virtio/s390: avoid race on vcdev->config

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Currently we have a race on vcdev->config in virtio_ccw_get_config() and
in virtio_ccw_set_config().

This normally does not cause problems, as these are usually infrequent
operations. However, for some devices writing to/reading from the config
space can be triggered through sysfs attributes. For these, userspace can
force the race by increasing the frequency.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Cc: stable@vger.kernel.org
Message-Id: <20180925121309.58524-2-pasic@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

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Halil Pasic 2018-09-26 18:48:29 +02:00 • committed by Michael S. Tsirkin

parent c38f57da42

commit 2448a299ec

1 changed files with 8 additions and 2 deletions

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drivers/s390/virtio/virtio_ccw.c

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