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| H A D | file.c | d5883137 Mon Feb 25 20:31:42 CST 2008 Jeremy Kerr <jk@ozlabs.org> [POWERPC] spufs: fix context destruction during psmap fault
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>
d5883137 Mon Feb 25 20:31:42 CST 2008 Jeremy Kerr <jk@ozlabs.org> [POWERPC] spufs: fix context destruction during psmap fault
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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