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Commit 99437a27 authored by Cornelia Huck's avatar Cornelia Huck Committed by Gleb Natapov
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KVM: s390: virtio_ccw: reset errors for new I/O. 



ccw_io_helper neglected to reset vcdev->err after a new channel
program had been successfully started, resulting in stale errors
delivered after one I/O failed. Reset the error after a new
channel program has been successfully started with no old I/O
pending.

Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
parent 450e0b41

drivers/s390/kvm/virtio_ccw.c

+4 −1
Original line number Diff line number Diff line
@@ -133,8 +133,11 @@ static int ccw_io_helper(struct virtio_ccw_device *vcdev, 
	do {

		spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);

		ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);

		if (!ret)

		if (!ret) {

			if (!vcdev->curr_io)

				vcdev->err = 0;

			vcdev->curr_io |= flag;

		}

		spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);

		cpu_relax();

	} while (ret == -EBUSY);