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authorLan Tianyu <tianyu.lan@intel.com>2012-03-15 11:11:31 +0800
committerJames Bottomley <JBottomley@Parallels.com>2012-03-19 11:34:18 +0000
commit4e2247b2bd289f079349d6c69755f8cff4e31f2b (patch)
tree49f7824b1b09a6c3402d84b2173963eecdfce418 /drivers/scsi/sd.c
parentcd8df932d894f3128c884e3ae1b2b484540513db (diff)
downloadlinux-4e2247b2bd289f079349d6c69755f8cff4e31f2b.tar.bz2
[SCSI] sd: Add runtime pm in the sd_check_events()
The sd_check_event() will be called periodly even when the device is in the suspended status to check media event. The scsi_test_unit_ready() in the sd_check_event() will issue scsi cmd request. Issuing scsi request when the device is in the suspeneded status will cause problem. For example, when a usb flash disk in the suspended status, scsi_test_unit_ready() issues a scsi request. The request will be returned as failed because the usb device is not active. The patch adds scsi_autopm_get_device() and scsi_autopm_put_device() around scsi_test_unit_ready() in the sd_check_event() to resolve such problem. Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index bd17cf8af013..367635045880 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1212,9 +1212,14 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
retval = -ENODEV;
if (scsi_block_when_processing_errors(sdp)) {
+ retval = scsi_autopm_get_device(sdp);
+ if (retval)
+ goto out;
+
sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
sshdr);
+ scsi_autopm_put_device(sdp);
}
/* failed to execute TUR, assume media not present */