On Sat, Oct 31, 2020 at 12:35:36PM +0100, Greg Kroah-Hartman wrote: > From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > commit 4fe9af8e881d946bf60790eeb37a7c4f96e28382 upstream. > > Since the debugfs may peek into the GEM contexts as the corresponding > client/fd is being closed, we may try and follow a dangling pointer. > However, the context closure itself is serialised with the ctx->mutex, > so if we hold that mutex as we inspect the state coupled in the context, > we know the pointers within the context are stable and will remain valid > as we inspect their tables. > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: CQ Tang <cq.tang@xxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> > Link: https://patchwork.freedesktop.org/patch/msgid/20200723172119.17649-3-chris@xxxxxxxxxxxxxxxxxx > (cherry picked from commit 102f5aa491f262c818e607fc4fee08a724a76c69) > Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > > --- > drivers/gpu/drm/i915/i915_debugfs.c | 2 ++ > 1 file changed, 2 insertions(+) Oops, nope, this breaks the build here, now dropping it... greg k-h
