From: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxxx>
The check_events interface was added for check if device changes,
mainly for device is removable eg. CDROM
In sd_open, it checks if device is removable then check_disk_change.
when the device is not removable, we can simple succeeds the call
without send TUR.
Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxxx>
---
drivers/scsi/sd.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index ab75ebd..773ce81 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1576,6 +1576,10 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
sdp = sdkp->device;
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
+ if (!sdp->removable) {
+ retval = 0;
+ goto out;
+ }
/*
* If the device is offline, don't send any commands - just pretend as
* if the command failed. If the device ever comes back online, we
--
2.7.4
