[3.19.y-ckt stable] Patch "sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in softirq context" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in softirq context

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt4.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 3a900f374277cfa3e0ce54438843ed807096fd0d Mon Sep 17 00:00:00 2001
From: Sowmini Varadhan <sowmini.varadhan at oracle.com>
Date: Tue, 21 Apr 2015 10:30:41 -0400
Subject: sparc: Use GFP_ATOMIC in ldc_alloc_exp_dring() as it can be called in
 softirq context

[ 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 at oracle.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.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