linux-kernel - [PATCH] IB/sa: replace GFP_KERNEL with GFP

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Message-Id: <1445960860-3396-1-git-send-email-saurabh.truth@gmail.com>
Date:	Tue, 27 Oct 2015 21:17:40 +0530
From:	Saurabh Sengar <saurabh.truth@...il.com>
To:	dledford@...hat.com, sean.hefty@...el.com,
	hal.rosenstock@...il.com, ira.weiny@...el.com,
	jgunthorpe@...idianresearch.com, yun.wang@...fitbricks.com,
	kaike.wan@...el.com, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Saurabh Sengar <saurabh.truth@...il.com>
Subject: [PATCH] IB/sa: replace GFP_KERNEL with GFP_ATOMIC

replace GFP_KERNEL with GFP_ATOMIC, as code while holding a spinlock
should be atomic
GFP_KERNEL may sleep and can cause deadlock, where as GFP_ATOMIC may
fail but certainly avoids deadlock

Signed-off-by: Saurabh Sengar <saurabh.truth@...il.com>
---
 drivers/infiniband/core/sa_query.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c
index 8c014b3..cd1f911 100644
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -526,7 +526,7 @@ static int ib_nl_send_msg(struct ib_sa_query *query)
 	if (len <= 0)
 		return -EMSGSIZE;
 
-	skb = nlmsg_new(len, GFP_KERNEL);
+	skb = nlmsg_new(len, GFP_ATOMIC);
 	if (!skb)
 		return -ENOMEM;
 
@@ -544,7 +544,7 @@ static int ib_nl_send_msg(struct ib_sa_query *query)
 	/* Repair the nlmsg header length */
 	nlmsg_end(skb, nlh);
 
-	ret = ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, GFP_KERNEL);
+	ret = ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, GFP_ATOMIC);
 	if (!ret)
 		ret = len;
 	else
-- 
1.9.1

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