Date: Thu, 3 Aug 2017 22:17:17 -0400 From: Farhan Khan <khanzf@gmail.com> To: freebsd-hackers@freebsd.org Subject: PCI bus detaching when driver crashing? Message-ID: <CAFd4kYAi-o7=Vb%2B5mwZp4-VkUJPvUOr=REgsnfiHgN9pEhta4w@mail.gmail.com>
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Hi all, I am trying to write the Realtek 8188e (pci) driver for FreeBSD. I am making slow incremental progress, and having the driver safely exit out (as opposed to a segfault). I noticed that when the device detaches, due to an error in the driver, the entire pci bus will also detach! For example, here is my kernel output: rtwn0: rtwn_load_firmware: failed to upload firmware rtwn-rtl8188eefw (error 60) rtwn0: detached pci2: detached The first line is where the code crashes: sys/dev/rtwn/if_rtwn_fw.c line 129 https://github.com/khanzf/freebsd/blob/103c05369b1ced770a2cadc9468e0134c8d9421b/sys/dev/rtwn/if_rtwn_fw.c#L129 Why would this result in the entire pci2 bus detatching? Strangely enough, I did not have this problem a few months ago, then it suddenly began. This is significantly slowing down my workflow, and would be nice to have it resolved. Otherwise, I have to reboot to bring pci2 back up. Any insight? Thanks! Farhan Khan
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