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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2016-05-27 01:16:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-08 04:14:37 +0300 |
| commit | 7d0b494532b703da654f96389804f491a6594bbb (patch) | |
| tree | 3f45f831ae6a3cfb80fe86f620b0c4d267904968 /lib/dma-debug.c | |
| parent | 98c28450538d0a191d031cce8852e568b62a1127 (diff) | |
| download | linux-7d0b494532b703da654f96389804f491a6594bbb.tar.xz | |
dma-debug: avoid spinlock recursion when disabling dma-debug
commit 3017cd63f26fc655d56875aaf497153ba60e9edf upstream.
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/dma-debug.c')
| -rw-r--r-- | lib/dma-debug.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c index 4a1515f4b452..51a76af25c66 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -657,9 +657,9 @@ static struct dma_debug_entry *dma_entry_alloc(void) spin_lock_irqsave(&free_entries_lock, flags); if (list_empty(&free_entries)) { - pr_err("DMA-API: debugging out of memory - disabling\n"); global_disable = true; spin_unlock_irqrestore(&free_entries_lock, flags); + pr_err("DMA-API: debugging out of memory - disabling\n"); return NULL; } |