Date:   Tue, 20 Apr 2021 20:26:53 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>
Cc:     corbet@....net, gregkh@...uxfoundation.org, rafael@...nel.org,
        khilman@...nel.org, ulf.hansson@...aro.org, len.brown@...el.com,
        lenb@...nel.org, pavel@....cz, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org, frowand.list@...il.com,
        maz@...nel.org, tglx@...utronix.de, saravanak@...gle.com,
        nicolas.ferre@...rochip.com, claudiu.beznea@...rochip.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-acpi@...r.kernel.org,
        m.szyprowski@...sung.com, geert@...ux-m68k.org,
        kernel-team@...roid.com
Subject: Re: [PATCH] clk: Mark fwnodes when their clock provider is added

Hi,

On Wed, Feb 10, 2021 at 01:44:35PM +0200, Tudor Ambarus wrote:
> This is a follow-up for:
> commit 3c9ea42802a1 ("clk: Mark fwnodes when their clock provider is added/removed")
> 
> The above commit updated the deprecated of_clk_add_provider(),
> but missed to update the preferred of_clk_add_hw_provider().
> Update it now.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>

This patch still causes a crash when booting a raspi2 image in linux-next.

[   21.456500] Unable to handle kernel NULL pointer dereference at virtual address 00000028
[   21.456750] pgd = (ptrval)
[   21.456927] [00000028] *pgd=00000000
[   21.457567] Internal error: Oops: 5 [#1] SMP ARM
[   21.457882] Modules linked in:
[   21.458077] CPU: 0 PID: 77 Comm: kworker/u8:10 Not tainted 5.12.0-rc8-next-20210420 #1
[   21.458291] Hardware name: BCM2835
[   21.458525] Workqueue: events_unbound deferred_probe_work_func
[   21.458997] PC is at of_clk_add_hw_provider+0xbc/0xe8
[   21.459176] LR is at of_clk_add_hw_provider+0xa8/0xe8
...
[   21.477603] [<c0a32aec>] (of_clk_add_hw_provider) from [<c0a32b60>] (devm_of_clk_add_hw_provider+0x48/0x80)
[   21.477861] [<c0a32b60>] (devm_of_clk_add_hw_provider) from [<c0a471e4>] (raspberrypi_clk_probe+0x260/0x388)
[   21.478087] [<c0a471e4>] (raspberrypi_clk_probe) from [<c0c1c4d0>] (platform_probe+0x5c/0xb8)
[   21.478287] [<c0c1c4d0>] (platform_probe) from [<c0c19d84>] (really_probe+0xf0/0x39c)
[   21.478471] [<c0c19d84>] (really_probe) from [<c0c1a098>] (driver_probe_device+0x68/0xc0)
[   21.478659] [<c0c1a098>] (driver_probe_device) from [<c0c17f54>] (bus_for_each_drv+0x84/0xc8)
[   21.478860] [<c0c17f54>] (bus_for_each_drv) from [<c0c19c20>] (__device_attach+0xec/0x158)
[   21.479050] [<c0c19c20>] (__device_attach) from [<c0c18de8>] (bus_probe_device+0x88/0x90)
[   21.479236] [<c0c18de8>] (bus_probe_device) from [<c0c16a68>] (device_add+0x398/0x8ac)
[   21.479421] [<c0c16a68>] (device_add) from [<c0c1c1b4>] (platform_device_add+0xf0/0x200)
[   21.479607] [<c0c1c1b4>] (platform_device_add) from [<c0c1ccc0>] (platform_device_register_full+0xd0/0x110)
[   21.479836] [<c0c1ccc0>] (platform_device_register_full) from [<c104c130>] (rpi_firmware_probe+0x1a4/0x20c)
[   21.480061] [<c104c130>] (rpi_firmware_probe) from [<c0c1c4d0>] (platform_probe+0x5c/0xb8)
[   21.480255] [<c0c1c4d0>] (platform_probe) from [<c0c19d84>] (really_probe+0xf0/0x39c)
[   21.480437] [<c0c19d84>] (really_probe) from [<c0c1a098>] (driver_probe_device+0x68/0xc0)
[   21.480626] [<c0c1a098>] (driver_probe_device) from [<c0c17f54>] (bus_for_each_drv+0x84/0xc8)
[   21.480829] [<c0c17f54>] (bus_for_each_drv) from [<c0c19c20>] (__device_attach+0xec/0x158)
[   21.481018] [<c0c19c20>] (__device_attach) from [<c0c18de8>] (bus_probe_device+0x88/0x90)
[   21.481205] [<c0c18de8>] (bus_probe_device) from [<c0c192bc>] (deferred_probe_work_func+0x8c/0xbc)
[   21.481413] [<c0c192bc>] (deferred_probe_work_func) from [<c036802c>] (process_one_work+0x268/0x798)
[   21.481624] [<c036802c>] (process_one_work) from [<c0368774>] (worker_thread+0x218/0x4f4)
[   21.481822] [<c0368774>] (worker_thread) from [<c0370f28>] (kthread+0x140/0x174)
[   21.481999] [<c0370f28>] (kthread) from [<c030017c>] (ret_from_fork+0x14/0x38)
[   21.482185] Exception stack(0xc42b7fb0 to 0xc42b7ff8)

