[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>
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 01f4e7a..0cb2331 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -3155,11 +3155,11 @@
tsb = NULL;
sense = NULL;
- if (irb->scsw.tm.tcw)
+ if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs == 0x01))
tsb = tcw_get_tsb(
(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
" tsb->length %d\n", tsb->length);
len += sprintf(page + len, KERN_ERR PRINTK_HEADER