| Summary: | sys/dev/mlx/mlx.c: A possible sleep-under-mutex bug in mlx_alloccmd | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Jia-Ju Bai <baijiaju1990> |
| Component: | kern | Assignee: | freebsd-bugs (Nobody) <bugs> |
| Status: | New --- | ||
| Severity: | Affects Only Me | ||
| Priority: | --- | ||
| Version: | CURRENT | ||
| Hardware: | Any | ||
| OS: | Any | ||
The driver may sleep under a mutex, and the function call path is: mlx_attach [line 432: acquire the mutex] mlx_enquire mlx_alloccmd bus_dmamap_create(BUS_DMA_WAITOK) --> 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.