Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Wei Yongjun <weiyongjun1@huawei.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL 4.18 004/136] misc: ibmvmc: Use GFP_ATOMIC under spin
 lock
Thread-Topic: [PATCH AUTOSEL 4.18 004/136] misc: ibmvmc: Use GFP_ATOMIC under
 spin lock
Thread-Index: AQHUTjKNWJnEwc/ivkuXptovYTVuTQ==
Date:   Mon, 17 Sep 2018 03:00:13 +0000
Message-ID: <20180917030006.245495-4-alexander.levin@microsoft.com>
References: <20180917030006.245495-1-alexander.levin@microsoft.com>
In-Reply-To: <20180917030006.245495-1-alexander.levin@microsoft.com>
Accept-Language: en-US
Content-Language: en-US
received-spf: None (protection.outlook.com: microsoft.com does not designate
 permitted sender hosts)
spamdiagnosticoutput: 1:99
spamdiagnosticmetadata: NSPM
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-Network-Message-Id: b29b4b8b-9e7e-4126-6334-08d61c49b02c
X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Sep 2018 03:00:13.2455
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0134
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

From: Wei Yongjun <weiyongjun1@huawei.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@huawei.com>
Reviewed-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.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 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, siz=
e_t size,
 			      dma_addr_t *dma_handle)
 {
 	/* allocate memory */
-	void *buffer =3D kzalloc(size, GFP_KERNEL);
+	void *buffer =3D kzalloc(size, GFP_ATOMIC);
=20
 	if (!buffer) {
 		*dma_handle =3D 0;
--=20
2.17.1