Re: [PATCH] accel/qaic: Protect perf stats BO state with bo->lock

[Jeff Hugo]

On 5/23/2026 1:32 AM, Shuvam Pandey wrote:
> qaic_perf_stats_bo_ioctl() validates each BO by checking bo->sliced and
> bo->dbc before returning its perf stats. These fields are changed by the
> detach paths while holding bo->lock, but the perf stats ioctl reads them
> without that lock.
>
> A concurrent detach can clear bo->dbc and mark the BO unsliced while the
> perf stats ioctl is validating the BO. Take bo->lock while checking the
> BO state and copying the per-BO stats into the temporary result buffer.
>
> Fixes: 4ddf4ddfceb4 ("accel/qaic: Ensure entry belongs to DBC in qaic_perf_stats_bo_ioctl()")
> Signed-off-by: Shuvam Pandey <shuvampandey1@xxxxxxxxx>

Reviewed-by: Jeff Hugo <jeff.hugo@xxxxxxxxxxxxxxxx>

Pushed to drm-misc-next.

-Jeff