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| author | Bruno Prémont <bonbons@linux-vserver.org> | 2014-12-19 10:29:16 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2015-01-05 18:15:08 +0100 |
| commit | 975f7d467480a11864d71a10dee908b83c5e682b (patch) | |
| tree | 229cf31cb7212150f4e1aded48484fb7f7bc074a /usr | |
| parent | 693a30b8f19a964087a3762d09fb2e1cbad6b0d4 (diff) | |
| download | linux-975f7d467480a11864d71a10dee908b83c5e682b.tar.bz2 | |
qla2xxx: fix busy wait regression
Commit e05fe29248 (qla2xxx: Honor FCP_RSP retry delay timer field.)
causes systems to busy-wait for about 3 minutes after boot prior to
detecting SAN disks.
During this wait period one kworker is running full-time
(though /proc/<pid>/stack has no useful data). Another kworker is
waiting for IO to complete during that whole time period.
Looking at drivers/scsi/qla2xxx/qla_os.c, fcport->retry_delay_timestamp
has a special value of 0 though that 0 value forces system to wait when
jiffies is very large value (e.g. 4294952605 - "negative" value when
signed on 32bit systems).
Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Acked-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'usr')
0 files changed, 0 insertions, 0 deletions