linux-kernel - Re: [PATCH 4.14 056/109] clk: ti: clkctrl: add support for retrying failed init

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Date:   Mon, 19 Mar 2018 11:44:08 +0800
From:   Dan Rue <dan.rue@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Tero Kristo <t-kristo@...com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: Re: [PATCH 4.14 056/109] clk: ti: clkctrl: add support for retrying
 failed init

On Fri, Mar 16, 2018 at 04:23:25PM +0100, Greg Kroah-Hartman wrote:
> 4.14-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Tero Kristo <t-kristo@...com>
> 
> 
> [ Upstream commit 729e13bf58e643b9accd2a14c55b555958702fb0 ]
> 
> In case the clkctrl node contains assigned-clock-* entries, registering
> the provider can fail with -EPROBE_DEFER. In this case, add the
> provider to the retry_init clock list so it will be cleaned up later.
> 
> Signed-off-by: Tero Kristo <t-kristo@...com>
> Acked-by: Stephen Boyd <sboyd@...eaurora.org>
> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This fails to build for me on arm32:

$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=build-arm multi_v7_defconfig
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=build-arm

...

../drivers/clk/ti/clkctrl.c: In function ‘_ti_omap4_clkctrl_setup’:
../drivers/clk/ti/clkctrl.c:497:27: error: passing argument 2 of ‘ti_clk_retry_init’ from incompatible pointer type
 [-Werror=incompatible-pointer-types]
   ti_clk_retry_init(node, provider, _clkctrl_add_provider);
                           ^~~~~~~~
In file included from ../drivers/clk/ti/clkctrl.c:24:0:
../drivers/clk/ti/clock.h:265:5: note: expected ‘struct clk_hw *’ but argument is of type ‘struct omap_clkctrl_prov
ider *’
 int ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
     ^~~~~~~~~~~~~~~~~                                                                                             ../drivers/clk/ti/clkctrl.c:497:37: error: passing argument 3 of ‘ti_clk_retry_init’ from incompatible pointer type
 [-Werror=incompatible-pointer-types]
   ti_clk_retry_init(node, provider, _clkctrl_add_provider);
                                     ^~~~~~~~~~~~~~~~~~~~~
In file included from ../drivers/clk/ti/clkctrl.c:24:0:                                                            ../drivers/clk/ti/clock.h:265:5: note: expected ‘ti_of_clk_init_cb_t {aka void (*)(struct clk_hw *, struct device_n
ode *)}’ but argument is of type ‘void (*)(void *, struct device_node *)’
 int ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
     ^~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[4]: *** [../scripts/Makefile.build:329: drivers/clk/ti/clkctrl.o] Error 1
make[3]: *** [../scripts/Makefile.build:587: drivers/clk/ti] Error 2
make[2]: *** [../scripts/Makefile.build:587: drivers/clk] Error 2
make[1]: *** [/home/drue/src/linux/4.14-rc/Makefile:1031: drivers] Error 2
make[1]: Leaving directory '/home/drue/src/linux/4.14-rc/build-arm'
make: *** [Makefile:146: sub-make] Error 2

> ---
>  drivers/clk/ti/clkctrl.c |   12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> --- a/drivers/clk/ti/clkctrl.c
> +++ b/drivers/clk/ti/clkctrl.c
> @@ -400,6 +400,12 @@ _ti_clkctrl_setup_subclks(struct omap_cl
>  	}
>  }
>  
> +static void __init _clkctrl_add_provider(void *data,
> +					 struct device_node *np)
> +{
> +	of_clk_add_hw_provider(np, _ti_omap4_clkctrl_xlate, data);
> +}
> +
>  static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
>  {
>  	struct omap_clkctrl_provider *provider;
> @@ -411,6 +417,7 @@ static void __init _ti_omap4_clkctrl_set
>  	struct omap_clkctrl_clk *clkctrl_clk;
>  	const __be32 *addrp;
>  	u32 addr;
> +	int ret;
>  
>  	addrp = of_get_address(node, 0, NULL, NULL);
>  	addr = (u32)of_translate_address(node, addrp);
> @@ -485,7 +492,10 @@ static void __init _ti_omap4_clkctrl_set
>  		reg_data++;
>  	}
>  
> -	of_clk_add_hw_provider(node, _ti_omap4_clkctrl_xlate, provider);
> +	ret = of_clk_add_hw_provider(node, _ti_omap4_clkctrl_xlate, provider);
> +	if (ret == -EPROBE_DEFER)
> +		ti_clk_retry_init(node, provider, _clkctrl_add_provider);
> +
>  	return;
>  
>  cleanup:
> 
>