On Tue, 8 Oct 2019 11:02:39 +0300
Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> wrote:
> The `state_lock` mutex was renamed from `txrx_lock` in a previous patch and
> is intended to be used by ADIS drivers to protect the state of devices
> during consecutive R/W ops.
> The initial patch that introduced this change did not do a good [well, any]
> job at explaining this. This patch adds a comment to the `state_lock`
> better explaining it's use.
>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
Tiny tweak. See below.
Applied to the togreg branch of iio.git and pushed out as testing.
One thing to note though. I don't normally run kernel-doc on random
headers, and my eyes missed it, but there are errors in the docs
for read and write functions that could do with fixing.
[jic23@archlinux iio]$ ./scripts/kernel-doc include/linux/iio/imu/adis.h > temp.html
include/linux/iio/imu/adis.h:138: warning: Function parameter or member 'val' not described in '__adis_write_reg_8'
include/linux/iio/imu/adis.h:138: warning: Excess function parameter 'value' description in '__adis_write_reg_8'
include/linux/iio/imu/adis.h:150: warning: Function parameter or member 'val' not described in '__adis_write_reg_16'
include/linux/iio/imu/adis.h:150: warning: Excess function parameter 'value' description in '__adis_write_reg_16'
include/linux/iio/imu/adis.h:162: warning: Function parameter or member 'val' not described in '__adis_write_reg_32'
include/linux/iio/imu/adis.h:162: warning: Excess function parameter 'value' description in '__adis_write_reg_32'
include/linux/iio/imu/adis.h:217: warning: Function parameter or member 'val' not described in 'adis_write_reg'
include/linux/iio/imu/adis.h:217: warning: Excess function parameter 'value' description in 'adis_write_reg'
include/linux/iio/imu/adis.h:254: warning: Function parameter or member 'val' not described in 'adis_write_reg_8'
include/linux/iio/imu/adis.h:254: warning: Excess function parameter 'value' description in 'adis_write_reg_8'
include/linux/iio/imu/adis.h:266: warning: Function parameter or member 'val' not described in 'adis_write_reg_16'
include/linux/iio/imu/adis.h:266: warning: Excess function parameter 'value' description in 'adis_write_reg_16'
include/linux/iio/imu/adis.h:278: warning: Function parameter or member 'val' not described in 'adis_write_reg_32'
include/linux/iio/imu/adis.h:278: warning: Excess function parameter 'value' description in 'adis_write_reg_32'
If you could role a patch for those, that would be great. Thanks!
Thanks,
Jonathan
> ---
> include/linux/iio/imu/adis.h | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
> index 27ebd740f626..abd4bd07e960 100644
> --- a/include/linux/iio/imu/adis.h
> +++ b/include/linux/iio/imu/adis.h
> @@ -80,6 +80,17 @@ struct adis {
> const struct adis_data *data;
> struct adis_burst *burst;
>
> + /**
This isn't kernel doc so
/*
I'll fix.
> + * The state_lock is meant to be used during operations that require
> + * a sequence of SPI R/W in order to protect the SPI transfer
> + * information (fields 'xfer', 'msg' & 'current_page') between
> + * potential concurrent accesses.
> + * This lock is used by all "adis_{functions}" that have to read/write
> + * registers. These functions also have unlocked variants
> + * (see "__adis_{functions}"), which don't hold this lock.
> + * This allows users of the ADIS library to group SPI R/W into
> + * the drivers, but they also must manage this lock themselves.
> + */
> struct mutex state_lock;
> struct spi_message msg;
> struct spi_transfer *xfer;
