linux-kernel - [PATCH 3.19.y-ckt 018/251] sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in softirq context

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Message-Id: <1437008972-9140-19-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:05:39 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sowmini Varadhan <sowmini.varadhan@...cle.com>,
	David Miller <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 018/251] sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in softirq context

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

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

From: Sowmini Varadhan <sowmini.varadhan@...cle.com>

[ Upstream commit 0edfad5959df7379c9e554fbe8ba264ae232d321 ]

Since it is possible for vnet_event_napi to end up doing
vnet_control_pkt_engine -> ... -> vnet_send_attr ->
vnet_port_alloc_tx_ring -> ldc_alloc_exp_dring -> kzalloc()
(i.e., in softirq context), kzalloc() should be called with
GFP_ATOMIC from ldc_alloc_exp_dring.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
[ kamal: corrected upstream commit SHA ]
Cc: David Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/sparc/kernel/ldc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sparc/kernel/ldc.c b/arch/sparc/kernel/ldc.c
index 274a9f5..591f119f 100644
--- a/arch/sparc/kernel/ldc.c
+++ b/arch/sparc/kernel/ldc.c
@@ -2313,7 +2313,7 @@ void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
 	if (len & (8UL - 1))
 		return ERR_PTR(-EINVAL);
 
-	buf = kzalloc(len, GFP_KERNEL);
+	buf = kzalloc(len, GFP_ATOMIC);
 	if (!buf)
 		return ERR_PTR(-ENOMEM);
 
-- 
1.9.1

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