dma-debug: avoid spinlock recursion when disabling dma-debug
authorVille Syrjälä <ville.syrjala@linux.intel.com>
Thu, 26 May 2016 22:16:25 +0000 (15:16 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 26 May 2016 22:35:44 +0000 (15:35 -0700)
commit3017cd63f26fc655d56875aaf497153ba60e9edf
treeca4768c5cf6ac13344bc289c66a7f1e2bcdba3c5
parent7ef949d77f95f0d129f0d404b336459a34a00101
dma-debug: avoid spinlock recursion when disabling dma-debug

With netconsole (at least) the pr_err("...  disablingn") call can
recurse back into the dma-debug code, where it'll try to grab
free_entries_lock again.  Avoid the problem by doing the printk after
dropping the lock.

Link: http://lkml.kernel.org/r/1463678421-18683-1-git-send-email-ville.syrjala@linux.intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/dma-debug.c