Commit a7a2c02a authored Apr 16, 2015 by Sebastian Ott Committed by Linus Torvalds Apr 17, 2015

lib/dma-debug: fix bucket_find_contain()



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>

parent 7c43d9a3

lib/dma-debug.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;

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