linux-kernel - Re: [PATCH v2 1/3] mtd: spi-nor: stm32-quadspi: Fix uninitialized error return code

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Date:   Mon, 30 Oct 2017 09:05:03 +0100
From:   Ludovic BARRE <ludovic.barre@...com>
To:     Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Marek Vasut <marek.vasut@...il.com>
CC:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v2 1/3] mtd: spi-nor: stm32-quadspi: Fix uninitialized
 error return code

thanks Cyrille

indeed, the "Signed-off" on Geert'commit was a mistake

BR
Ludo
On 10/29/2017 06:50 PM, Cyrille Pitchen wrote:
> Hi Ludovic,
> 
> Le 26/10/2017 à 17:12, Ludovic Barre a écrit :
>> From: Geert Uytterhoeven <geert@...ux-m68k.org>
>>
>> With gcc 4.1.2:
>>
>>      drivers/mtd/spi-nor/stm32-quadspi.c: In function ‘stm32_qspi_tx_poll’:
>>      drivers/mtd/spi-nor/stm32-quadspi.c:230: warning: ‘ret’ may be used uninitialized in this function
>>
>> Indeed, if stm32_qspi_cmd.len is zero, ret will be uninitialized.
>> This length is passed from outside the driver using the
>> spi_nor.{read,write}{,_reg}() callbacks.
>>
>> Several functions in drivers/mtd/spi-nor/spi-nor.c (e.g. write_enable(),
>> write_disable(), and erase_chip()) call spi_nor.write_reg() with a zero
>> length.
>>
>> Fix this by returning an explicit zero on success.
>>
>> Fixes: 0d43d7ab277a048c ("mtd: spi-nor: add driver for STM32 quad spi flash controller")
>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>> Acked-by: Ludovic Barre <ludovic.barre@...com>
>> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
> I removed your "Signed-off" because I think this is a mistake but kept
> your "Acked-by" tag.
> 
> Applied to the spi-nor/next branch of l2-mtd.
> 
> Thanks!
> 
>> ---
>>   drivers/mtd/spi-nor/stm32-quadspi.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mtd/spi-nor/stm32-quadspi.c b/drivers/mtd/spi-nor/stm32-quadspi.c
>> index 86c0931..ad6a3e1 100644
>> --- a/drivers/mtd/spi-nor/stm32-quadspi.c
>> +++ b/drivers/mtd/spi-nor/stm32-quadspi.c
>> @@ -240,12 +240,12 @@ static int stm32_qspi_tx_poll(struct stm32_qspi *qspi,
>>   						 STM32_QSPI_FIFO_TIMEOUT_US);
>>   		if (ret) {
>>   			dev_err(qspi->dev, "fifo timeout (stat:%#x)\n", sr);
>> -			break;
>> +			return ret;
>>   		}
>>   		tx_fifo(buf++, qspi->io_base + QUADSPI_DR);
>>   	}
>>   
>> -	return ret;
>> +	return 0;
>>   }
>>   
>>   static int stm32_qspi_tx_mm(struct stm32_qspi *qspi,
>>
>