wl1251: fix oops on early interrupt

BugLink: http://bugs.launchpad.net/bugs/1013748

commit f380f2c4a12e913356bd49f8790ec1063c4fe9f8 upstream.

This driver disables interrupt just after requesting it and enables it
later, after interface is up. However currently there is a time window
between request_irq() and disable_irq() where if interrupt arrives, the
driver oopses because it's not yet ready to process it. This can be
reproduced by inserting the module, associating and removing the module
multiple times.

Eliminate this race by setting IRQF_NOAUTOEN flag before request_irq().

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>

2 files changed, 2 insertions, 3 deletions

diff --git a/drivers/net/wireless/wl1251/sdio.c b/drivers/net/wireless/wl1251/sdio.c
index 85a710182a8..4cf5c2e201d 100644
--- a/drivers/net/wireless/wl1251/sdio.c
+++ b/drivers/net/wireless/wl1251/sdio.c
@@ -259,6 +259,7 @@ static int wl1251_sdio_probe(struct sdio_func *func,
         }
 
         if (wl->irq) {
+                irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
                 ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
                 if (ret < 0) {
                         wl1251_error("request_irq() failed: %d", ret);
@@ -266,7 +267,6 @@ static int wl1251_sdio_probe(struct sdio_func *func,
                 }
 
                 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
-                disable_irq(wl->irq);
 
                 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
                 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
diff --git a/drivers/net/wireless/wl1251/spi.c b/drivers/net/wireless/wl1251/spi.c
index af6448c4d3e..49f3651423d 100644
--- a/drivers/net/wireless/wl1251/spi.c
+++ b/drivers/net/wireless/wl1251/spi.c
@@ -280,6 +280,7 @@ static int __devinit wl1251_spi_probe(struct spi_device *spi)
 
         wl->use_eeprom = pdata->use_eeprom;
 
+        irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
         ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
         if (ret < 0) {
                 wl1251_error("request_irq() failed: %d", ret);
@@ -288,8 +289,6 @@ static int __devinit wl1251_spi_probe(struct spi_device *spi)
 
         irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
 
-        disable_irq(wl->irq);
-
         ret = wl1251_init_ieee80211(wl);
         if (ret)
                 goto out_irq;