https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219986
Bug ID: 219986
Summary: [mly] sys/dev/mly/mly.c: a sleep-under-mutex bug in
mly_user_command
Product: Base System
Version: 11.0-RELEASE
Hardware: i386
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
The mly driver may sleep under a mutex, and the function call path in file
"sys/dev/mly/mly.c" in FreeBSD 11.0 is:
mly_user_command [line 2925: acquire the mutex]
mly_start [line 2926]
mly_map_command [line 1489]
bus_dmamap_load_ccb(BUS_DMA_WAITOK) [line 1880] --> may sleep
bus_dmamap_load(BUS_DMA_WAITOK) [line 1883] --> may sleep
The possible fix of this bug is to set last parameter in bus_dmamap_load_ccb
and bus_dmamap_load to "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.
By the way, I am a freshman in developing FreeBSD drivers, and I am willing to
submit a patch to fix this bug. But I do not know how to write and submit a
patch, and where to submit, so I am looking forward to useful advice :)
Jia-Ju Bai
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