6:35 a.m.
Linus Walleij <linus.walleij(a)linaro.org> writes:
On Mon, Feb 15, 2016 at 3:39 AM, Huang, Ying
<ying.huang(a)intel.com> wrote:
> Michael Welling <mwelling(a)ieee.org> writes:
>> Could you run cat /proc/devices?
>
> Sorry, the test mechanism is not flexible enough to run some shell
> command in test system. Could you provide a specialized debug kernel to
> dump the necessary information in kernel log? We can collect dmesg
> easily.
Can you try this:
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 24b142569ca9..74a2d433273e 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -96,6 +96,8 @@ __register_chrdev_region(unsigned int major,
unsigned int baseminor,
goto out;
}
major = i;
+ pr_info("CHARDEV: allocate major %d for \"%s\"\n",
+ i, name);
}
cd->major = major;
Then dmesg |grep CHARDEV should tell what we need to know.
Sorry for late, the dmesg with the patch is attached. And the output of
dmesg | grep CHARDEV is as follow:
[ 0.750037] CHARDEV: allocate major 254 for "gpiochip"
[ 0.897928] CHARDEV: allocate major 253 for "tpm"
[ 0.904196] CHARDEV: allocate major 252 for "ndctl"
[ 0.905295] CHARDEV: allocate major 251 for "dimmctl"
[ 0.909573] CHARDEV: allocate major 250 for "pps"
[ 0.913740] CHARDEV: allocate major 249 for "ptp"
[ 0.916711] CHARDEV: allocate major 248 for "iio"
[ 1.227597] CHARDEV: allocate major 247 for "bsg"
[ 1.577194] CHARDEV: allocate major 246 for "gsmtty"
[ 1.614921] CHARDEV: allocate major 245 for "ttyn"
[ 1.616044] CHARDEV: allocate major 244 for "ttyARC"
[ 1.617177] CHARDEV: allocate major 243 for "ttyRP"
[ 1.618310] CHARDEV: allocate major 242 for "ttyLP"
[ 1.620618] CHARDEV: allocate major 241 for "noz"
[ 1.621707] CHARDEV: allocate major 240 for "ttyIPWp"
[ 1.630024] CHARDEV: allocate major 239 for "telco_clock"
[ 1.632315] CHARDEV: allocate major 239 for "cmm"
[ 1.681375] CHARDEV: allocate major 238 for "hpilo"
[ 1.696757] CHARDEV: allocate major 237 for "aac"
[ 1.699338] CHARDEV: allocate major 236 for "megadev_legacy"
[ 1.704680] CHARDEV: allocate major 235 for "megaraid_sas_ioctl"
[ 1.731179] CHARDEV: allocate major 234 for "pmcsas"
[ 1.737520] CHARDEV: allocate major 233 for "nvme"
[ 2.388531] CHARDEV: allocate major 232 for "firewire"
[ 2.389743] CHARDEV: allocate major 231 for "uio"
[ 2.904429] CHARDEV: allocate major 230 for "ttySDIO"
[ 2.922374] CHARDEV: allocate major 229 for "ib_qib"
[ 2.927559] CHARDEV: allocate major 228 for "hidraw"
[ 2.952328] CHARDEV: allocate major 227 for "fwtty"
[ 2.953435] CHARDEV: allocate major 225 for "fwloop"
Best Regards,
Huang, Ying