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| /freebsd-10.2-release/sys/ofed/include/linux/ | ||
| H A D | workqueue.h | diff 250374 Wed May 08 17:46:54 MDT 2013 delphij According to the documentation, on Linux, cancel_delayed_work() does not do drain (flush_workqueue() in Linux terms) but instead returns true if the work was removed before it is run, or false otherwise. Simulate this by removing the taskqueue_drain() and return the value derived from taskqueue_cancel()'s return value. This would solve a witness warning caused by calling taskqueue_drain() with a non-sleepable lock held, like: taskqueue_drain with the following non-sleepable locks held: exclusive rw lle (lle) r = 0 (0xfffffe001450b410) locked @ /usr/src/sys/netinet/in.c:1484 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xffffff848d4f7690 kdb_backtrace() at kdb_backtrace+0x39/frame 0xffffff848d4f7740 witness_warn() at witness_warn+0x4a8/frame 0xffffff848d4f7800 taskqueue_drain() at taskqueue_drain+0x3a/frame 0xffffff848d4f7840 set_timeout() at set_timeout+0x4a/frame 0xffffff848d4f7860 netevent_callback() at netevent_callback+0x16/frame 0xffffff848d4f7870 arpintr() at arpintr+0x9b5/frame 0xffffff848d4f7930 This do not affect kernel without OFED compiled in. Reported by: Garrett Cooper <yaneurabeya gmail com> (who also tested an earlier version of this patch, but bugs are mine) MFC after: 2 weeks |
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