[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 (file)
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -3155,11 +3155,11 @@ static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
 
        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