linux-kernel - [PATCH 3.12 076/124] sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in softirq context

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Message-Id: <665de56e0eb394f36e437164d0c6f26c41c92091.1438076484.git.jslaby@suse.cz>
Date:	Tue, 28 Jul 2015 11:43:30 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Sowmini Varadhan <sowmini.varadhan@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.com>
Subject: [PATCH 3.12 076/124] sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in softirq context

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

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

===============

commit 0edfad5959df7379c9e554fbe8ba264ae232d321 upstream.

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.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 27bb55485472..7ef28625c199 100644
--- a/arch/sparc/kernel/ldc.c
+++ b/arch/sparc/kernel/ldc.c
@@ -2307,7 +2307,7 @@ 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);
 
-- 
2.4.6

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