* [PATCH] mips: kernel: use DEFINE_DEBUGFS_ATTRIBUTE with debugfs_create_file_unsafe()
@ 2021-03-13 3:33 Wang Qing
2021-03-14 13:10 ` Thomas Bogendoerfer
0 siblings, 1 reply; 2+ messages in thread
From: Wang Qing @ 2021-03-13 3:33 UTC (permalink / raw)
To: Thomas Bogendoerfer, Wang Qing, linux-mips, linux-kernel
debugfs_create_file_unsafe does not protect the fops handed to it
against file removal. DEFINE_DEBUGFS_ATTRIBUTE makes the fops aware of
the file lifetime and thus protects it against removal.
Signed-off-by: Wang Qing <wangqing@vivo.com>
---
arch/mips/kernel/spinlock_test.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/mips/kernel/spinlock_test.c b/arch/mips/kernel/spinlock_test.c
index ab4e3e1..90f53e0
--- a/arch/mips/kernel/spinlock_test.c
+++ b/arch/mips/kernel/spinlock_test.c
@@ -35,7 +35,7 @@ static int ss_get(void *data, u64 *val)
return 0;
}
-DEFINE_SIMPLE_ATTRIBUTE(fops_ss, ss_get, NULL, "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(fops_ss, ss_get, NULL, "%llu\n");
@@ -114,13 +114,13 @@ static int multi_get(void *data, u64 *val)
return 0;
}
-DEFINE_SIMPLE_ATTRIBUTE(fops_multi, multi_get, NULL, "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(fops_multi, multi_get, NULL, "%llu\n");
static int __init spinlock_test(void)
{
- debugfs_create_file("spin_single", S_IRUGO, mips_debugfs_dir, NULL,
+ debugfs_create_file_unsafe("spin_single", S_IRUGO, mips_debugfs_dir, NULL,
&fops_ss);
- debugfs_create_file("spin_multi", S_IRUGO, mips_debugfs_dir, NULL,
+ debugfs_create_file_unsafe("spin_multi", S_IRUGO, mips_debugfs_dir, NULL,
&fops_multi);
return 0;
}
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] mips: kernel: use DEFINE_DEBUGFS_ATTRIBUTE with debugfs_create_file_unsafe()
2021-03-13 3:33 [PATCH] mips: kernel: use DEFINE_DEBUGFS_ATTRIBUTE with debugfs_create_file_unsafe() Wang Qing
@ 2021-03-14 13:10 ` Thomas Bogendoerfer
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Bogendoerfer @ 2021-03-14 13:10 UTC (permalink / raw)
To: Wang Qing; +Cc: linux-mips, linux-kernel
On Sat, Mar 13, 2021 at 11:33:48AM +0800, Wang Qing wrote:
> debugfs_create_file_unsafe does not protect the fops handed to it
> against file removal. DEFINE_DEBUGFS_ATTRIBUTE makes the fops aware of
> the file lifetime and thus protects it against removal.
>
> Signed-off-by: Wang Qing <wangqing@vivo.com>
> ---
> arch/mips/kernel/spinlock_test.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
applied to mips-next.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
^ permalink raw reply [flat|nested] 2+ messages in thread
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