linux-kernel - Re: [PATCH] staging: pi433: Fixes issue with bit shift in rf69_get

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Message-ID: <20171206142305.GA15920@kroah.com>
Date:   Wed, 6 Dec 2017 15:23:05 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Marcus Wolf <marcus.wolf@...rthome-wolf.de>
Cc:     Marcus Wolf <linux@...f-entwicklungen.de>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        dan.carpenter@...cle.com
Subject: Re: [PATCH] staging: pi433: Fixes issue with bit shift in
 rf69_get_modulation

On Wed, Dec 06, 2017 at 12:02:13PM +0200, Marcus Wolf wrote:
> 
> 
> Am 06.12.2017 um 11:02 schrieb Greg KH:
> > On Wed, Nov 08, 2017 at 07:13:56PM +0200, Marcus Wolf wrote:
> > > Fixes issue with bit shift in rf69_get_modulation
> > 
> > What "issue"?
> > 
> > > 
> > > Signed-off-by: Marcus Wolf <linux@...f-entwicklungen.de>
> > > ---
> > >   drivers/staging/pi433/rf69.c |    2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/staging/pi433/rf69.c b/drivers/staging/pi433/rf69.c
> > > index 290b419..c945b4b 100644
> > > --- a/drivers/staging/pi433/rf69.c
> > > +++ b/drivers/staging/pi433/rf69.c
> > > @@ -102,7 +102,7 @@ enum modulation rf69_get_modulation(struct spi_device *spi)
> > >   	currentValue = READ_REG(REG_DATAMODUL);
> > > -	switch (currentValue & MASK_DATAMODUL_MODULATION_TYPE >> 3) { // TODO improvement: change 3 to define
> > > +	switch (currentValue & MASK_DATAMODUL_MODULATION_TYPE) {
> > 
> > Doesn't this change the logic here?
> > 
> > thanks,
> > 
> > greg k-h
> > 
> 
> Hi Greg,
> 
> yes, it does.
> 
> This is one of the very few changes to pi433 driver, that does not modify
> the architecture or optics of the code, but really fixes a bug. This
> function wasn't working from the very beginning, and we had already several
> reports and patches (from me and otheres), announcing or trying to fix the
> bug. But so far all patches were skipped for some reason.
> 
> 
> Please take the patch.

Ok, then this should go into 4.15-final, I'll queue it up to that tree.

thanks,

greg k-h