[SCSI] allow sleeping in ->eh_bus_reset_handler()

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/a2091.c b/drivers/scsi/a2091.c
index 9928a2f..ce3c376 100644
--- a/drivers/scsi/a2091.c
+++ b/drivers/scsi/a2091.c
@@ -221,7 +221,11 @@
 static int a2091_bus_reset(Scsi_Cmnd *cmd)
 {
 	/* FIXME perform bus-specific reset */
+
+	spin_lock_irq(cmd->device->host->host_lock);
 	wd33c93_host_reset(cmd);
+	spin_unlock_irq(cmd->device->host->host_lock);
+
 	return SUCCESS;
 }