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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2012-02-04 00:37:15 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-02-04 01:16:41 +0100 |
| commit | 92618184cb92c5b39d4d8573572d576f9ccb3c28 (patch) | |
| tree | c2cd2a7e360d6879ccc871df125a8de725949a53 /drivers/misc | |
| parent | mm/filemap_xip.c: fix race condition in xip_file_fault() (diff) | |
| download | linux-92618184cb92c5b39d4d8573572d576f9ccb3c28.tar.xz linux-92618184cb92c5b39d4d8573572d576f9ccb3c28.zip | |
lkdtm: avoid calling lkdtm_do_action() with spinlock held
lkdtm_do_action() may call sleeping functions like kmalloc(), so do not
call it with spin lock held.
Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <greg@kroah.com>
Reviewed-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/lkdtm.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c index 150cd7061b80..28adefe70f96 100644 --- a/drivers/misc/lkdtm.c +++ b/drivers/misc/lkdtm.c @@ -354,6 +354,7 @@ static void lkdtm_do_action(enum ctype which) static void lkdtm_handler(void) { unsigned long flags; + bool do_it = false; spin_lock_irqsave(&count_lock, flags); count--; @@ -361,10 +362,13 @@ static void lkdtm_handler(void) cp_name_to_str(cpoint), cp_type_to_str(cptype), count); if (count == 0) { - lkdtm_do_action(cptype); + do_it = true; count = cpoint_count; } spin_unlock_irqrestore(&count_lock, flags); + + if (do_it) + lkdtm_do_action(cptype); } static int lkdtm_register_cpoint(enum cname which) |