virtio_net: split out ctrl buffer

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[ Upstream commit 12e5716938 ]

When sending control commands, virtio net sets up several buffers for
DMA. The buffers are all part of the net device which means it's
actually allocated by kvmalloc so it's in theory (on extreme memory
pressure) possible to get a vmalloc'ed buffer which on some platforms
means we can't DMA there.

Fix up by moving the DMA buffers into a separate structure.

Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Michael S. Tsirkin 2018-04-19 08:30:48 +03:00 • committed by Greg Kroah-Hartman

parent 16c36a2c76

commit d86aacaaf9

1 changed files with 39 additions and 29 deletions

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drivers/net/virtio_net.c

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