Messages in this thread | | | Subject | Re: [PATCH] drm: Take mmap_sem up front to avoid lock order violations. | From | Peter Zijlstra <> | Date | Thu, 19 Feb 2009 11:33:21 +0100 |
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On Thu, 2009-02-19 at 10:19 +0100, Peter Zijlstra wrote: > On Wed, 2009-02-18 at 11:38 -0500, krh@bitplanet.net wrote: > > From: Kristian Høgsberg <krh@redhat.com> > > > > A number of GEM operations (and legacy drm ones) want to copy data to > > or from userspace while holding the struct_mutex lock. However, the > > fault handler calls us with the mmap_sem held and thus enforces the > > opposite locking order. This patch downs the mmap_sem up front for > > those operations that access userspace data under the struct_mutex > > lock to ensure the locking order is consistent. > > > > Signed-off-by: Kristian Høgsberg <krh@redhat.com> > > --- > > > > Here's a different and simpler attempt to fix the locking order > > problem. We can just down_read() the mmap_sem pre-emptively up-front, > > and the locking order is respected. It's simpler than the > > mutex_trylock() game, avoids introducing a new mutex. > >
OK let me try that again -- my initial response was a tad curt :/
While I appreciate your efforts in fixing GEM (I too have an interest in seeing it done), I cannot support your patch.
Firstly, you're using mmap_sem well outside its problem domain, this is bad form. Furthermore, holding it for extended durations for no good reason affects all other users.
Secondly, mmap_sem is not a recursive lock (very few kernel locks are, and we generally frown upon recursive locking schemes), this means that the fault handler still cannot function properly.
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