linux-kernel - Re: [PATCH 06/11] spi-dw: Force error on out of range chip select.

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Date:	Wed, 22 Jun 2011 21:51:45 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	dirk.brandewie@...il.com
Cc:	linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net
Subject: Re: [PATCH 06/11] spi-dw: Force error on out of range chip select.

On Wed, Jun 22, 2011 at 8:00 PM,  <dirk.brandewie@...il.com> wrote:
> From: Dirk Brandewie <dirk.brandewie@...il.com>
>
> BUG_ON() if the selected chip select is out of range.
>
> Signed-off-by: Dirk Brandewie <dirk.brandewie@...il.com>
> ---
>  drivers/spi/spi-dw.h |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
> index 860bc34..3fa4c13 100644
> --- a/drivers/spi/spi-dw.h
> +++ b/drivers/spi/spi-dw.h
> @@ -178,8 +178,7 @@ static inline void spi_dw_set_clk(struct spi_dw *dws, u16 div)
>
>  static inline void spi_dw_chip_sel(struct spi_dw *dws, u16 cs)
>  {
> -       if (cs > dws->num_cs)
> -               return;
> +       BUG_ON(cs >= dws->master->num_chipselect);

BUG is rather an over-reaction.  The transfer should be rejected if
the cs# is invalid, and a warning message is appropriate, but BUG() is
too extreme.

g.
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