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[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>
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@ -1212,9 +1212,14 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
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retval = -ENODEV;
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if (scsi_block_when_processing_errors(sdp)) {
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retval = scsi_autopm_get_device(sdp);
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if (retval)
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goto out;
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sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
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retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
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sshdr);
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scsi_autopm_put_device(sdp);
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}
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/* failed to execute TUR, assume media not present */
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