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[PULL,v3,74/85] virtio: remove virtio_tswap16s() call in vring_packed_event_read()

Message ID 7aa6492401e95fb296dec7cda81e67d91f6037d7.1720046570.git.mst@redhat.com
State New
Headers show
Series [PULL,v3,01/85] vhost: dirty log should be per backend type | expand

Commit Message

Michael S. Tsirkin July 3, 2024, 10:49 p.m. UTC 
From: Stefano Garzarella <sgarzare@redhat.com>

Commit d152cdd6f6 ("virtio: use virtio accessor to access packed event")
switched using of address_space_read_cached() to virito_lduw_phys_cached()
to access packed descriptor event.

When we used address_space_read_cached(), we needed to call
virtio_tswap16s() to handle the endianess of the field, but
virito_lduw_phys_cached() already handles it internally, so we no longer
need to call virtio_tswap16s() (as the commit had done for `off_wrap`,
but forgot for `flags`).

Fixes: d152cdd6f6 ("virtio: use virtio accessor to access packed event")
Cc: jasowang@redhat.com
Cc: qemu-stable@nongnu.org
Reported-by: Xoykie <xoykie@gmail.com>
Link: https://lore.kernel.org/qemu-devel/CAFU8RB_pjr77zMLsM0Unf9xPNxfr_--Tjr49F_eX32ZBc5o2zQ@mail.gmail.com
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20240701075208.19634-1-sgarzare@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/virtio.c | 1 -
 1 file changed, 1 deletion(-)
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Patch

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 3678ec2f88..583a224163 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -323,7 +323,6 @@  static void vring_packed_event_read(VirtIODevice *vdev,
     /* Make sure flags is seen before off_wrap */
     smp_rmb();
     e->off_wrap = virtio_lduw_phys_cached(vdev, cache, off_off);
-    virtio_tswap16s(vdev, &e->flags);
 }
 
 static void vring_packed_off_wrap_write(VirtIODevice *vdev,