usb: gadget: f_fs: DMA-BUF fixes

[PATCH 0/2] usb: gadget: f_fs: DMA-BUF fixes

Sam Day via B4 Relay posted 2 patches 1 month ago

Download series mbox

drivers/usb/gadget/function/f_fs.c | 24 +++++++++---------------
1 file changed, 9 insertions(+), 15 deletions(-)

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[PATCH 0/2] usb: gadget: f_fs: DMA-BUF fixes

Posted by Sam Day via B4 Relay 1 month ago

I recently started kicking the tires on DMA-BUF support in FunctionFS.
In the process, I found a couple of issues that are fixed in this
series.

One issue is a minor bug in how the ioctl handler treats invalid calls.
The other is more serious and breaks DMA transfers on systems with a
tenacious SMMU.

I created a fairly minimal reproducer of the DMA issue in this gist, to
assist in testing:

https://gist.github.com/samcday/d23aaf95be678bcdd1dd62b4b79861ea

Tested on:
 - Pixel 3a
 - OnePlus 6T

Signed-off-by: Sam Day <me@samcday.com>
---
Sam Day (2):
      usb: gadget: f_fs: Fix ioctl error handling
      usb: gadget: f_fs: fix DMA-BUF OUT queues

 drivers/usb/gadget/function/f_fs.c | 24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)
---
base-commit: f0b9d8eb98dfee8d00419aa07543bdc2c1a44fb1
change-id: 20251114-ffs-dmabuf-ioctl-fix-272497182f86

Best regards,
-- 
Sam Day <me@samcday.com>