From 7f8306429c4c75f9e2bf39fcfe990b0af2f7292d Mon Sep 17 00:00:00 2001
From: Robin Murphy <robin.murphy@arm.com>
Date: Fri, 6 Nov 2015 16:32:55 -0800
Subject: [PATCH] dma-debug: check nents in dma_sync_sg*
Like dma_unmap_sg, dma_sync_sg* should be called with the original number
of entries passed to dma_map_sg, so do the same check in the sync path as
we do in the unmap path.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Sakari Ailus <sakari.ailus@iki.fi>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
lib/dma-debug.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index fcb65d2a0b947..8855f019ebe8a 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -1249,6 +1249,14 @@ static void check_sync(struct device *dev,
dir2name[entry->direction],
dir2name[ref->direction]);
+ if (ref->sg_call_ents && ref->type == dma_debug_sg &&
+ ref->sg_call_ents != entry->sg_call_ents) {
+ err_printk(ref->dev, entry, "DMA-API: device driver syncs "
+ "DMA sg list with different entry count "
+ "[map count=%d] [sync count=%d]\n",
+ entry->sg_call_ents, ref->sg_call_ents);
+ }
+
out:
put_hash_bucket(bucket, &flags);
}
--
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