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| author | Lin Ming <ming.m.lin@intel.com> | 2011-12-05 09:20:24 +0800 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2012-01-08 19:14:57 -0500 |
| commit | ae0751ffc77e7f21629970fdab5528c573e637f8 (patch) | |
| tree | e42ad3d5a5d2c5b742c6b129fd3bb532f29389f7 /drivers/scsi/scsi_error.c | |
| parent | 9a6d6a2ddabbd32c07f6a38b659e5f3db319fa5a (diff) | |
| download | talos-obmc-linux-ae0751ffc77e7f21629970fdab5528c573e637f8.tar.gz talos-obmc-linux-ae0751ffc77e7f21629970fdab5528c573e637f8.zip | |
[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>
Diffstat (limited to 'drivers/scsi/scsi_error.c')
| -rw-r--r-- | drivers/scsi/scsi_error.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index dc6131e6a1ba..5f84a148eb14 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -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); |
