linux-kernel - Re: [PATCH] mtd: spi-nor: cadence-quadspi: make return type fit wait_for_completion

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Date:   Tue, 24 Jul 2018 22:46:26 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Nicholas Mc Guire <hofrat@...dl.org>
Cc:     Graham Moore <grmoore@...nsource.altera.com>,
        Vignesh R <vigneshr@...com>,
        Richard Weinberger <richard@....at>,
        linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
        linux-mtd@...ts.infradead.org,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] mtd: spi-nor: cadence-quadspi: make return type fit
 wait_for_completion_timeout

On Sat, 21 Jul 2018 18:08:13 +0200
Nicholas Mc Guire <hofrat@...dl.org> wrote:

> wait_for_completion_timeout returns an unsigned long not int. declare a
> suitably type timeout and fix up assignment and check.
> 
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
> Reported-by: Vignesh R <vigneshr@...com>
> Fixes: 140623410536 ("mtd: spi-nor: Add driver for Cadence Quad SPI Flash Controller")

If you don't mind, I'd like to squash all wait_for_completion_timeout()
fixes into a single commit.

Thanks,

Boris

> ---
> 
> Given that CQSPI_TIMEOUT_MS is < INT_MAX the type conversion is actually safe
> here but it is cleaner to use proper types.
> 
> Patch was compile tested with: socfpga_defconfig (implies
> CONFIG_SPI_CADENCE_QUADSPI=y)
> 
> Patch is against 4.18-rc5 (localversion-next is next-20180720)
> 
>  drivers/mtd/spi-nor/cadence-quadspi.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
> index d7e10b3..ce5f840 100644
> --- a/drivers/mtd/spi-nor/cadence-quadspi.c
> +++ b/drivers/mtd/spi-nor/cadence-quadspi.c
> @@ -622,6 +622,7 @@ static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
>  	unsigned int remaining = n_tx;
>  	unsigned int write_bytes;
>  	int ret;
> +	unsigned long timeout;
>  
>  	writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
>  	writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES);
> @@ -649,10 +650,10 @@ static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
>  		iowrite32_rep(cqspi->ahb_base, txbuf,
>  			      DIV_ROUND_UP(write_bytes, 4));
>  
> -		ret = wait_for_completion_timeout(&cqspi->transfer_complete,
> -						  msecs_to_jiffies
> -						  (CQSPI_TIMEOUT_MS));
> -		if (!ret) {
> +		timeout = wait_for_completion_timeout(&cqspi->transfer_complete,
> +						      msecs_to_jiffies
> +						      (CQSPI_TIMEOUT_MS));
> +		if (!timeout) {
>  			dev_err(nor->dev, "Indirect write timeout\n");
>  			ret = -ETIMEDOUT;
>  			goto failwr;