From b32ecdb7257821e5e42d9b9b2a427b02c89f85e7 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Tue, 19 Feb 2008 15:29:30 +0100 Subject: [S390] qdio: fix qdio_activate timeout handling. Current code in qdio_activate waits for at least 5 seconds until it returns. It may return earlier if an error occurs, but not if everything is ok. This large timeout value became visible with commit dfa77f611ff295598e218aa0eb6efa73a5cf26d0 "qdio: set QDIO_ACTIVATE_TIMEOUT to 5s", which intended to fix the timeout value which was zero. In turn setting an FCP adapter online took 5 seconds. In practice waiting for 5ms before continuing is sufficient as pointed out by Utz Bacher and Cornelia Huck. Cc: Utz Bacher Cc: Jan Glauber Cc: Ursula Braun Cc: Martin Peschke Acked-by: Cornelia Huck Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/qdio.c | 10 ++-------- drivers/s390/cio/qdio.h | 2 +- 2 files changed, 3 insertions(+), 9 deletions(-) (limited to 'drivers/s390') diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c index 097fc0967e9d..cd9cfc1326d2 100644 --- a/drivers/s390/cio/qdio.c +++ b/drivers/s390/cio/qdio.c @@ -32,7 +32,7 @@ #include #include - +#include #include #include #include @@ -3332,13 +3332,7 @@ qdio_activate(struct ccw_device *cdev, int flags) } } - wait_event_interruptible_timeout(cdev->private->wait_q, - ((irq_ptr->state == - QDIO_IRQ_STATE_STOPPED) || - (irq_ptr->state == - QDIO_IRQ_STATE_ERR)), - QDIO_ACTIVATE_TIMEOUT); - + msleep(QDIO_ACTIVATE_TIMEOUT); switch (irq_ptr->state) { case QDIO_IRQ_STATE_STOPPED: case QDIO_IRQ_STATE_ERR: diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h index 37870e4e938e..da8a272fd75b 100644 --- a/drivers/s390/cio/qdio.h +++ b/drivers/s390/cio/qdio.h @@ -57,10 +57,10 @@ of the queue to 0 */ #define QDIO_ESTABLISH_TIMEOUT (1*HZ) -#define QDIO_ACTIVATE_TIMEOUT (5*HZ) #define QDIO_CLEANUP_CLEAR_TIMEOUT (20*HZ) #define QDIO_CLEANUP_HALT_TIMEOUT (10*HZ) #define QDIO_FORCE_CHECK_TIMEOUT (10*HZ) +#define QDIO_ACTIVATE_TIMEOUT (5) /* 5 ms */ enum qdio_irq_states { QDIO_IRQ_STATE_INACTIVE, -- cgit v1.2.2