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: [email protected]
Reporter: [email protected]
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.
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