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[SCSI] add flag to skip the runtime PM calls on the host 

With previous change, now the ata port runtime suspend will happen as:

disk suspend --> scsi target suspend --> scsi host suspend --> ata port
suspend

ata port(parent device) suspend need to schedule scsi EH which will resume
scsi host(child device). Then the child device resume will in turn make
parent device resume first. This is kind of recursive.

This patch adds a new flag Scsi_Host::eh_noresume.
ata port will set this flag to skip the runtime PM calls on scsi host.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Lin Ming 2011-12-05 09:20:24 +08:00 committed by Jeff Garzik
parent 9a6d6a2dda
commit ae0751ffc7
2 changed files with 6 additions and 2 deletions
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5
drivers/scsi/scsi_error.c
View File

@ -1812,7 +1812,7 @@ int scsi_error_handler(void *data)
* what we need to do to get it up and online again (if we can).
* If we fail, we end up taking the thing offline.
*/
if (scsi_autopm_get_host(shost) != 0) {
if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) {
SCSI_LOG_ERROR_RECOVERY(1,
printk(KERN_ERR "Error handler scsi_eh_%d "
"unable to autoresume\n",
@ -1833,7 +1833,8 @@ int scsi_error_handler(void *data)
* which are still online.
*/
scsi_restart_operations(shost);
scsi_autopm_put_host(shost);
if (!shost->eh_noresume)
scsi_autopm_put_host(shost);
set_current_state(TASK_INTERRUPTIBLE);
}
__set_current_state(TASK_RUNNING);

3
include/scsi/scsi_host.h
View File

@ -669,6 +669,9 @@ struct Scsi_Host {
/* Asynchronous scan in progress */
unsigned async_scan:1;
/* Don't resume host in EH */
unsigned eh_noresume:1;
/*
* Optional work queue to be utilized by the transport
*/