linux-kernel - Re: [PATCH v6] amba: Remove deferred device addition

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Date:   Fri, 12 Aug 2022 08:30:46 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Isaac Manjarres <isaacmanjarres@...gle.com>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        patches@...linux.org.uk, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] amba: Remove deferred device addition

On 8/11/22 22:12, Isaac Manjarres wrote:
> On Thu, Aug 11, 2022 at 12:55:08PM -0700, Guenter Roeck wrote:
>>
>> Ah, it must be triggered by one of the configuration options I have enabled
>> on top of versatile_defconfig. Sorry, I should have checked. Please try
>> with the configuration below.
>>
>> Guenter
> 
> Thanks for sharing your config options; I was able to reproduce the
> crash after copying your config options to my repository :) The
> following changes fixed the problem for me. Can you please give them a
> try on your end to see if they work for you too?
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 90b31fb141a5..0315bc2853ef 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -1117,7 +1117,9 @@ static int __driver_attach(struct device *dev, void *data)
>           * is an error.
>           */
> 
> +       device_lock(dev);
>          ret = driver_match_device(drv, dev);
> +       device_unlock(dev);
>          if (ret == 0) {
>                  /* no match */
>                  return 0;
> 

After more testing: the changes above result in qemu sx1 boot failures.
There is no crash, boot just hangs.

qemu command line:

qemu-system-arm -M sx1 -kernel arch/arm/boot/zImage -no-reboot \
	-initrd rootfs-armv4.cpio \
	--append "rdinit=/sbin/init console=ttyS0,115200 earlycon=uart8250,mmio32,0xfffb0000,115200n8" \
	-nographic -monitor null -serial stdio

with configuration from
https://github.com/groeck/linux-build-test/blob/master/rootfs/arm/qemu_sx1_defconfig
and root file system from
https://github.com/groeck/linux-build-test/blob/master/rootfs/arm/rootfs-armv4.cpio.gz

This is with your other patch applied.

Guenter