forked from Minki/linux
4eae374845
The error flow of ipoib_ib_dev_open() invokes ipoib_ib_dev_stop() with workqueue flushing enabled, which deadlocks if the open procedure itself was called by a worker thread. Fix this by adding a flush enabled flag to ipoib_ib_dev_open() and set it accordingly from the locations where such a call is made. The call trace was the following: [<ffffffff81095bc4>] ? flush_workqueue+0x54/0x80 [<ffffffffa056c657>] ? ipoib_ib_dev_stop+0x447/0x650 [ib_ipoib] [<ffffffffa056cc34>] ? ipoib_ib_dev_open+0x284/0x430 [ib_ipoib] [<ffffffffa05674a8>] ? ipoib_open+0x78/0x1d0 [ib_ipoib] [<ffffffffa05697b8>] ? ipoib_pkey_open+0x38/0x40 [ib_ipoib] [<ffffffffa056cf3c>] ? __ipoib_ib_dev_flush+0x15c/0x2c0 [ib_ipoib] [<ffffffffa056ce56>] ? __ipoib_ib_dev_flush+0x76/0x2c0 [ib_ipoib] [<ffffffffa056d0a0>] ? ipoib_ib_dev_flush_heavy+0x0/0x20 [ib_ipoib] [<ffffffffa056d0ba>] ? ipoib_ib_dev_flush_heavy+0x1a/0x20 [ib_ipoib] [<ffffffff81094d20>] ? worker_thread+0x170/0x2a0 [<ffffffff8109b2a0>] ? autoremove_wake_function+0x0/0x40 Signed-off-by: Erez Shitrit <erezsh@mellanox.com> Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Acked-by: Alex Estrin <alex.estrin@intel.com> Signed-off-by: Roland Dreier <roland@purestorage.com> |
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