lib/dma-debug: fix bucket_find_contain()
authorSebastian Ott <sebott@linux.vnet.ibm.com>
Thu, 16 Apr 2015 19:43:25 +0000 (12:43 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 17 Apr 2015 13:03:54 +0000 (09:03 -0400)
bucket_find_contain() will search the bucket list for a dma_debug_entry.
When the entry isn't found it needs to search other buckets too, since
only the start address of a dma range is hashed (which might be in a
different bucket).

A copy of the dma_debug_entry is used to get the previous hash bucket
but when its list is searched the original dma_debug_entry is to be used
not its modified copy.

This fixes false "device driver tries to sync DMA memory it has not allocated"
warnings.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Horia Geanta <horia.geanta@freescale.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/dma-debug.c

index 9722bd2..ae4b65e 100644 (file)
@@ -361,7 +361,7 @@ static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
        unsigned int range = 0;
 
        while (range <= max_range) {
-               entry = __hash_bucket_find(*bucket, &index, containing_match);
+               entry = __hash_bucket_find(*bucket, ref, containing_match);
 
                if (entry)
                        return entry;