Roland Dreier 6ef190cc92 IPoIB: Fix crash when path record fails after path flush ... Commit ee1e2c82 ("IPoIB: Refresh paths instead of flushing them on SM change events") changed how paths are flushed on an SM event. This change introduces a problem if the path record query triggered by fails, causing path->ah to become NULL. A later successful path query will then trigger WARN_ON() in path_rec_completion(), and crash because path->ah has already been freed, so the ipoib_put_ah() inside the lock in path_rec_completion() may actually drop the last reference (contrary to the comment that claims this is safe). Fix this by updating path->ah and freeing old_ah only when the path record query is successful. This prevents the neighbour AH and that path AH from getting out of sync. This fixes <https://bugs.openfabrics.org/show_bug.cgi?id=1194> Reported-by: Rabah Salem <ravah@mellanox.com> Debugged-by: Eli Cohen <eli@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2008-09-25 16:37:03 -07:00
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core	Merge branches 'cma', 'cxgb3', 'ipath', 'ipoib', 'mad' and 'mlx4' into for-linus	2008-08-07 14:12:03 -07:00
hw	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband	2008-09-19 16:18:21 -07:00
ulp	IPoIB: Fix crash when path record fails after path flush	2008-09-25 16:37:03 -07:00
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