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[S390] qdio: prevent handling of buffers if count is zero
[firefly-linux-kernel-4.4.55.git]
/
drivers
/
s390
/
cio
/
qdio_main.c
diff --git
a/drivers/s390/cio/qdio_main.c
b/drivers/s390/cio/qdio_main.c
index 5640c89cd9de3bae5f6f283f08eda97d7b3c3960..479c665e9e7c25f91996eeb287770384009c9b7a 100644
(file)
--- a/
drivers/s390/cio/qdio_main.c
+++ b/
drivers/s390/cio/qdio_main.c
@@
-1508,7
+1508,8
@@
int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
return -EBUSY;
-
+ if (!count)
+ return 0;
if (callflags & QDIO_FLAG_SYNC_INPUT)
return handle_inbound(irq_ptr->input_qs[q_nr],
callflags, bufnr, count);