Re: [PATCH] iio: adc: ad7949: use spi_is_bpw_supported()

[Jonathan Cameron <jic23@kernel.org>]

On Wed, 11 Jun 2025 12:00:27 -0500
David Lechner <dlechner@baylibre.com> wrote:

> On 6/11/25 11:55 AM, Jonathan Cameron wrote:
> > On Wed, 11 Jun 2025 10:21:56 -0500
> > David Lechner <dlechner@baylibre.com> wrote:
> >   
> >> On 6/11/25 10:15 AM, Andy Shevchenko wrote:  
> >>> On Wed, Jun 11, 2025 at 10:04:58AM -0500, David Lechner wrote:    
> >>>> Use spi_is_bpw_supported() instead of directly accessing spi->controller    
> >>>> ->bits_per_word_mask. bits_per_word_mask may be 0, which implies that    
> >>>> 8-bits-per-word is supported. spi_is_bpw_supported() takes this into
> >>>> account while spi_ctrl_mask == SPI_BPW_MASK(8) does not.    
> >>>     
> >>>> Closes: https://lore.kernel.org/linux-spi/c8b8a963-6cef-4c9b-bfef-dab2b7bd0b0f@sirena.org.uk/    
> >>>
> >>> Reported-by yourself. I'm wondering if the Closes adds a value in this case.
> >>> Otherwise I can do the same to maybe 10% of my patches, for instance. But
> >>> I don't think I put Closes tag on whatever improvement potential bug fix
> >>> I do report (read: notice) myself.    
> >>
> >> I included it so that Da Xue will know that this has been resolved and
> >> doesn't need to do anything more. Normally I would have not included
> >> it though.  
> > 
> > If I followed the discussion correctly does this need a fixes tag?  
> 
> I supposed it doesn't hurt. It could be possible that someone tries to
> use an older stable kernel with a SPI controller that didn't set the
> flags, in which case there could be a problem.
> 
> Fixes: 0b2a740b424e ("iio: adc: ad7949: enable use with non 14/16-bit controllers")
Applied to the fixes-togreg branch of iio.git.

I didn't mark it for stable purely because it would have been obvious
I think if anyone actually hit this.

Jonathan

> 
> >   
> >>  
> >>>     
> >>>> Signed-off-by: David Lechner <dlechner@baylibre.com>    
> >>>
> >>> Code wise LGTM,
> >>> Reviewed-by: Andy Shevchenko <andy@kernel.org>
> >>>     
> >>  
> >   
>