linux-kernel - [PATCH 3.11 62/66] wireless: cw1200: acquire hwbus lock around cw1200_irq

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Date:	Fri,  1 Nov 2013 15:07:38 -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, David Mosberger <davidm@...uge.net>,
	Solomon Peachy <pizza@...ftnet.org>,
	"John W. Linville" <linville@...driver.com>
Subject: [PATCH 3.11 62/66] wireless: cw1200: acquire hwbus lock around cw1200_irq_handler() call.

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

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

From: Solomon Peachy <pizza@...ftnet.org>

commit 4978705d26149a629b9f50ff221caed6f1ae3048 upstream.

This fixes "lost interrupt" problems that occurred on SPI-based systems.
cw1200_irq_handler() expects the hwbus to be locked, but on the
SPI-path, that lock wasn't taken (unlike in the SDIO-path, where the
generic SDIO-code takes care of acquiring the lock).

Signed-off-by: David Mosberger <davidm@...uge.net>
Signed-off-by: Solomon Peachy <pizza@...ftnet.org>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/cw1200/cw1200_spi.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/wireless/cw1200/cw1200_spi.c
+++ b/drivers/net/wireless/cw1200/cw1200_spi.c
@@ -237,7 +237,9 @@ static irqreturn_t cw1200_spi_irq_handle
 	struct hwbus_priv *self = dev_id;

 	if (self->core) {
+		cw1200_spi_lock(self);
 		cw1200_irq_handler(self->core);
+		cw1200_spi_unlock(self);
 		return IRQ_HANDLED;
 	} else {
 		return IRQ_NONE;

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