linux-kernel - Re: [PATCH v4 05/13] pm: at91: move the copying the sram function to the sram initializationi phase

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Date:	Thu, 29 Jan 2015 11:28:00 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Wenyou Yang <wenyou.yang@...el.com>
Cc:	nicolas.ferre@...el.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, alexandre.belloni@...e-electrons.com,
	sylvain.rochet@...secur.com, peda@...ntia.se,
	sergei.shtylyov@...entembedded.com, linux@...im.org.za
Subject: Re: [PATCH v4 05/13] pm: at91: move the copying the sram function to
 the sram initializationi phase

On Wed, Jan 28, 2015 at 09:43:16AM +0800, Wenyou Yang wrote:
> -#ifdef CONFIG_AT91_SLOW_CLOCK
> -				/* copy slow_clock handler to SRAM, and call it */
> -				memcpy(slow_clock, at91_slow_clock, at91_slow_clock_sz);
> -#endif
>  				slow_clock(at91_pmc_base, at91_ramc_base[0],
>  					   at91_ramc_base[1],
>  					   at91_pm_data.memctrl);
> @@ -272,6 +268,9 @@ static void __init at91_pm_sram_init(void)
>  	sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base);
>  	slow_clock = __arm_ioremap_exec(sram_pbase, at91_slow_clock_sz, false);
>  
> +	/* Copy the slow_clock handler to SRAM */
> +	memcpy(slow_clock, at91_slow_clock, at91_slow_clock_sz);
> +

Why is this code not using the fncpy() support for copying functions.
Why is it not checking the return code from __arm_ioremap_exec() or
gen_pool_virt_to_phys() for failure?

This looks like quite a massive review failure when this code was
originally merged.  It needs fixing.

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