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Date: Fri, 19 Feb 2016 00:13:43 +0100 From: Peter Rosin <peda@...ator.liu.se> To: Dirk Eibach <eibach@...ys.de> CC: Peter Rosin <peda@...ntia.se>, Jean Delvare <jdelvare@...e.de>, Guenter Roeck <linux@...ck-us.net>, lm-sensors@...sensors.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] hwmon: (ads1015) Handle negative conversion values correctly Hi! Sorry for the noise, but... On 2016-02-18 14:07, Peter Rosin wrote: > From: Peter Rosin <peda@...ntia.se> > > Make the divisor signed as DIV_ROUND_CLOSEST is undefined for negative > dividends when the divisor is unsigned. > > Signed-off-by: Peter Rosin <peda@...ntia.se> ...I forgot to add this to the commit message Cc: stable@...r.kernel.org I also didn't explicitly mention any example platform where this bug causes real problems; it was triggered on ARM (atmel sama5d). Cheers, Peter > --- > drivers/hwmon/ads1015.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/hwmon/ads1015.c b/drivers/hwmon/ads1015.c > index f155b8380481..2b3105c8aed3 100644 > --- a/drivers/hwmon/ads1015.c > +++ b/drivers/hwmon/ads1015.c > @@ -126,7 +126,7 @@ static int ads1015_reg_to_mv(struct i2c_client *client, unsigned int channel, > struct ads1015_data *data = i2c_get_clientdata(client); > unsigned int pga = data->channel_data[channel].pga; > int fullscale = fullscale_table[pga]; > - const unsigned mask = data->id == ads1115 ? 0x7fff : 0x7ff0; > + const int mask = data->id == ads1115 ? 0x7fff : 0x7ff0; > > return DIV_ROUND_CLOSEST(reg * fullscale, mask); > } >
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