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[S390] dasd: check tsb validity 

Check tsb validity before the tcw_get_tsb function is called.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland 2010-03-24 11:49:54 +01:00 committed by Martin Schwidefsky
parent 4a31ba57ca
commit b8fde7224d
1 changed files with 2 additions and 2 deletions
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4
drivers/s390/block/dasd_eckd.c
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@ -3155,11 +3155,11 @@ static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
tsb = NULL; tsb = NULL;
sense = NULL; sense = NULL;
if (irb->scsw.tm.tcw) if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs == 0x01))
tsb = tcw_get_tsb( tsb = tcw_get_tsb(
(struct tcw *)(unsigned long)irb->scsw.tm.tcw); (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
if (tsb && (irb->scsw.tm.fcxs == 0x01)) { if (tsb) {
len += sprintf(page + len, KERN_ERR PRINTK_HEADER len += sprintf(page + len, KERN_ERR PRINTK_HEADER
" tsb->length %d\n", tsb->length); " tsb->length %d\n", tsb->length);
len += sprintf(page + len, KERN_ERR PRINTK_HEADER len += sprintf(page + len, KERN_ERR PRINTK_HEADER