Date: Tue, 15 Aug 2017 07:59:03 -0700 From: John Baldwin <jhb@freebsd.org> To: freebsd-drivers@freebsd.org Subject: Re: Driver crash detaches entire PCI bus? Message-ID: <3743762.5XtXr8DZrt@ralph.baldwin.cx> In-Reply-To: <CAFd4kYCNBpBDRZwcERfWA7qB30Jg3VAEUsKD5sU71HQyNjOLrQ@mail.gmail.com> References: <CAFd4kYCNBpBDRZwcERfWA7qB30Jg3VAEUsKD5sU71HQyNjOLrQ@mail.gmail.com>
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On Thursday, August 03, 2017 09:52:54 PM Farhan Khan wrote: > 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. You should be able to 'devctl attach pci2' I think without having to reboot. I would perhaps use dtrace to figure out why the PCI bus is detaching by just doing something like 'dtrace -n 'fbt::pci_detach:entry { stack(); }' to get a stack trace when pci_detach is called. We might be able to figure out the bug from there. -- John Baldwin
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