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authorTom Tucker <tom@opengridcomputing.com>2008-08-13 12:05:41 -0400
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-08-13 16:57:31 -0400
commit24b8b44780a2c53ecb738f4a1c08d114f5eda27c (patch)
treef772e59438783c6230158ea65bd5aeb3f84f4202 /fs/nfsd
parent30a2f3c60a84092c8084dfe788b710f8d0768cd4 (diff)
svcrdma: Fix race between svc_rdma_recvfrom thread and the dto_tasklet
RDMA_READ completions are kept on a separate queue from the general I/O request queue. Since a separate lock is used to protect the RDMA_READ completion queue, a race exists between the dto_tasklet and the svc_rdma_recvfrom thread where the dto_tasklet sets the XPT_DATA bit and adds I/O to the read-completion queue. Concurrently, the recvfrom thread checks the generic queue, finds it empty and resets the XPT_DATA bit. A subsequent svc_xprt_enqueue will fail to enqueue the transport for I/O and cause the transport to "stall". The fix is to protect both lists with the same lock and set the XPT_DATA bit with this lock held. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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