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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: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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1 changed files with 4 additions and 1 deletions
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@ -280,8 +280,11 @@ sclp_dispatch_evbufs(struct sccb_header *sccb)
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rc = 0;
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for (offset = sizeof(struct sccb_header); offset < sccb->length;
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offset += evbuf->length) {
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/* Search for event handler */
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evbuf = (struct evbuf_header *) ((addr_t) sccb + offset);
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/* Check for malformed hardware response */
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if (evbuf->length == 0)
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break;
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/* Search for event handler */
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reg = NULL;
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list_for_each(l, &sclp_reg_list) {
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reg = list_entry(l, struct sclp_register, list);
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