On Wed, Feb 10, 2021 at 01:44:34PM +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@xxxxxxxxxxxxx>
> Reviewed-by: Saravana Kannan <saravanak@xxxxxxxxxx>
> ---
> drivers/clk/clk.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 27ff90eacb1f..9370e4dfecae 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -4594,6 +4594,8 @@ int of_clk_add_hw_provider(struct device_node *np,
> if (ret < 0)
> of_clk_del_provider(np);
>
> + fwnode_dev_initialized(&np->fwnode, true);
> +
This causes a crash when booting raspi2 images in qemu.
[ 22.123618] Unable to handle kernel NULL pointer dereference at virtual address 00000028
[ 22.123830] pgd = (ptrval)
[ 22.123992] [00000028] *pgd=00000000
[ 22.124579] Internal error: Oops: 5 [#1] SMP ARM
...
[ 22.141624] [<c0a2f4d8>] (of_clk_add_hw_provider) from [<c0a2f54c>] (devm_of_clk_add_hw_provider+0x48/0x80)
[ 22.141819] [<c0a2f54c>] (devm_of_clk_add_hw_provider) from [<c0a43ad8>] (raspberrypi_clk_probe+0x25c/0x384)
[ 22.141976] [<c0a43ad8>] (raspberrypi_clk_probe) from [<c0c18da0>] (platform_probe+0x5c/0xb8)
[ 22.142114] [<c0c18da0>] (platform_probe) from [<c0c16654>] (really_probe+0xf0/0x39c)
[ 22.142246] [<c0c16654>] (really_probe) from [<c0c16968>] (driver_probe_device+0x68/0xc0)
[ 22.142377] [<c0c16968>] (driver_probe_device) from [<c0c14834>] (bus_for_each_drv+0x84/0xc8)...
np can (and will) be NULL here. See of_clk_set_defaults().
Guenter
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# good: [ea718c699055c8566eb64432388a04974c43b2ea] Revert "Revert "driver core: Set fw_devlink=on by default""
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# bad: [6579c8d97ad7fc5671ee60234f3b8388abee5f77] clk: Mark fwnodes when their clock provider is added
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# first bad commit: [6579c8d97ad7fc5671ee60234f3b8388abee5f77] clk: Mark fwnodes when their clock provider is added
