Date: Tue, 9 Feb 2016 14:55:54 +0530 From: Sreekanth Reddy <sreekanth.reddy@broadcom.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org, ken@freebsd.org, scsi@freebsd.org, current@freebsd.org Subject: Re: Panic on reloading a driver with same DEVICE_PROBE() return value Message-ID: <CAK=zhgpjD2aF-XNiSG6AHojJm1gxvARXTc2enrnoQzLHe=WksA@mail.gmail.com> In-Reply-To: <33145844.5EAIpev2G5@ralph.baldwin.cx> References: <CAK=zhgoGwXSsD-mNF=jGov1FJFnpM7m_fZ0Jwsq4JR5yazB%2Bww@mail.gmail.com> <33145844.5EAIpev2G5@ralph.baldwin.cx>
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On Mon, Feb 8, 2016 at 11:58 PM, John Baldwin <jhb@freebsd.org> wrote: > On Monday, February 08, 2016 08:13:26 PM Sreekanth Reddy wrote: >> sc->facts = malloc(sizeof(MPI2_IOC_FACTS_REPLY), M_MPR, M_ZERO|M_NOWAIT); > > M_NOWAIT can fail with NULL. Normally in an attach routine you should use a > blocking malloc (M_WAITOK) which will not fail with NULL. Yes I agree that in an attach routine we should to use a blocking malloc (M_WAITOK) flag. But, here I am observing same page fault even with (M_WAITOK) flag. Here, page fault is occurring inside the malloc function and driver is not receiving any NULL or any other value. > >> * How can I reload the modified driver with return same device_probe() >> value as the one which has loaded during the OS boot time. I observed >> that whenever I try to load this modified driver using "kldload >> ./mpr.ko" command then I see that driver in the /boot/kernel/ path has >> executed. > > At runtime you can use the devctl(8) command on HEAD (it will be included > in 10.3) to force a device to detach/attach to force a re-probe. > > e.g. > > devctl detach mpr0 > > # note that the device won't be named mpr0, you will need to use its PCI > # location for this next: > > devctl attach pci0:4:0:0 I have started downloading the current kernel. I will verify this today/tomorrow. > > -- > John Baldwin
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