linux-stable/drivers/virtio
Cornelia Huck ab7a2375fb virtio: hint if callbacks surprisingly might sleep
A virtio transport is free to implement some of the callbacks in
virtio_config_ops in a matter that they cannot be called from
atomic context (e.g. virtio-ccw, which maps a lot of the callbacks
to channel I/O, which is an inherently asynchronous mechanism).
This can be very surprising for developers using the much more
common virtio-pci transport, just to find out that things break
when used on s390.

The documentation for virtio_config_ops now contains a comment
explaining this, but it makes sense to add a might_sleep() annotation
to various wrapper functions in the virtio core to avoid surprises
later.

Note that annotations are NOT added to two classes of calls:
- direct calls from device drivers (all current callers should be
  fine, however)
- calls which clearly won't be made from atomic context (such as
  those ultimately coming in via the driver core)

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-03-06 11:19:57 -05:00
..
Kconfig virtio: make VIRTIO a menuconfig to ease disabling it all 2018-02-01 16:26:43 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
virtio.c virtio: hint if callbacks surprisingly might sleep 2019-03-06 11:19:57 -05:00
virtio_balloon.c virtio_balloon: remove the unnecessary 0-initialization 2019-03-06 11:19:33 -05:00
virtio_input.c virtio: wrap find_vqs 2017-05-02 23:41:42 +03:00
virtio_mmio.c virtio: don't allocate vqs when names[i] = NULL 2019-01-14 20:15:19 -05:00
virtio_pci_common.c virtio_pci: use queue idx instead of array idx to set up the vq 2019-01-14 20:15:18 -05:00
virtio_pci_common.h virtio: Make vp_set_vq_affinity() take a mask. 2018-08-11 12:02:18 -07:00
virtio_pci_legacy.c virtio: remove deprecated VIRTIO_PCI_CONFIG() 2018-12-19 18:23:49 -05:00
virtio_pci_modern.c virtio_pci: support enabling VFs 2018-06-12 04:59:29 +03:00
virtio_ring.c virtio: Introduce virtio_max_dma_size() 2019-03-06 11:19:15 -05:00