• Bruno Prémont's avatar
    qla2xxx: fix busy wait regression · 975f7d46
    Bruno Prémont authored
    Commit e05fe292 (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: default avatarBruno Prémont <bonbons@linux-vserver.org>
    Acked-by: default avatarChad Dupuis <chad.dupuis@qlogic.com>
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    975f7d46
qla_os.c 159 KB