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authorPeter Oberparleiter <peter.oberparleiter@de.ibm.com>2009-02-19 15:18:59 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-02-19 15:19:19 +0100
commite2e5a0f2b100a5204d27def8bbf73333d1710be2 (patch)
tree9ac0c72074dcc17f5083defda5d2270119f3e633 /drivers/s390/char
parentba95fd47d177d46743ad94055908d22840370e06 (diff)
downloadop-kernel-dev-e2e5a0f2b100a5204d27def8bbf73333d1710be2.zip
op-kernel-dev-e2e5a0f2b100a5204d27def8bbf73333d1710be2.tar.gz
[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>
Diffstat (limited to 'drivers/s390/char')
-rw-r--r--drivers/s390/char/sclp.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index 1fd8f21..4377e93 100644
--- 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);
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