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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:     Jia-Ju Bai <baijiaju1990@163.com>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 051/293] scsi: megaraid: Fix a sleep-in-atomic
 bug
Thread-Topic: [PATCH AUTOSEL for 4.9 051/293] scsi: megaraid: Fix a
 sleep-in-atomic bug
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Date:   Mon, 9 Apr 2018 00:23:29 +0000
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From: Jia-Ju Bai <baijiaju1990@163.com>

[ Upstream commit 896f6966fc815abe71f85fb26f0193875df8a035 ]

The driver may sleep under a spin lock, and the function call path is:
mraid_mm_attach_buf (acquire the lock by spin_lock_irqsave)
  pci_pool_alloc(GFP_KERNEL) --> may sleep

To fix it, the "GFP_KERNEL" is replaced with "GFP_ATOMIC".

[mkp: fixed whitespace]

Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/scsi/megaraid/megaraid_mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/megaraid/megaraid_mm.c b/drivers/scsi/megaraid/me=
garaid_mm.c
index 4cf9ed96414f..544d6f7e6138 100644
--- a/drivers/scsi/megaraid/megaraid_mm.c
+++ b/drivers/scsi/megaraid/megaraid_mm.c
@@ -574,7 +574,7 @@ mraid_mm_attach_buf(mraid_mmadp_t *adp, uioc_t *kioc, i=
nt xferlen)
=20
 	kioc->pool_index	=3D right_pool;
 	kioc->free_buf		=3D 1;
-	kioc->buf_vaddr 	=3D pci_pool_alloc(pool->handle, GFP_KERNEL,
+	kioc->buf_vaddr		=3D pci_pool_alloc(pool->handle, GFP_ATOMIC,
 							&kioc->buf_paddr);
 	spin_unlock_irqrestore(&pool->lock, flags);
=20
--=20
2.15.1