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commit 89deb1334252ea4a8491d47654811e28b0790364 upstream
One of a class of bugs pointed out by Lars in a recent review.
iio_push_to_buffers_with_timestamp() assumes the buffer used is aligned
to the size of the timestamp (8 bytes). This is not guaranteed in
this driver which uses an array of smaller elements on the stack.
As Lars also noted this anti pattern can involve a leak of data to
userspace and that indeed can happen here. We close both issues by
moving to a suitable structure in the iio_priv() data.
This data is allocated with kzalloc() so no data can leak apart from
previous readings.
The explicit alignment of ts is not necessary in this case but
does make the code slightly less fragile so I have included it.
Fixes: 39631b5f9584 ("iio: Add Freescale mag3110 magnetometer driver")
Reported-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: <Stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200920112742.170751-4-jic23@kernel.org
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The driver doesn't have a struct of_device_id table but supported devices
are registered via Device Trees. This is working on the assumption that a
I2C device registered via OF will always match a legacy I2C device ID and
that the MODALIAS reported will always be of the form i2c:<device>.
But this could change in the future so the correct approach is to have an
OF device ID table if the devices are registered via OF.
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Driver was checking for direct mode but not locking it. Use
claim/release helper functions to guarantee the device stays
in direct mode during raw writes.
Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Acked-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Driver was checking for direct mode but not locking it. Use
claim/release helper functions to guarantee the device stays
in direct mode during raw reads.
Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Cc: Daniel Baluta <daniel.baluta@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Adds a new per-device sysfs attribute "current_timestamp_clock" to allow
userspace to select a particular POSIX clock for buffered samples and
events timestamping.
Following clocks, as listed in clock_gettime(2), are supported:
CLOCK_REALTIME, CLOCK_MONOTONIC, CLOCK_MONOTONIC_RAW,
CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE, CLOCK_BOOTTIME and
CLOCK_TAI.
Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Acked-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Place driver on standby mode on error in order to prevent wasting
power. Move standby function above to be seen by the new call.
Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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add IIO_CHAN_INFO_CALIBBIAS
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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DR bits need to be shifted; since MAG3110_CTRL_DR_DEFAULT is
zero, the change has no effect
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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drivers/iio/magnetometer/mag3110.c:197 mag3110_read_raw()
info: ignoring unreachable code.
drivers/iio/magnetometer/mag3110.c
185 case IIO_CHAN_INFO_SCALE:
186 switch (chan->type) {
187 case IIO_MAGN:
188 *val = 0;
189 *val2 = 1000;
190 return IIO_VAL_INT_PLUS_MICRO;
191 case IIO_TEMP:
192 *val = 1000;
193 return IIO_VAL_INT;
194 default:
195 return -EINVAL;
196 }
197 return IIO_VAL_INT_PLUS_MICRO;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
introduced by f9279d3a, mag3110: Scale factor missing
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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temperature is reported in milli-Celsius
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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need to print leading zeros, hence "%d.%06d"
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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buffer is enabled
individual reads are not permitted concurrently with buffered reads
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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The IIO_ST macro no longer covers all the elements of struct scan_type
and has this has lead to some bugs being introduced.
The drivers are easier to follow with this structure being directly
filled so that is now preferred.
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
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last argument of IIO_ST is shift, not endianness
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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three-axis digital magnetometer with I2C interface
datasheet is available from
http://cache.freescale.com/files/sensors/doc/data_sheet/MAG3110.pdf
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Jonathan Cameron
Javier Martinez Canillas
Alison Schofield
Gregor Boirie
Cristina Opriceana
Peter Meerwald
Jonathan Cameron