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Commit e2e5a0f2 authored by Peter Oberparleiter's avatar Peter Oberparleiter Committed by Martin Schwidefsky
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[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: default avatarPeter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent ba95fd47

drivers/s390/char/sclp.c

+4 −1
Original line number Diff line number Diff line
@@ -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);