From: Wei Yongjun <weiyongjun1@huawei.com>
Date: Sat, 26 May 2018 09:45:59 +0000 (+0000)
Subject: misc: ibmvmc: Use GFP_ATOMIC under spin lock
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=97b715b62e5b4c6edb75d023f556fd09a46cb4e1;p=linux.git

misc: ibmvmc: Use GFP_ATOMIC under spin lock

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@huawei.com>
Reviewed-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/misc/ibmvmc.c b/drivers/misc/ibmvmc.c
index fb83d1375638e..8f82bb9d11e2e 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;