diff options
| author | Sam Day <me@samcday.com> | 2026-01-08 08:30:21 +1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-01-14 15:58:22 +0100 |
| commit | 0145e7acd29855dfba4a2f387d455b5d9a520f0e (patch) | |
| tree | f046815254f74fea8e8f3e34322ec2b19307a410 /include/linux/usb | |
| parent | 8e4c1d06183c25022f6b0002a5cab84979ca6337 (diff) | |
usb: gadget: f_fs: fix DMA-BUF OUT queues
Currently, DMA_FROM_DEVICE is used when attaching DMABUFs to IN
endpoints and DMA_TO_DEVICE for OUT endpoints. This is inverted from
how it should be.
The result is IOMMU read-only mappings placed on OUT queues,
triggering arm-smmu write faults.
Put differently, OUT endpoints flow data from host -> gadget, meaning
the UDC peripheral needs to have write access to the buffer to fill it
with the incoming data.
This commit flips the directions and updates the implicit-sync helpers
so IN endpoints act as readers and OUT endpoints as writers.
Signed-off-by: Sam Day <me@samcday.com>
Tested-by: David Heidelberg <david@ixit.cz> # OnePlus 6T on sdm845-next-20251119
Link: https://patch.msgid.link/20260108-ffs-dmabuf-ioctl-fix-v1-2-e51633891a81@samcday.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb')
0 files changed, 0 insertions, 0 deletions