Re: [PATCH 06/11] spi-dw: Force error on out of range chip select.
From: Grant Likely
Date: Wed Jun 22 2011 - 23:52:13 EST
On Wed, Jun 22, 2011 at 8:00 PM, <dirk.brandewie@xxxxxxxxx> wrote:
> From: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
>
> BUG_ON() if the selected chip select is out of range.
>
> Signed-off-by: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
> ---
> 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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