[PATCH AUTOSEL 4.18 004/136] misc: ibmvmc: Use GFP_ATOMIC under spin lock

[Sasha Levin]

From: Wei Yongjun <weiyongjun1@xxxxxxxxxx>

[ Upstream commit 97b715b62e5b4c6edb75d023f556fd09a46cb4e1 ]

The function alloc_dma_buffer() is called from ibmvmc_add_buffer(),
in which a spin lock be held here, so we should use GFP_ATOMIC when
a lock is held.

Fixes: 0eca353e7ae7 ("misc: IBM Virtual Management Channel Driver (VMC)")
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
Reviewed-by: Bryant G. Ly <bryantly@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
 drivers/misc/ibmvmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/ibmvmc.c b/drivers/misc/ibmvmc.c
index fb83d1375638..8f82bb9d11e2 100644
--- a/drivers/misc/ibmvmc.c
+++ b/drivers/misc/ibmvmc.c
@@ -273,7 +273,7 @@ static void *alloc_dma_buffer(struct vio_dev *vdev, size_t size,
 			      dma_addr_t *dma_handle)
 {
 	/* allocate memory */
-	void *buffer = kzalloc(size, GFP_KERNEL);
+	void *buffer = kzalloc(size, GFP_ATOMIC);
 
 	if (!buffer) {
 		*dma_handle = 0;
-- 
2.17.1