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From:   Wei Yongjun <weiyongjun1@huawei.com>
To:     "Bryant G. Ly" <bryantly@linux.vnet.ibm.com>,
        Steven Royer <seroyer@linux.vnet.ibm.com>,
        Arnd Bergmann <arnd@arndb.de>,
        "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
CC:     Wei Yongjun <weiyongjun1@huawei.com>,
        <linux-kernel@vger.kernel.org>, <kernel-janitors@vger.kernel.org>
Subject: [PATCH -next] misc: ibmvmc: Use GFP_ATOMIC under spin lock
Date:   Sat, 26 May 2018 09:45:59 +0000
Message-ID: <1527327959-83701-1-git-send-email-weiyongjun1@huawei.com>
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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>
---
 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 fb83d13..8f82bb9 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;