On Fri, 25 Apr 2025 14:39:28 +0100, Robin Murphy wrote:

Since it's not currently safe to take device_lock() in the IOMMU probe
path, that can race against really_probe() setting dev->driver before
attempting to bind. The race itself isn't so bad, since we're only
concerned with dereferencing dev->driver itself anyway, but sadly my
attempt to implement the check with minimal churn leads to a kind of
TOCTOU issue, where dev->driver becomes valid after to_fsl_mc_driver(NULL)
is already computed, and thus the check fails to work as intended.

[...]

Applied, thanks!

[1/1] bus: fsl_mc: Fix driver_managed_dma check
      commit: 152f33ee30ee6a7f4c15bedd7529dc5945315547

Best regards,
-- 
Christophe Leroy [off-list ref]