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f7728002c1
linux/drivers/virtio
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Halil Pasic f7728002c1 virtio_ring: fix return code on DMA mapping fails 
Commit 780bc7903a ("virtio_ring: Support DMA APIs")  makes
virtqueue_add() return -EIO when we fail to map our I/O buffers. This is
a very realistic scenario for guests with encrypted memory, as swiotlb
may run out of space, depending on it's size and the I/O load.

The virtio-blk driver interprets -EIO form virtqueue_add() as an IO
error, despite the fact that swiotlb full is in absence of bugs a
recoverable condition.

Let us change the return code to -ENOMEM, and make the block layer
recover form these failures when virtio-blk encounters the condition
described above.

Cc: stable@vger.kernel.org
Fixes: 780bc7903a ("virtio_ring: Support DMA APIs")
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Tested-by: Michael Mueller <mimu@linux.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2019-11-19 05:13:49 -05:00
..
Kconfig virtio-pmem: Add virtio pmem driver 2019-07-05 15:19:10 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
virtio_balloon.c Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
virtio_input.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
virtio_mmio.c virtio-mmio: add error check for platform_get_irq 2019-07-11 16:22:29 -04:00
virtio_pci_common.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 78 2019-05-24 17:37:51 +02:00
virtio_pci_common.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 78 2019-05-24 17:37:51 +02:00
virtio_pci_legacy.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 78 2019-05-24 17:37:51 +02:00
virtio_pci_modern.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 78 2019-05-24 17:37:51 +02:00
virtio_ring.c virtio_ring: fix return code on DMA mapping fails 2019-11-19 05:13:49 -05:00
virtio.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00