linux-kernel - Re: [PATCH v2 14/22] watchdog: ziirave_wdt: Don't try to program readonly flash

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Message-ID: <20190815182133.GJ14388@roeck-us.net>
Date:   Thu, 15 Aug 2019 11:21:33 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     linux-watchdog@...r.kernel.org, Chris Healy <cphealy@...il.com>,
        Rick Ramstetter <rick@...eaterllc.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 14/22] watchdog: ziirave_wdt: Don't try to program
 readonly flash

On Mon, Aug 12, 2019 at 01:08:58PM -0700, Andrey Smirnov wrote:
> Bootloader code will ignore any attempts to write data to any flash
> area outside of [ZIIRAVE_FIRM_FLASH_MEMORY_START;
> ZIIRAVE_FIRM_FLASH_MEMORY_END]. Firmware update code already have an
> appropriate check to skip those areas when validating updated
> firmware. Firmware programming code, OTOH, does not and will
> needlessly send no-op I2C traffic. Add an appropriate check to
> __ziirave_firm_write_pkt() so as to save all of that wasted effort.
> 
> While at it, normalize all of the address handling code to use full
> 32-bit address in units of bytes and convert it to an appropriate
> value only in places where that is necessary.
> 
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Rick Ramstetter <rick@...eaterllc.com>
> Cc: linux-watchdog@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org

Reviewed-by: Guenter Roeck <linux@...ck-us.net>