On 04.06.25 14:56:22, Nathan Fontenot wrote: > On 6/3/2025 6:49 PM, Dave Jiang wrote: > > > > > > On 6/3/25 3:19 PM, Smita Koralahalli wrote: > >> Add a NULL check in is_cxl_region() to prevent potential null pointer > >> dereference if a caller passes a NULL device. This change ensures the > >> function safely returns false instead of triggering undefined behavior > >> when dev is NULL. > > > > Don't think this change is necessary. The code paths should not be hitting any NULL region devices unless it's a programming error. > > I originally added this to the patchset during some initial development to handle possible > NULL dev pointers when updating soft reserve resources, see cxl_region_softreserv_update() > in patch 5/7. > > In the current form of the that routine it appears we shouldn't execute the while loop > if dev is NULL so this could get from the patch set. With the suggested change to use bus_for_each_dev() in patch #5 this patch should be dropped. -Robert
