From: Thierry Reding <treding@nvidia.com>
Date: Thu, 20 Dec 2018 16:35:47 +0000 (+0100)
Subject: dma-mapping: fix inverted logic in dma_supported
X-Git-Tag: v5.0-rc1~113^2
X-Git-Url: https://repo.jachan.dev/linux.git/commitdiff_plain/8b1cce9f5832a8eda17d37a3c49fb7dd2d650f46

dma-mapping: fix inverted logic in dma_supported

The cleanup in commit 356da6d0cde3 ("dma-mapping: bypass indirect calls
for dma-direct") accidentally inverted the logic in the check for the
presence of a ->dma_supported() callback. Switch this back to the way it
was to prevent a crash on boot.

Fixes: 356da6d0cde3 ("dma-mapping: bypass indirect calls for dma-direct")
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index fc84c81029d9..d7c34d2d1ba5 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -406,7 +406,7 @@ int dma_supported(struct device *dev, u64 mask)
 
 	if (dma_is_direct(ops))
 		return dma_direct_supported(dev, mask);
-	if (ops->dma_supported)
+	if (!ops->dma_supported)
 		return 1;
 	return ops->dma_supported(dev, mask);
 }