[PATCH V2 1/4] exynos4-is: Free FIMC-IS CPU memory only when allocated

[Sylwester Nawrocki]

Ensure dma_free_coherent() is not called with incorrect arguments
and only when the memory was actually allocated. This will prevent
possible crashes on error paths of the top level media device driver,
when fimc-is device gets unregistered and its driver detached.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
 drivers/media/platform/exynos4-is/fimc-is.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/exynos4-is/fimc-is.c b/drivers/media/platform/exynos4-is/fimc-is.c
index 128b73b..5476dce 100644
--- a/drivers/media/platform/exynos4-is/fimc-is.c
+++ b/drivers/media/platform/exynos4-is/fimc-is.c
@@ -367,6 +367,9 @@ static void fimc_is_free_cpu_memory(struct fimc_is *is)
 {
 	struct device *dev = &is->pdev->dev;
 
+	if (is->memory.vaddr == NULL)
+		return;
+
 	dma_free_coherent(dev, is->memory.size, is->memory.vaddr,
 			  is->memory.paddr);
 }
-- 
1.7.9.5

--
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/