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authorCornelia Huck <cohuck@redhat.com>2019-04-08 14:33:22 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-04-17 08:39:50 +0200
commit88fa815395e3e082be1961fdf6c606ba1e23b342 (patch)
tree2ca00ccfcc2298cbfebf2f356ead6fb6089d180b /scripts/gdb/linux/utils.py
parentec64558908d78a56422f72633151eb9a3b7953a9 (diff)
virtio: Honour 'may_reduce_num' in vring_create_virtqueue
commit cf94db21905333e610e479688add629397a4b384 upstream. vring_create_virtqueue() allows the caller to specify via the may_reduce_num parameter whether the vring code is allowed to allocate a smaller ring than specified. However, the split ring allocation code tries to allocate a smaller ring on allocation failure regardless of what the caller specified. This may cause trouble for e.g. virtio-pci in legacy mode, which does not support ring resizing. (The packed ring code does not resize in any case.) Let's fix this by bailing out immediately in the split ring code if the requested size cannot be allocated and may_reduce_num has not been specified. While at it, fix a typo in the usage instructions. Fixes: 2a2d1382fe9d ("virtio: Add improved queue allocation API") Cc: stable@vger.kernel.org # v4.6+ Signed-off-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Halil Pasic <pasic@linux.ibm.com> Reviewed-by: Jens Freimann <jfreimann@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts/gdb/linux/utils.py')
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