linux-kernel - [PATCH] megaraid: Fix a sleep-in-atomic bug

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Date:   Wed, 31 May 2017 10:56:56 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     kashyap.desai@...adcom.com, sumit.saxena@...adcom.com,
        shivasharan.srikanteshwara@...adcom.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@....com>
Subject: [PATCH] megaraid: Fix a sleep-in-atomic bug

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".

Signed-off-by: Jia-Ju Bai <baijiaju1990@....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/megaraid_mm.c
index 4cf9ed9..c43afb8 100644
--- a/drivers/scsi/megaraid/megaraid_mm.c
+++ b/drivers/scsi/megaraid/megaraid_mm.c
@@ -574,7 +574,7 @@
 
 	kioc->pool_index	= right_pool;
 	kioc->free_buf		= 1;
-	kioc->buf_vaddr 	= pci_pool_alloc(pool->handle, GFP_KERNEL,
+	kioc->buf_vaddr 	= pci_pool_alloc(pool->handle, GFP_ATOMIC,
 							&kioc->buf_paddr);
 	spin_unlock_irqrestore(&pool->lock, flags);
 
-- 
1.7.9.5