diff options
| author | Takao Indoh <indou.takao@jp.fujitsu.com> | 2014-10-06 21:17:53 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-07 19:22:32 +0200 |
| commit | 567eded965e589df25ebc26e3041a0a4aba4cf42 (patch) | |
| tree | fbc060bc7afc7f226469ba8611d4c64f517897c2 /drivers/char | |
| parent | ipmi: work around gcc-4.9 build warning (diff) | |
| download | linux-567eded965e589df25ebc26e3041a0a4aba4cf42.tar.xz linux-567eded965e589df25ebc26e3041a0a4aba4cf42.zip | |
ipmi: Clear drvdata when interface is removed
This patch fixes a bug on hotmod removing.
After ipmi interface is removed using hotmod, kernel panic occurs when
rmmod impi_si. For example, try this:
# echo "remove,"`cat /proc/ipmi/0/params` > \
/sys/module/ipmi_si/parameters/hotmod
# rmmod ipmi_si
Then, rmmod fails with the following messages.
------------[ cut here ]------------
WARNING: CPU: 12 PID: 10819 at /mnt/repos/linux/lib/list_debug.c:53 __list_del_entry+0x63/0xd0()
CPU: 12 PID: 10819 Comm: rmmod Not tainted 3.17.0-rc1 #19
Hardware name: FUJITSU-SV PRIMERGY BX920 S2/D3030, BIOS 080015 Rev.3D81.3030 02/10/2012
Call Trace:
dump_stack+0x45/0x56
warn_slowpath_common+0x7d/0xa0
warn_slowpath_fmt+0x4c/0x50
__list_del_entry+0x63/0xd0
list_del+0xd/0x30
cleanup_one_si+0x2a/0x230 [ipmi_si]
ipmi_pnp_remove+0x15/0x20 [ipmi_si]
pnp_device_remove+0x24/0x40
__device_release_driver+0x7f/0xf0
driver_detach+0xb0/0xc0
bus_remove_driver+0x55/0xd0
driver_unregister+0x2c/0x50
pnp_unregister_driver+0x12/0x20
cleanup_ipmi_si+0xbc/0xf0 [ipmi_si]
SyS_delete_module+0x132/0x1c0
system_call_fastpath+0x16/0x1b
---[ end trace 70b4377268f85c23 ]---
list_del in cleanup_one_si() fails because the smi_info is already
removed when hotmod removing.
When ipmi interface is removed by hotmod, smi_info is removed by
cleanup_one_si(), but is is still set in drvdata. Therefore when rmmod
ipmi_si, ipmi_pnp_remove tries to remove it again and fails.
By this patch, a pointer to smi_info in drvdata is cleared when hotmod
removing so that it will be not accessed when rmmod.
changelog:
v2:
- Clear drvdata in cleanup_one_si
- Change subject
v1:
https://lkml.org/lkml/2014/9/8/741
Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/ipmi/ipmi_si_intf.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c index 1c43f9ac0989..5c4e1f625bbb 100644 --- a/drivers/char/ipmi/ipmi_si_intf.c +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -3658,6 +3658,9 @@ static void cleanup_one_si(struct smi_info *to_clean) if (!to_clean) return; + if (to_clean->dev) + dev_set_drvdata(to_clean->dev, NULL); + list_del(&to_clean->link); /* Tell the driver that we are shutting down. */ |