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authorTejun Heo <htejun@gmail.com>2007-07-16 01:29:41 -0400
committerJeff Garzik <jeff@garzik.org>2007-07-20 08:26:26 -0400
commit5ddf24c5ea9d715dc4f5d5d5dd1c9337d90466dc (patch)
tree6ba89094decfada468fba1f4670b9395c6f66e42 /drivers/ata/libata.h
parent4e57c517b3cbaceb7438eeec879ca129fc17442c (diff)
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/ata/libata.h')
-rw-r--r--drivers/ata/libata.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 48836b22ce2f..564cd234c805 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -151,6 +151,7 @@ extern int ata_bus_probe(struct ata_port *ap);
151extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd); 151extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
152extern void ata_scsi_error(struct Scsi_Host *host); 152extern void ata_scsi_error(struct Scsi_Host *host);
153extern void ata_port_wait_eh(struct ata_port *ap); 153extern void ata_port_wait_eh(struct ata_port *ap);
154extern void ata_eh_fastdrain_timerfn(unsigned long arg);
154extern void ata_qc_schedule_eh(struct ata_queued_cmd *qc); 155extern void ata_qc_schedule_eh(struct ata_queued_cmd *qc);
155 156
156/* libata-sff.c */ 157/* libata-sff.c */