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[SCSI] sd: check runtime PM status in sd_shutdown

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sd_shutdown is called during reboot/poweroff.
It may fail if parent device, for example, ata port, was runtime suspended.

Fix it by checking runtime PM status of sd.
Exit immediately if sd was runtime suspended already.

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 09:20:26 +08:00 committed by Jeff Garzik
parent 286405167e
commit 54f5758846
1 changed files with 5 additions and 0 deletions
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5
drivers/scsi/sd.c
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@ -50,6 +50,7 @@
#include <linux/string_helpers.h>
#include <linux/async.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>
@ -2741,6 +2742,9 @@ static void sd_shutdown(struct device *dev)
if (!sdkp)
return; /* this can happen */
if (pm_runtime_suspended(dev))
goto exit;
if (sdkp->WCE) {
sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
sd_sync_cache(sdkp);
@ -2751,6 +2755,7 @@ static void sd_shutdown(struct device *dev)
sd_start_stop_device(sdkp, 0);
}
exit:
scsi_disk_put(sdkp);
}