On 03-02-23, 16:18, Richard Fitzgerald wrote:
> On 03/02/2023 14:35, Pierre-Louis Bossart wrote:
> >
> >
> > On 2/2/23 09:42, Richard Fitzgerald wrote:
> > > Define the ch_mask argument of sdw_ch_mask_to_ch() as an unsigned
> > > so that the shift right is guaranteed to eventually make the
> > > value of ch_mask==0.
> > >
> > > Previously ch_mask was defined as a signed int, but a right
> > > shift of a signed value preserves the sign bit. So if the sign
> > > bit was 1, ch_mask would never become 0 and the for loop would
> > > be infinite.
> > > Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
> > > ---
> > > drivers/soundwire/bus.h | 2 +-
> > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h
> > > index 7631ef5e71fb..28bedc919b78 100644
> > > --- a/drivers/soundwire/bus.h
> > > +++ b/drivers/soundwire/bus.h
> > > @@ -160,7 +160,7 @@ int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
> > > u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf);
> > > /* Retrieve and return channel count from channel mask */
> > > -static inline int sdw_ch_mask_to_ch(int ch_mask)
> > > +static inline int sdw_ch_mask_to_ch(unsigned int ch_mask)
> > > {
> > > int c = 0;
> >
> > This patch1 is fine, but you remove this function in patch2, so is this
> > patch needed at all?
> >
> > -/* Retrieve and return channel count from channel mask */
> > -static inline int sdw_ch_mask_to_ch(unsigned int ch_mask)
> > -{
> > - int c = 0;
> > -
> > - for (c = 0; ch_mask; ch_mask >>= 1)
> > - c += ch_mask & 1;
> > -
> > - return c;
> > -}
> > -
>
> I'm happy to squash them, I did it in two steps so it didn't get
> overlooked that there's a bugfix happening.
I think this case is fine to squash and send as a single patch while
documenting that we are fixing the bug in the log
Thanks
--
~Vinod
