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13 June 2022, 11:31:42 UTC
Revision 500530f652f9e5dabe7571b018dec47742ce0f16 authored by Tejun Heo on 03 July 2006, 07:07:27 UTC, committed by Jeff Garzik on 06 July 2006, 02:16:28 UTC 
[PATCH] libata: reimplement controller-wide PM
 
Reimplement controller-wide PM.  ata_host_set_suspend/resume() are
defined to suspend and resume a host_set.  While suspended, EHs for
all ports in the host_set are pegged using ATA_FLAG_SUSPENDED and
frozen.

Because SCSI device hotplug is done asynchronously against the rest of
libata EH and the same mutex is used when adding new device, suspend
cannot wait for hotplug to complete.  So, if SCSI device hotplug is in
progress, suspend fails with -EBUSY.

In most cases, host_set resume is followed by device resume.  As each
resume operation requires a reset, a single host_set-wide resume
operation may result in multiple resets.  To avoid this, resume waits
upto 1 second giving PM to request resume for devices.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
1 parent d6f26d1
History
Tip revision: 500530f652f9e5dabe7571b018dec47742ce0f16 authored by Tejun Heo on 03 July 2006, 07:07:27 UTC
[PATCH] libata: reimplement controller-wide PM
Tip revision: 500530f
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