scsi: ufs: core: Simplify ufshcd_exception_event_handler()

The ufshcd_scsi_block_requests() and ufshcd_scsi_unblock_requests()
calls were introduced in ufshcd_exception_event_handler() to prevent
that querying the exception event information would time out. Commit
10fe5888a40e ("scsi: ufs: increase the scsi query response timeout")
increased the timeout for querying exception information from 30 ms to
1.5 s and thereby eliminated the risk that a timeout would happen.
Hence, the calls to block and unblock SCSI requests are superfluous.
Remove these calls.

Reviewed-by: Peter Wang <[e-mail]>
Tested-by: Avri Altman <[e-mail]>
Signed-off-by: Bart Van Assche <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/ufs/core/ufshcd.c

···
 	u32 status = 0;
 	hba = container_of(work, struct ufs_hba, eeh_work);
 
-	ufshcd_scsi_block_requests(hba);
 	err = ufshcd_get_ee_status(hba, &status);
 	if (err) {
 		dev_err(hba->dev, "%s: failed to get exception status %d\n",
 				__func__, err);
-		goto out;
+		return;
 	}
 
 	trace_ufshcd_exception_event(dev_name(hba->dev), status);
···
 		ufshcd_temp_exception_event_handler(hba, status);
 
 	ufs_debugfs_exception_event(hba, status);
-out:
-	ufshcd_scsi_unblock_requests(hba);
 }
 
 /* Complete requests that have door-bell cleared */