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authorRoland Dreier <rolandd@cisco.com>2007-06-21 11:05:58 -0700
committerRoland Dreier <rolandd@cisco.com>2007-06-21 11:05:58 -0700
commit24bce5080306bd5255cbda3d6b09a29d5515b470 (patch)
treed0061299531d0cda6bd83196f8f4c32c5f93af15 /include/asm-alpha
parentd025d7858f7415f558e89d870ad1a205954b64cd (diff)
IB/umem: Fix possible hang on process exit
If ib_umem_release() is called after ib_uverbs_close() sets context->closing, then a process can get stuck in a D state, because the code boils down to if (down_write_trylock(&mm->mmap_sem)) down_write(&mm->mmap_sem); which is obviously a stupid instant deadlock. Fix the code so that we only try to take the lock once. This bug was introduced in commit f7c6a7b5 ("IB/uverbs: Export ib_umem_get()/ib_umem_release() to modules") which fortunately never made it into a release, and was reported by Pete Wyckoff <pw@osc.edu>. Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'include/asm-alpha')
0 files changed, 0 insertions, 0 deletions