[POWERPC] spufs: fix context destruction during psmap fault

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We have a small window where a spu context may be destroyed while
we're servicing a page fault (from another thread) to the context's
problem state mapping.

After we up_read() the mmap_sem, it's possible that the context is
destroyed by its owning thread, and so the later references to ctx
are invalid. This can maifest as a deadlock on the (now free()-ed)
context state mutex.

This change adds a reference to the context before we release the
mmap_sem, so that the context cannot be destroyed.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

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Jeremy Kerr 2008-02-26 13:31:42 +11:00

parent 61b36fc1f7

commit d58831375d

1 changed files with 11 additions and 1 deletions

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arch/powerpc/platforms/cell/spufs/file.c

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