linux-kernel - Re: [PATCH] iio: imu: st_lsm6dsx: Fix check for invalid samples from FIFO

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Message-ID: <aXDLtKbJaDHbTaz5@smile.fi.intel.com>
Date: Wed, 21 Jan 2026 14:51:00 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Francesco Lavra <flavra@...libre.com>
Cc: Lorenzo Bianconi <lorenzo@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: imu: st_lsm6dsx: Fix check for invalid samples from
 FIFO

On Wed, Jan 21, 2026 at 02:47:40PM +0200, Andy Shevchenko wrote:
> On Wed, Jan 21, 2026 at 12:27:57PM +0100, Francesco Lavra wrote:

...

> >  st_lsm6dsx_push_tagged_data(struct st_lsm6dsx_hw *hw, u8 tag,
> >  			    u8 *data, s64 ts)
> >  {
> > -	s16 val = le16_to_cpu(*(__le16 *)data);
> >  	struct st_lsm6dsx_sensor *sensor;
> >  	struct iio_dev *iio_dev;
> >  
> >  	/* invalid sample during bootstrap phase */
> > -	if (val >= ST_LSM6DSX_INVALID_SAMPLE)
> > +	if ((tag == ST_LSM6DSX_GYRO_TAG || tag == ST_LSM6DSX_ACC_TAG) &&
> > +	    (s16)le16_to_cpup((__le16 *)data) >= ST_LSM6DSX_INVALID_SAMPLE)
> 
> Since data is u8 *, it might appear on unaligned addresses and the proper
> conversion here is to use get_unaligned_le16() without any of those ugly
> castings.

Okay, (s16) seems needed or another way to allow 0x8000 and higher values.

> >  		return -EINVAL;

-- 
With Best Regards,
Andy Shevchenko