From: Sebastian Ott Date: Tue, 5 Sep 2017 12:22:48 +0000 (+0200) Subject: s390/cmf: set_schib_wait add timeout X-Git-Tag: Ubuntu-5.0.0-8.9~3678^2~72 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=adc69b4d76ee8a7065c7c637584b39ace265ffab;p=mirror_ubuntu-disco-kernel.git s390/cmf: set_schib_wait add timeout When enabling channel measurement fails with a busy condition we wait for the next interrupt to arrive before we retry the operation. For devices which usually don't create interrupts we wait forever. Although the waiting is done interruptible that behavior is not expected and confused some users. Abort the operation after a 10s timeout. Signed-off-by: Sebastian Ott Reviewed-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky --- diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c index 220491d27ef4..be0b010ff136 100644 --- a/drivers/s390/cio/cmf.c +++ b/drivers/s390/cio/cmf.c @@ -227,6 +227,7 @@ static void cmf_set_schib_release(struct kref *kref) } #define CMF_PENDING 1 +#define SET_SCHIB_TIMEOUT (10 * HZ) static int set_schib_wait(struct ccw_device *cdev, u32 mme, int mbfc, unsigned long address) @@ -263,19 +264,19 @@ static int set_schib_wait(struct ccw_device *cdev, u32 mme, cdev->private->state = DEV_STATE_CMFCHANGE; set_data->ret = CMF_PENDING; cdev->private->cmb_wait = set_data; - spin_unlock_irq(cdev->ccwlock); - if (wait_event_interruptible(set_data->wait, - set_data->ret != CMF_PENDING)) { - spin_lock_irq(cdev->ccwlock); + + ret = wait_event_interruptible_timeout(set_data->wait, + set_data->ret != CMF_PENDING, + SET_SCHIB_TIMEOUT); + spin_lock_irq(cdev->ccwlock); + if (ret <= 0) { if (set_data->ret == CMF_PENDING) { - set_data->ret = -ERESTARTSYS; + set_data->ret = (ret == 0) ? -ETIME : ret; if (cdev->private->state == DEV_STATE_CMFCHANGE) cdev->private->state = DEV_STATE_ONLINE; } - spin_unlock_irq(cdev->ccwlock); } - spin_lock_irq(cdev->ccwlock); cdev->private->cmb_wait = NULL; ret = set_data->ret; out_put: