lkml.org 
[lkml]   [2014]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 12/16] isdn: pcbit: fix interruptible_sleep_on race
Date
interruptible_sleep_on is racy and going away. In case of pcbit,
the driver would run into a timeout if the card is initialized
before we start waiting for it. This uses wait_event to fix the
race. In order to do this, the state machine handling for the
timeout case has to get trivially reorganized so we actually know
whether the timeout has occorred or not.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: netdev@vger.kernel.org
---
drivers/isdn/pcbit/drv.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/isdn/pcbit/drv.c b/drivers/isdn/pcbit/drv.c
index 1eaf622..f02cc50 100644
--- a/drivers/isdn/pcbit/drv.c
+++ b/drivers/isdn/pcbit/drv.c
@@ -796,6 +796,7 @@ static void set_running_timeout(unsigned long ptr)
#endif
dev = (struct pcbit_dev *) ptr;

+ dev->l2_state = L2_DOWN;
wake_up_interruptible(&dev->set_running_wq);
}

@@ -818,7 +819,8 @@ static int set_protocol_running(struct pcbit_dev *dev)

add_timer(&dev->set_running_timer);

- interruptible_sleep_on(&dev->set_running_wq);
+ wait_event(dev->set_running_wq, dev->l2_state == L2_RUNNING ||
+ dev->l2_state == L2_DOWN);

del_timer(&dev->set_running_timer);

@@ -842,8 +844,6 @@ static int set_protocol_running(struct pcbit_dev *dev)
printk(KERN_DEBUG "pcbit: initialization failed\n");
printk(KERN_DEBUG "pcbit: firmware not loaded\n");

- dev->l2_state = L2_DOWN;
-
#ifdef DEBUG
printk(KERN_DEBUG "Bank3 = %02x\n",
readb(dev->sh_mem + BANK3));
--
1.8.3.2


\
 
 \ /
  Last update: 2014-02-26 13:01    [W:0.268 / U:1.996 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site