The ixgb driver may sleep under a mutex, and the function call path in file
"sys/dev/ixgb/if_ixgb.c" in FreeBSD 11.0 is:
ixgb_init [line 750: acquire the mutex]
ixgb_init_locked [line 751]
ixgb_setup_receive_structures [line 699]
ixgb_allocate_receive_structures [line 1913]
ixgb_get_buf [line 1885]
bus_dmamap_load(BUS_DMA_WAITOK) [line 1812] --> may sleep
The possible fix of these bugs 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.
By the way, I am a freshman in developing FreeBSD drivers, and I am willing to
submit a patch. 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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