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authorTrond Myklebust <trond.myklebust@primarydata.com>2014-11-19 12:47:50 -0500
committerJ. Bruce Fields <bfields@redhat.com>2014-11-19 15:45:44 -0500
commitc6c15e1ed303ffc47e696ea1c9a9df1761c1f603 (patch)
tree14422719ae15d5d0cf05393169e485c4ac645fca /arch/x86/kernel/entry_64.S
parent093a1468b6edb0e568be7311b8d2228d205702db (diff)
nfsd: Fix slot wake up race in the nfsv4.1 callback code
The currect code for nfsd41_cb_get_slot() and nfsd4_cb_done() has no locking in order to guarantee atomicity, and so allows for races of the form. Task 1 Task 2 ====== ====== if (test_and_set_bit(0) != 0) { clear_bit(0) rpc_wake_up_next(queue) rpc_sleep_on(queue) return false; } This patch breaks the race condition by adding a retest of the bit after the call to rpc_sleep_on(). Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'arch/x86/kernel/entry_64.S')
0 files changed, 0 insertions, 0 deletions