linux-kernel - Re: [PATCH 02/16] Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 20 Nov 2008 12:25:59 -0800
From:	David Brownell <david-b@...bell.net>
To:	Bryan Wu <cooloney@...nel.org>
Cc:	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Michael Hennerich <michael.hennerich@...log.com>
Subject: Re: [PATCH 02/16] Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation

On Monday 17 November 2008, Bryan Wu wrote:
> From: Michael Hennerich <michael.hennerich@...log.com>
> 
> Fix erroneous SPI Clock divisor calculation. Make sure SPI_BAUD is
> always >= 2. Writing a value of 0 or 1 to the SPI_BAUD register disables
> the serial clock.
> 
> Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
> Signed-off-by: Bryan Wu <cooloney@...nel.org>

Acked-by: David Brownell <dbrownell@...rs.sourceforge.net>

> ---
>  arch/blackfin/include/asm/bfin5xx_spi.h |    2 ++
>  drivers/spi/spi_bfin5xx.c               |    3 +++
>  2 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/blackfin/include/asm/bfin5xx_spi.h b/arch/blackfin/include/asm/bfin5xx_spi.h
> index 9fa1915..b16c3cd 100644
> --- a/arch/blackfin/include/asm/bfin5xx_spi.h
> +++ b/arch/blackfin/include/asm/bfin5xx_spi.h
> @@ -21,6 +21,8 @@
>  #ifndef _SPI_CHANNEL_H_
>  #define _SPI_CHANNEL_H_
>  
> +#define MIN_SPI_BAUD_VAL	2
> +
>  #define SPI_READ              0
>  #define SPI_WRITE             1
>  
> diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
> index e9b7366..a38106a 100644
> --- a/drivers/spi/spi_bfin5xx.c
> +++ b/drivers/spi/spi_bfin5xx.c
> @@ -158,6 +158,9 @@ static u16 hz_to_spi_baud(u32 speed_hz)
>  	if ((sclk % (2 * speed_hz)) > 0)
>  		spi_baud++;
>  
> +	if (spi_baud < MIN_SPI_BAUD_VAL)
> +		spi_baud = MIN_SPI_BAUD_VAL;
> +
>  	return spi_baud;
>  }
>  
> -- 
> 1.5.6.3
> 
> 


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/