Date: Sat, 24 Jun 2017 03:16:34 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 220238] sys/dev/tws/tws.c: A possible sleep-under-mutex bug in tws_init_reqs Message-ID: <bug-220238-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220238 Bug ID: 220238 Summary: sys/dev/tws/tws.c: A possible sleep-under-mutex bug in tws_init_reqs Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: baijiaju1990@163.com The driver may sleep under a mutex, and code path is: tws_init_reqs [line 684: acquire the mutex] tws_init_reqs [line 685] bus_dmamap_create(BUS_DMA_WAITOK) [line 687] --> may sleep The possible fix of this bug is to replace the "BUS_DMA_WAITOK" in bus_dmamap_create with "BUS_DMA_NOWAIT". This bug is found by a static analysis tool written by myself, and it is checked by my review of the FreeBSD code. --=20 You are receiving this mail because: You are the assignee for the bug.=
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