diff options
| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-02-19 15:29:30 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-02-19 15:29:34 +0100 |
| commit | b32ecdb7257821e5e42d9b9b2a427b02c89f85e7 (patch) | |
| tree | 6f4e7362078b1560f8cc780fec54742d89a81928 /drivers/s390/cio/qdio.h | |
| parent | [S390] Initialize per cpu lowcores on cpu hotplug. (diff) | |
| download | linux-dev-b32ecdb7257821e5e42d9b9b2a427b02c89f85e7.tar.xz linux-dev-b32ecdb7257821e5e42d9b9b2a427b02c89f85e7.zip | |
[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 <utz.bacher@de.ibm.com>
Cc: Jan Glauber <jan.glauber@de.ibm.com>
Cc: Ursula Braun <braunu@de.ibm.com>
Cc: Martin Peschke <mp3@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/qdio.h')
| -rw-r--r-- | drivers/s390/cio/qdio.h | 2 |
1 files changed, 1 insertions, 1 deletions
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, |