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[S390] sclp: handle empty event buffers

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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 <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter 2009-02-19 15:18:59 +01:00 committed by Martin Schwidefsky
parent ba95fd47d1
commit e2e5a0f2b1
1 changed files with 4 additions and 1 deletions
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5
drivers/s390/char/sclp.c
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@ -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);