Commit 9a26513e authored Mar 23, 2011 by Jan Glauber Committed by Martin Schwidefsky Mar 23, 2011

[S390] qdio: prevent handling of buffers if count is zero



Exit do_QDIO early if the buffer count is zero to prevent side effects
in the following functions.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent 4cc69531

drivers/s390/cio/qdio_main.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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);

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