diff options
| author | Ville Syrjälä <[email protected]> | 2016-05-26 22:16:25 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2016-05-26 22:35:44 +0000 |
| commit | 3017cd63f26fc655d56875aaf497153ba60e9edf (patch) | |
| tree | ca4768c5cf6ac13344bc289c66a7f1e2bcdba3c5 /lib/dma-debug.c | |
| parent | mm: oom_reaper: remove some bloat (diff) | |
| download | kernel-3017cd63f26fc655d56875aaf497153ba60e9edf.tar.gz kernel-3017cd63f26fc655d56875aaf497153ba60e9edf.zip | |
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/[email protected]
Signed-off-by: Ville Syrjälä <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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; } |