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authorVille Syrjälä <ville.syrjala@linux.intel.com>2016-05-26 15:16:25 -0700
committerSasha Levin <sasha.levin@oracle.com>2016-06-06 19:11:13 -0400
commite3b5360919a2491a6ed34426a083f4afdcbc7973 (patch)
tree18ef68bad6163409e01a85bee421ba6c4360f559
parent20f38c9653aac20261fe13cfe410627680161c47 (diff)
downloadlinux-linaro-stable-e3b5360919a2491a6ed34426a083f4afdcbc7973.tar.gz
dma-debug: avoid spinlock recursion when disabling dma-debug
[ Upstream commit 3017cd63f26fc655d56875aaf497153ba60e9edf ] 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> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
-rw-r--r--lib/dma-debug.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 1ff0fd098504..c83ac43418be 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -646,9 +646,9 @@ 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;
}