Updated bisect log is attached.

Guenter

---
# bad: [50b8b1d699ac313c0a07a3c185ffb23aecab8abb] Add linux-next specific files for 20210419
# good: [bf05bf16c76bb44ab5156223e1e58e26dfe30a88] Linux 5.12-rc8
git bisect start 'HEAD' 'v5.12-rc8'
# good: [c4bb91fc07e59241cde97f913d7a2fbedc248f0d] Merge remote-tracking branch 'crypto/master'
git bisect good c4bb91fc07e59241cde97f913d7a2fbedc248f0d
# good: [f15bbf170b40b48a43ed7076ce9f8ac9380e5752] Merge remote-tracking branch 'edac/edac-for-next'
git bisect good f15bbf170b40b48a43ed7076ce9f8ac9380e5752
# bad: [550a78090dcc4061e191312a757a127f0b6e6323] Merge remote-tracking branch 'vfio/next'
git bisect bad 550a78090dcc4061e191312a757a127f0b6e6323
# bad: [9f074d2a7bf49b2c9e1609703757b18de7611aef] Merge remote-tracking branch 'usb/usb-next'
git bisect bad 9f074d2a7bf49b2c9e1609703757b18de7611aef
# good: [855b2fdb7c543c94e7623e6ad0b492f04a5317db] Merge remote-tracking branch 'percpu/for-next'
git bisect good 855b2fdb7c543c94e7623e6ad0b492f04a5317db
# good: [1d08ed588c6a85a35a24c82eb4cf0807ec2b366a] usbip: vudc: fix missing unlock on error in usbip_sockfd_store()
git bisect good 1d08ed588c6a85a35a24c82eb4cf0807ec2b366a
# good: [1b7ce8fab5fd0c406dbf165b12d44b301decf589] Merge remote-tracking branch 'ipmi/for-next'
git bisect good 1b7ce8fab5fd0c406dbf165b12d44b301decf589
# good: [fe8e488058c47e9a8a2c85321f7198a0a17b0131] dt-bindings: usb: mtk-xhci: add wakeup interrupt
git bisect good fe8e488058c47e9a8a2c85321f7198a0a17b0131
# bad: [3c652132ce9052e626bf509932fcacfebed1ccb4] platform-msi: fix kernel-doc warnings
git bisect bad 3c652132ce9052e626bf509932fcacfebed1ccb4
# bad: [7f2fac70b729d68a34e5eba8d1fb68eb69b05169] device property: Add test cases for fwnode_property_count_*() APIs
git bisect bad 7f2fac70b729d68a34e5eba8d1fb68eb69b05169
# good: [38f087de8947700d3b06d3d1594490e0f611c5d1] devtmpfs: fix placement of complete() call
git bisect good 38f087de8947700d3b06d3d1594490e0f611c5d1
# good: [b6f617df4fa936c1ab1831c2b23563f6c1add6c4] driver core: Update device link status properly for device_bind_driver()
git bisect good b6f617df4fa936c1ab1831c2b23563f6c1add6c4
# bad: [6579c8d97ad7fc5671ee60234f3b8388abee5f77] clk: Mark fwnodes when their clock provider is added
git bisect bad 6579c8d97ad7fc5671ee60234f3b8388abee5f77
# good: [ea718c699055c8566eb64432388a04974c43b2ea] Revert "Revert "driver core: Set fw_devlink=on by default""
git bisect good ea718c699055c8566eb64432388a04974c43b2ea
# first bad commit: [6579c8d97ad7fc5671ee60234f3b8388abee5f77] clk: Mark fwnodes when their clock provider is added

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