On Sat, Jan 07, 2023 at 02:29:22AM +0800, Daniel Vetter wrote: >On Fri, Jan 06, 2023 at 05:09:34PM +0800, Jiasheng Jiang wrote: >> Add checks for the return value of alloc_workqueue and >> alloc_ordered_workqueue as they may return NULL pointer and cause NULL >> pointer dereference. >> Moreover, destroy them when fails later in order to avoid memory leak. >> Because in `drivers/gpu/drm/i915/i915_driver.c`, if >> intel_modeset_init_noirq fails, its workqueues will not be destroyed. >> >> Fixes: c26a058680dc ("drm/i915: Use a high priority wq for nonblocking plane updates") >> Fixes: 757fffcfdffb ("drm/i915: Put all non-blocking modesets onto an ordered wq") >> Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx> > > So you have an entire pile of these, and I think that's a really good > excuse to > - create a drmm_alloc_workqueue helper for these (and > drmm_alloc_ordered_workqueue) using the drmm_add_action_or_reset() > function for automatic drm_device cleanup > - use that instead in all drivers, which means you do not have to make any > error handling mor complex > > Up for that? In that case please also convert any existing alloc*workqueue > callsites in drm, and make this all a patch series (since then there would > be dependencies). Fine, I have submitted two patches. The first one create the drmm_alloc_workqueue and drmm_alloc_ordered_workqueue helpers. And the second one replace the alloc*workqueue with DRM helpers in `drivers/gpu/drm/i915/display/intel_display.c`. If there is no problem in these two, I will submitted the other patches that replace the alloc*workqueue in other DRM files. Thanks, Jiang