
10702b71f93292 Eli Billauer 2021-03-09 79 }
10702b71f93292 Eli Billauer 2021-03-09 80
10702b71f93292 Eli Billauer 2021-03-09 81 rc = alloc_chrdev_region(&mdev, 0,
num_nodes, unit->name);
10702b71f93292 Eli Billauer 2021-03-09 82
10702b71f93292 Eli Billauer 2021-03-09 83 if (rc) {
10702b71f93292 Eli Billauer 2021-03-09 84 dev_warn(dev, "Failed to obtain
major/minors");
10702b71f93292 Eli Billauer 2021-03-09 85 goto fail_obtain;
^^^^^^^^^^^^^^^^^
10702b71f93292 Eli Billauer 2021-03-09 @86 return rc;
^^^^^^^^^^
Unreachable
10702b71f93292 Eli Billauer 2021-03-09 87 }
10702b71f93292 Eli Billauer 2021-03-09 88
10702b71f93292 Eli Billauer 2021-03-09 89 unit->major = MAJOR(mdev);
10702b71f93292 Eli Billauer 2021-03-09 90 unit->lowest_minor = MINOR(mdev);
10702b71f93292 Eli Billauer 2021-03-09 91 unit->num_nodes = num_nodes;
10702b71f93292 Eli Billauer 2021-03-09 92 unit->private_data = private_data;
10702b71f93292 Eli Billauer 2021-03-09 93
10702b71f93292 Eli Billauer 2021-03-09 94 unit->cdev = cdev_alloc();
10702b71f93292 Eli Billauer 2021-03-09 95 if (!unit->cdev)
10702b71f93292 Eli Billauer 2021-03-09 @96 goto unregister_chrdev;
"rc = -ENOMEM;"
10702b71f93292 Eli Billauer 2021-03-09 97
10702b71f93292 Eli Billauer 2021-03-09 98 unit->cdev->ops = fops;
10702b71f93292 Eli Billauer 2021-03-09 99 unit->cdev->owner = owner;
10702b71f93292 Eli Billauer 2021-03-09 100
10702b71f93292 Eli Billauer 2021-03-09 101 rc = cdev_add(unit->cdev,
MKDEV(unit->major, unit->lowest_minor),
10702b71f93292 Eli Billauer 2021-03-09 102 unit->num_nodes);
10702b71f93292 Eli Billauer 2021-03-09 103 if (rc) {
10702b71f93292 Eli Billauer 2021-03-09 104 dev_err(dev, "Failed to add
cdev.\n");
10702b71f93292 Eli Billauer 2021-03-09 105 /* kobject_put() is normally done by
cdev_del() */
10702b71f93292 Eli Billauer 2021-03-09 106 kobject_put(&unit->cdev->kobj);
10702b71f93292 Eli Billauer 2021-03-09 107 goto unregister_chrdev;
10702b71f93292 Eli Billauer 2021-03-09 108 }
10702b71f93292 Eli Billauer 2021-03-09 109
10702b71f93292 Eli Billauer 2021-03-09 110 for (i = 0; i < num_nodes; i++) {
10702b71f93292 Eli Billauer 2021-03-09 111 namelen = strnlen(idt, len);
10702b71f93292 Eli Billauer 2021-03-09 112
10702b71f93292 Eli Billauer 2021-03-09 113 if (namelen == len) {
10702b71f93292 Eli Billauer 2021-03-09 114 dev_err(dev, "IDT's list of names
is too short. This is exceptionally weird, because its CRC is OK\n");
10702b71f93292 Eli Billauer 2021-03-09 115 rc = -ENODEV;
10702b71f93292 Eli Billauer 2021-03-09 116 goto unroll_device_create;
10702b71f93292 Eli Billauer 2021-03-09 117 }
10702b71f93292 Eli Billauer 2021-03-09 118
10702b71f93292 Eli Billauer 2021-03-09 119 snprintf(devname, sizeof(devname),
"%s_%s",
10702b71f93292 Eli Billauer 2021-03-09 120 unit->name, idt);
10702b71f93292 Eli Billauer 2021-03-09 121
10702b71f93292 Eli Billauer 2021-03-09 122 len -= namelen + 1;
10702b71f93292 Eli Billauer 2021-03-09 123 idt += namelen + 1;
10702b71f93292 Eli Billauer 2021-03-09 124
