[Bug 220238] sys/dev/tws/tws.c: A possible sleep-under-mutex bug in tws_init_reqs

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220238

            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 at FreeBSD.org
          Reporter: baijiaju1990 at 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.

-- 
You are receiving this mail because:
You are the assignee for the bug.