linux-kernel - [PATCH 4.18 004/228] misc: ibmvmc: Use GFP

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Date:   Tue,  2 Oct 2018 06:21:41 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wei Yongjun <weiyongjun1@...wei.com>,
        "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 004/228] misc: ibmvmc: Use GFP_ATOMIC under spin lock

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wei Yongjun <weiyongjun1@...wei.com>

[ 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@...wei.com>
Reviewed-by: Bryant G. Ly <bryantly@...ux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/misc/ibmvmc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/misc/ibmvmc.c
+++ b/drivers/misc/ibmvmc.c
@@ -273,7 +273,7 @@ static void *alloc_dma_buffer(struct vio
 			      dma_addr_t *dma_handle)
 {
 	/* allocate memory */
-	void *buffer = kzalloc(size, GFP_KERNEL);
+	void *buffer = kzalloc(size, GFP_ATOMIC);
 
 	if (!buffer) {
 		*dma_handle = 0;