10702b71f93292 Eli Billauer 2021-03-09 125 device = device_create(xillybus_class,
10702b71f93292 Eli Billauer 2021-03-09 126 NULL,
10702b71f93292 Eli Billauer 2021-03-09 127 MKDEV(unit->major,
10702b71f93292 Eli Billauer 2021-03-09 128 i + unit->lowest_minor),
10702b71f93292 Eli Billauer 2021-03-09 129 NULL,
10702b71f93292 Eli Billauer 2021-03-09 130 "%s", devname);
10702b71f93292 Eli Billauer 2021-03-09 131
10702b71f93292 Eli Billauer 2021-03-09 132 if (IS_ERR(device)) {
10702b71f93292 Eli Billauer 2021-03-09 133 dev_err(dev, "Failed to create %s
device. Aborting.\n",
10702b71f93292 Eli Billauer 2021-03-09 134 devname);
10702b71f93292 Eli Billauer 2021-03-09 135 rc = -ENODEV;
10702b71f93292 Eli Billauer 2021-03-09 136 goto unroll_device_create;
10702b71f93292 Eli Billauer 2021-03-09 137 }
10702b71f93292 Eli Billauer 2021-03-09 138 }
10702b71f93292 Eli Billauer 2021-03-09 139
10702b71f93292 Eli Billauer 2021-03-09 140 if (len) {
10702b71f93292 Eli Billauer 2021-03-09 141 dev_err(dev, "IDT's list of names
is too long. This is exceptionally weird, because its CRC is OK\n");
10702b71f93292 Eli Billauer 2021-03-09 142 rc = -ENODEV;
10702b71f93292 Eli Billauer 2021-03-09 143 goto unroll_device_create;
10702b71f93292 Eli Billauer 2021-03-09 144 }
10702b71f93292 Eli Billauer 2021-03-09 145
10702b71f93292 Eli Billauer 2021-03-09 146 list_add_tail(&unit->list_entry,
&unit_list);
10702b71f93292 Eli Billauer 2021-03-09 147
10702b71f93292 Eli Billauer 2021-03-09 148 dev_info(dev, "Created %d device
files.\n", num_nodes);
10702b71f93292 Eli Billauer 2021-03-09 149
10702b71f93292 Eli Billauer 2021-03-09 150 mutex_unlock(&unit_mutex);
10702b71f93292 Eli Billauer 2021-03-09 151
10702b71f93292 Eli Billauer 2021-03-09 152 return 0;
10702b71f93292 Eli Billauer 2021-03-09 153
10702b71f93292 Eli Billauer 2021-03-09 154 unroll_device_create:
10702b71f93292 Eli Billauer 2021-03-09 155 for (i--; i >= 0; i--)
10702b71f93292 Eli Billauer 2021-03-09 156 device_destroy(xillybus_class,
MKDEV(unit->major,
10702b71f93292 Eli Billauer 2021-03-09 157 i + unit->lowest_minor));
10702b71f93292 Eli Billauer 2021-03-09 158
10702b71f93292 Eli Billauer 2021-03-09 159 cdev_del(unit->cdev);
10702b71f93292 Eli Billauer 2021-03-09 160
10702b71f93292 Eli Billauer 2021-03-09 161 unregister_chrdev:
10702b71f93292 Eli Billauer 2021-03-09 162
unregister_chrdev_region(MKDEV(unit->major, unit->lowest_minor),
10702b71f93292 Eli Billauer 2021-03-09 163 unit->num_nodes);
10702b71f93292 Eli Billauer 2021-03-09 164
10702b71f93292 Eli Billauer 2021-03-09 165 fail_obtain:
10702b71f93292 Eli Billauer 2021-03-09 166 mutex_unlock(&unit_mutex);
10702b71f93292 Eli Billauer 2021-03-09 167
10702b71f93292 Eli Billauer 2021-03-09 168 kfree(unit);
10702b71f93292 Eli Billauer 2021-03-09 169
10702b71f93292 Eli Billauer 2021-03-09 170 return rc;
10702b71f93292 Eli Billauer 2021-03-09 171 }
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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