linux-kernel - [PATCH 3.8 45/91] mwifiex: fix SDIO interrupt lost issue

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Date:	Thu,  7 Nov 2013 18:15:00 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Amitkumar Karwar <akarwar@...vell.com>,
	Bing Zhao <bzhao@...vell.com>,
	Paul Stewart <pstew@...omium.org>,
	"John W. Linville" <linville@...driver.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 45/91] mwifiex: fix SDIO interrupt lost issue

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

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

From: Amitkumar Karwar <akarwar@...vell.com>

commit 453b0c3f6910672f79da354077af728d92f95c5b upstream.

601216e "mwifiex: process RX packets in SDIO IRQ thread directly"
introduced a command timeout issue which can be reproduced easily on
an AM33xx platform using a test application written by Daniel Mack:

https://gist.github.com/zonque/6579314

mwifiex_main_process() is called from both the SDIO handler and
the workqueue. In case an interrupt occurs right after the
int_status check, but before updating the mwifiex_processing flag,
this interrupt gets lost, resulting in a command timeout and
consequently a card reset.

Let main_proc_lock protect both int_status and mwifiex_processing
flag. This fixes the interrupt lost issue.

Reported-by: Sven Neumann <s.neumann@...mfeld.com>
Reported-by: Andreas Fenkart <andreas.fenkart@...eamunlimited.com>
Tested-by: Daniel Mack <zonque@...il.com>
Reviewed-by: Dylan Reid <dgreid@...omium.org>
Signed-off-by: Amitkumar Karwar <akarwar@...vell.com>
Signed-off-by: Bing Zhao <bzhao@...vell.com>
Signed-off-by: Paul Stewart <pstew@...omium.org>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/wireless/mwifiex/main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mwifiex/main.c b/drivers/net/wireless/mwifiex/main.c
index 6d9bc63..a3d1a89 100644
--- a/drivers/net/wireless/mwifiex/main.c
+++ b/drivers/net/wireless/mwifiex/main.c
@@ -270,10 +270,12 @@ process_start:
 		}
 	} while (true);
 
-	if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter))
+	spin_lock_irqsave(&adapter->main_proc_lock, flags);
+	if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter)) {
+		spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 		goto process_start;
+	}
 
-	spin_lock_irqsave(&adapter->main_proc_lock, flags);
 	adapter->mwifiex_processing = false;
 	spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 
-- 
1.8.1.2

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