Hi Hiep, On Fri, Jul 1, 2016 at 9:58 AM, Hiep Cao Minh <cm-hiep@xxxxxxxxxxx> wrote: >>> As I have reported you the issue that related to your released patch. >>> Could you please consider this issue and tell me how to resolve this >>> problem? >>> >>> This issue still happens on Rcar-H2 and Rcar-M2 (Renesas's SOC) at the >>> Linux >>> upstream version v4.7-rc2. >> >> I think the patches that Torvalds merged for v4.7-rc3 >> http://lwn.net/Articles/690987/ especially these two: >> >> Ricardo Ribalda Delgado (2): >> gpiolib: Fix NULL pointer deference >> gpiolib: Fix unaligned used of reference counters >> >> Solves the issue. >> >> Can you verify? > > > I have just verified this on v4.7-rc5, this issue still happens. > But we find out that the issue had already happened before your following > patch was released. > "ff2b1359 gpio: make the gpiochip a real device" (the patch that you have > created before) > I mean, your patch helped us to find out the issue. > > To Geert-san. > > I'd like to divide Unbind-Rebind test into two cases of Normal Test and > Abnormal Test. > > First, If we try to unbind/rebind the gpio device(ex: key, hdmi..) then > unbind/rebind the gpio-rcar, > It works normally without error message. This test case is normal test. > Refer to (GPIO_Unbind-Rebind_Abnormal-Test_log.txt) > > But on the other hand, If we try to unbind/rebind the gpio-rcar without > unbinding/rebinding gpio device, > The warning message looks like from kernel will happens. This test case is > abnormal test. > (Refer to GPIO_Unbind-Rebind_Normal-Test_logs.txt) > > In abnormal Test case, an error message occurs definitely from the driver or > the core class of the driver. > But I think we should consider the error or warning message looks like a > kernel warning message. Quoting Linus Walleij: > It is not OK to unbind a driver providing IRQs. The irqchip subsystem has no protection against removing devices providing interrupt controllers. Trying to do so anyway while an interrupt is in use will go boom. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
