tree c740b3e4ee8c75ade937b2c8fc9fcbeb7f87cfe6
parent a2b51812a4dc5db09ab4d4638d4d8ed456e2457e
author Jeremy Kerr <jk@ozlabs.org> 1195180343 +1100
committer Paul Mackerras <paulus@samba.org> 1195535420 +1100

[POWERPC] spufs: Fix context destroy vs /spu readdir race

We can currently cause an oops by repeatedly creating and destroying
contexts, while doing getdents() calls on the "/spu" directory.

This is due to the context's top-level dentry remaining hashed while
the context is being destroyed.

Fix this by unhashing the context's dentry with the
dentry->d_inode->i_mutex held. This way, we'll hit the check for
d_unhashed in dentry_readdir, and won't be included in the
list of subdirs for /spu.

test: spufs-testsuite:tests/01-spu_create/07-destroy-vs-readdir-race

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>