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authorTejun Heo <htejun@gmail.com>2007-07-16 09:29:41 +0400
committerJeff Garzik <jeff@garzik.org>2007-07-20 16:26:26 +0400
commit5ddf24c5ea9d715dc4f5d5d5dd1c9337d90466dc (patch)
tree6ba89094decfada468fba1f4670b9395c6f66e42 /drivers/fc4
parent4e57c517b3cbaceb7438eeec879ca129fc17442c (diff)
downloadlinux-5ddf24c5ea9d715dc4f5d5d5dd1c9337d90466dc.tar.xz
libata: implement EH fast drain
In most cases, when EH is scheduled, all in-flight commands are aborted causing EH to kick in immediately. However, in some cases (especially with PMP), it's unclear which commands are affected by the error condition and although aborting all in-flight commands work, it isn't optimal and may cause unnecessary disruption. On the other hand, waiting for in-flight commands to drain themselves can take up to 30seconds. This patch implements EH fast drain to handle such situations. It gives in-flight commands some time to finish up but doesn't wait for too long. After EH is scheduled, fast drain timer is started and if no other completion occurs in ATA_EH_FASTDRAIN_INTERVAL all in-flight commands are aborted. If any completion occurred in the interval, the port is given another interval to finish up itself. Currently ATA_EH_FASTDRAIN_INTERVAL is 3 secs which should be enough for finishing up most commands. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/fc4')
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