linux-kernel - [PATCH 3.14 01/30] sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in softirq context

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Message-Id: <20150708073156.018602455@linuxfoundation.org>
Date:	Wed,  8 Jul 2015 00:34:00 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Sowmini Varadhan <sowmini.varadhan@...cle.com>
Subject: [PATCH 3.14 01/30] sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in softirq context

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

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

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

Upstream commit 671d773297969bebb1732e1cdc1ec03aa53c6be2

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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/sparc/kernel/ldc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/sparc/kernel/ldc.c
+++ b/arch/sparc/kernel/ldc.c
@@ -2307,7 +2307,7 @@ void *ldc_alloc_exp_dring(struct ldc_cha
 	if (len & (8UL - 1))
 		return ERR_PTR(-EINVAL);
 
-	buf = kzalloc(len, GFP_KERNEL);
+	buf = kzalloc(len, GFP_ATOMIC);
 	if (!buf)
 		return ERR_PTR(-ENOMEM);
 


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