diff options
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/char/sclp_sd.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_sd.c b/drivers/s390/char/sclp_sd.c index f9e164be7568..5aeb7e094a1c 100644 --- a/drivers/s390/char/sclp_sd.c +++ b/drivers/s390/char/sclp_sd.c @@ -194,6 +194,10 @@ static int sclp_sd_sync(unsigned long page, u8 eq, u8 di, u64 sat, u64 sa, struct sclp_sd_evbuf *evbuf; int rc; + if (!sclp_sd_register.sclp_send_mask || + !sclp_sd_register.sclp_receive_mask) + return -EIO; + sclp_sd_listener_init(&listener, __pa(sccb)); sclp_sd_listener_add(&listener); |