[PATCH 3.11 62/66] wireless: cw1200: acquire hwbus lock around cw1200_irq_handler() call.

Greg Kroah-Hartman
2013-11-01T22:14:09Z

From: Solomon Peachy <pizza@shaftnet.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@egauge.net>
Signed-off-by: Solomon Peachy <pizza@shaftnet.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;