Date: Sun, 18 Jun 2017 11:49:18 +0800 From: Jia-Ju Bai <baijiaju1990@163.com> To: freebsd-drivers@freebsd.org Subject: [Bug 220095] [scsi] sys/dev/dpt/dpt_scsi.c: a sleep-under-mutex bug in dpt_init Message-ID: <a06eb4f7-5fc5-ef2d-2bd5-efa3d8a06e89@163.com>
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The driver may sleep under a mutex, and the function call path in file
"sys/dev/dpt/dpt_scsi.c" in FreeBSD 11.0 is:
dpt_init [line 1246: acquire the mutex]
dptallocsgmap [line 1282]
bus_dmamap_load(BUS_DMA_WAITOK) [line 323] --> may sleep
The possible fix of this bug is to set the last parameter in
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.
Thanks,
Jia-Ju Bai
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