[PATCH] dma-debug: serialize locking in unmap path

[Joerg Roedel]

Impact: reduce maximum lockdepth to one

This patch reduces the maximum spin lock depth from two to one in the
dma-debug code.

Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
---
 lib/dma-debug.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 9a350b4..3bd8d1d 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -542,7 +542,8 @@ static void check_unmap(struct dma_debug_entry *ref)
 			   "to free DMA memory it has not allocated "
 			   "[device address=0x%016llx] [size=%llu bytes]\n",
 			   ref->dev_addr, ref->size);
-		goto out;
+		put_hash_bucket(bucket, &flags);
+		return;
 	}
 
 	if (ref->size != entry->size) {
@@ -593,10 +594,8 @@ static void check_unmap(struct dma_debug_entry *ref)
 	}
 
 	hash_bucket_del(entry);
-	dma_entry_free(entry);
-
-out:
 	put_hash_bucket(bucket, &flags);
+	dma_entry_free(entry);
 }
 
 static void check_for_stack(struct device *dev, void *addr)
-- 
1.5.6.4


-- 
           | Advanced Micro Devices GmbH
 Operating | Karl-Hammerschmidt-Str. 34, 85609 Dornach bei München
 System    | 
 Research  | Geschäftsführer: Jochen Polster, Thomas M. McCoy, Giuliano Meroni
 Center    | Sitz: Dornach, Gemeinde Aschheim, Landkreis München
           | Registergericht München, HRB Nr. 43632

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/