[lkml]   [2015]   [May]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH RFC] s390/sclp: pass timeout as HZ independent value
schedule_timeout takes a timeout in jiffies but the code currently is
passing in a constant SDIAS_SLEEP_TICKS which sounds like it should be
in jiffies but it is actually not and thus makes this timeout HZ
dependent, to fix this it is passed through msecs_to_jiffies().

patch was not even compile tested as s390 toolchain from
failed for me (on a debian wheezy x86_64) with:
cc1: error: unrecognized command line option '-mtune=zEC12'

Patch is against 4.0-rc5 (localversion-next is -next-20150527)

Signed-off-by: Nicholas Mc Guire <>

As there is no documentation of the intended timeout it might be wrong
to convert it with msecs_to_jiffies() since the effective timeout is
at least a factor 10 smaller than it is now - so someone that knows this
driver needs to check on the actual value - but in any case it needs to
be passed in a HZ independent way.

drivers/s390/char/sclp_sdias.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/s390/char/sclp_sdias.c b/drivers/s390/char/sclp_sdias.c
index eb7cb07..ab92a75 100644
--- a/drivers/s390/char/sclp_sdias.c
+++ b/drivers/s390/char/sclp_sdias.c
@@ -68,7 +68,7 @@ static int sdias_sclp_send(struct sclp_req *req)
/* not initiated, wait some time and retry */
TRACE("add request failed: rc = %i\n",rc);
- schedule_timeout(SDIAS_SLEEP_TICKS);
+ schedule_timeout(msecs_to_jiffies(SDIAS_SLEEP_TICKS));
/* initiated, wait for completion of service call */

 \ /
  Last update: 2015-05-27 19:41    [W:0.044 / U:26.836 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site