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author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2019-05-27 08:14:55 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 09:10:18 +0200 |
commit | fea9869ff4c2cc39d2e8e86868d6d47fdf543b36 (patch) | |
tree | daee47638365882a0bae22561f7b67078198ca94 /drivers/media/pci | |
parent | 717cba2f103a791ff33e7cdfac4841535a9d69e7 (diff) | |
download | linux-stable-fea9869ff4c2cc39d2e8e86868d6d47fdf543b36.tar.gz linux-stable-fea9869ff4c2cc39d2e8e86868d6d47fdf543b36.tar.bz2 linux-stable-fea9869ff4c2cc39d2e8e86868d6d47fdf543b36.zip |
media: saa7164: fix remove_proc_entry warning
[ Upstream commit 50710eeefbc1ed25375942aad0c4d1eb4af0f330 ]
if saa7164_proc_create() fails, saa7164_fini() will trigger a warning,
name 'saa7164'
WARNING: CPU: 1 PID: 6311 at fs/proc/generic.c:672 remove_proc_entry+0x1e8/0x3a0
? remove_proc_entry+0x1e8/0x3a0
? try_stop_module+0x7b/0x240
? proc_readdir+0x70/0x70
? rcu_read_lock_sched_held+0xd7/0x100
saa7164_fini+0x13/0x1f [saa7164]
__x64_sys_delete_module+0x30c/0x480
? __ia32_sys_delete_module+0x480/0x480
? __x64_sys_clock_gettime+0x11e/0x1c0
? __x64_sys_timer_create+0x1a0/0x1a0
? trace_hardirqs_off_caller+0x40/0x180
? do_syscall_64+0x18/0x450
do_syscall_64+0x9f/0x450
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Fix it by checking the return of proc_create_single() before
calling remove_proc_entry().
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil-cisco@xs4all.nl: use 0444 instead of S_IRUGO]
[hverkuil-cisco@xs4all.nl: use pr_info instead of KERN_INFO]
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/media/pci')
-rw-r--r-- | drivers/media/pci/saa7164/saa7164-core.c | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/drivers/media/pci/saa7164/saa7164-core.c b/drivers/media/pci/saa7164/saa7164-core.c index c594aff92e70..9ae04e18e6c6 100644 --- a/drivers/media/pci/saa7164/saa7164-core.c +++ b/drivers/media/pci/saa7164/saa7164-core.c @@ -1112,16 +1112,25 @@ static int saa7164_proc_show(struct seq_file *m, void *v) return 0; } +static struct proc_dir_entry *saa7164_pe; + static int saa7164_proc_create(void) { - struct proc_dir_entry *pe; - - pe = proc_create_single("saa7164", S_IRUGO, NULL, saa7164_proc_show); - if (!pe) + saa7164_pe = proc_create_single("saa7164", 0444, NULL, saa7164_proc_show); + if (!saa7164_pe) return -ENOMEM; return 0; } + +static void saa7164_proc_destroy(void) +{ + if (saa7164_pe) + remove_proc_entry("saa7164", NULL); +} +#else +static int saa7164_proc_create(void) { return 0; } +static void saa7164_proc_destroy(void) {} #endif static int saa7164_thread_function(void *data) @@ -1493,19 +1502,21 @@ static struct pci_driver saa7164_pci_driver = { static int __init saa7164_init(void) { - printk(KERN_INFO "saa7164 driver loaded\n"); + int ret = pci_register_driver(&saa7164_pci_driver); + + if (ret) + return ret; -#ifdef CONFIG_PROC_FS saa7164_proc_create(); -#endif - return pci_register_driver(&saa7164_pci_driver); + + pr_info("saa7164 driver loaded\n"); + + return 0; } static void __exit saa7164_fini(void) { -#ifdef CONFIG_PROC_FS - remove_proc_entry("saa7164", NULL); -#endif + saa7164_proc_destroy(); pci_unregister_driver(&saa7164_pci_driver); } |