From ae0751ffc77e7f21629970fdab5528c573e637f8 Mon Sep 17 00:00:00 2001 From: Lin Ming Date: Mon, 5 Dec 2011 09:20:24 +0800 Subject: [PATCH] [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 Signed-off-by: Lin Ming Signed-off-by: Jeff Garzik --- drivers/scsi/scsi_error.c | 5 +++-- include/scsi/scsi_host.h | 3 +++ 2 files changed, 6 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); diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 50266c9405fc..5f7d5b3b1c6e 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -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 */