From: Ville Syrjälä <ville.syrj...@linux.intel.com>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
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.syrj...@linux.intel.com
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Jiri Slaby <jsl...@suse.cz>
---
lib/dma-debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index eb43517bf261..c32437f6be61 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -445,9 +445,9 @@ 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;
}
--
2.9.0
