linux-kernel - Re: [PATCH v2] spi-topcliff-pch: fix -Wuninitialized warning

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Date:	Fri, 09 Mar 2012 14:43:37 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Danny Kukawka <danny.kukawka@...ect.de>
Cc:	Danny Kukawka <dkukawka@...e.de>, Jiri Kosina <trivial@...nel.org>,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] spi-topcliff-pch: fix -Wuninitialized warning

On Tue, 14 Feb 2012 15:35:03 +0100, Danny Kukawka <danny.kukawka@...ect.de> wrote:
> Fix for:
> drivers/spi/spi-topcliff-pch.c: In function ‘pch_spi_handler_sub’:
> drivers/spi/spi-topcliff-pch.c:325:17: warning: ‘bpw_len’ may be
>   used uninitialized in this function [-Wuninitialized]
> drivers/spi/spi-topcliff-pch.c:325:42: warning: ‘rx_index’ may be
>   used uninitialized in this function [-Wuninitialized]
> drivers/spi/spi-topcliff-pch.c:325:42: warning: ‘tx_index’ may be
>   used uninitialized in this function [-Wuninitialized]
> 
> Move usage of tx_index, rx_index and bpw_len into the same
> block as where they are set to prevent uninitialized usage.
> 
> v2: instead of init variables with 0 move the whole block
> 
> Signed-off-by: Danny Kukawka <danny.kukawka@...ect.de>

Applied, thanks

g.

> ---
>  drivers/spi/spi-topcliff-pch.c |   33 +++++++++++++++----------------
>  1 files changed, 17 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c
> index 10182eb..1107469 100644
> --- a/drivers/spi/spi-topcliff-pch.c
> +++ b/drivers/spi/spi-topcliff-pch.c
> @@ -318,22 +318,23 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
>  		data->tx_index = tx_index;
>  		data->rx_index = rx_index;
>  
> -	}
> -
> -	/* if transfer complete interrupt */
> -	if (reg_spsr_val & SPSR_FI_BIT) {
> -		if ((tx_index == bpw_len) && (rx_index == tx_index)) {
> -			/* disable interrupts */
> -			pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
> -
> -			/* transfer is completed;
> -			   inform pch_spi_process_messages */
> -			data->transfer_complete = true;
> -			data->transfer_active = false;
> -			wake_up(&data->wait);
> -		} else {
> -			dev_err(&data->master->dev,
> -				"%s : Transfer is not completed", __func__);
> +		/* if transfer complete interrupt */
> +		if (reg_spsr_val & SPSR_FI_BIT) {
> +			if ((tx_index == bpw_len) && (rx_index == tx_index)) {
> +				/* disable interrupts */
> +				pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
> +						   PCH_ALL);
> +
> +				/* transfer is completed;
> +				   inform pch_spi_process_messages */
> +				data->transfer_complete = true;
> +				data->transfer_active = false;
> +				wake_up(&data->wait);
> +			} else {
> +				dev_err(&data->master->dev,
> +					"%s : Transfer is not completed",
> +					__func__);
> +			}
>  		}
>  	}
>  }
> -- 
> 1.7.7.3
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies,Ltd.
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