| Summary: | [scsi] sys/dev/dpt/dpt_scsi.c: a sleep-under-mutex bug in dpt_init | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Jia-Ju Bai <baijiaju1990> |
| Component: | kern | Assignee: | freebsd-bugs (Nobody) <bugs> |
| Status: | Closed Not A Bug | ||
| Severity: | Affects Only Me | CC: | hardware, scsi |
| Priority: | --- | ||
| Version: | 11.0-RELEASE | ||
| Hardware: | Any | ||
| OS: | Any | ||
I have read the manual page of bus_dmamap_load. This call will always return immediately and will not block for any reason. Sorry for my wrong report, please ignore it. |
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