[S390] sclp: handle empty event buffers

Handle a malformed hardware response which some versions of the Support Element (SE) may present during SE restart and which otherwise would result in an endless loop in function sclp_dispatch_evbufs. Signed-off-by: Peter Oberparleiter <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
yshchan · Feb 19, 2009 · e2e5a0f · e2e5a0f
1 parent ba95fd4
commit e2e5a0f
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
@@ -280,8 +280,11 @@ sclp_dispatch_evbufs(struct sccb_header *sccb)
 	rc = 0;
 	for (offset = sizeof(struct sccb_header); offset < sccb->length;
 	     offset += evbuf->length) {
-		/* Search for event handler */
 		evbuf = (struct evbuf_header *) ((addr_t) sccb + offset);
+		/* Check for malformed hardware response */
+		if (evbuf->length == 0)
+			break;
+		/* Search for event handler */
 		reg = NULL;
 		list_for_each(l, &sclp_reg_list) {
 			reg = list_entry(l, struct sclp_register, list);