staging: unisys: visorbus: handle visorchannel_write errors in code

Catch and report back errors when visorchannel_write fails.
Signed-off-by: NDavid Kershner <david.kershner@unisys.com>
Reviewed-by: NTim Sell <timothy.sell@unisys.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visorbus/visorchannel.c

@@ -328,27 +328,24 @@ static int
 signalinsert_inner(struct visorchannel *channel, u32 queue, void *msg)
 {
 	struct signal_queue_header sig_hdr;
-	int error;
+	int err;
 
-	error = sig_read_header(channel, queue, &sig_hdr);
-	if (error)
-		return error;
+	err = sig_read_header(channel, queue, &sig_hdr);
+	if (err)
+		return err;
 
 	sig_hdr.head = (sig_hdr.head + 1) % sig_hdr.max_slots;
 	if (sig_hdr.head == sig_hdr.tail) {
 		sig_hdr.num_overflows++;
-		visorchannel_write(channel,
-				   SIG_QUEUE_OFFSET(&channel->chan_hdr, queue) +
-				   offsetof(struct signal_queue_header,
-					    num_overflows),
-				   &sig_hdr.num_overflows,
-				   sizeof(sig_hdr.num_overflows));
+		err = SIG_WRITE_FIELD(channel, queue, &sig_hdr, num_overflows);
+		if (err)
+			return err;
 		return -EIO;
 	}
 
-	error = sig_write_data(channel, queue, &sig_hdr, sig_hdr.head, msg);
-	if (error)
-		return error;
+	err = sig_write_data(channel, queue, &sig_hdr, sig_hdr.head, msg);
+	if (err)
+		return err;
 
 	sig_hdr.num_sent++;
 
@@ -358,12 +355,12 @@ signalinsert_inner(struct visorchannel *channel, u32 queue, void *msg)
 	 */
 	mb(); /* required for channel synch */
 
-	error = SIG_WRITE_FIELD(channel, queue, &sig_hdr, head);
-	if (error)
-		return error;
-	error = SIG_WRITE_FIELD(channel, queue, &sig_hdr, num_sent);
-	if (error)
-		return error;
+	err = SIG_WRITE_FIELD(channel, queue, &sig_hdr, head);
+	if (err)
+		return err;
+	err = SIG_WRITE_FIELD(channel, queue, &sig_hdr, num_sent);
+	if (err)
+		return err;
 
 	return 0;
 }