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authorTejun Heo <htejun@gmail.com>2006-07-03 16:07:27 +0900
committerJeff Garzik <jeff@garzik.org>2006-07-05 22:16:28 -0400
commit500530f652f9e5dabe7571b018dec47742ce0f16 (patch)
treecb9653c45a7e37d9bfe8dcc3923ed6b33ca134ea /crypto/Kconfig
parentd6f26d1f1f1128a896f38a7f8426daed0a1205a2 (diff)
[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>
Diffstat (limited to 'crypto/Kconfig')
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