On 27/11/15 13:55, Lars-Peter Clausen wrote:
> The SPI tx and rx buffers are both supposed to be scan_bytes amount of
> bytes large and a common allocation is used to allocate both buffers. This
> puts the beginning of the tx buffer scan_bytes bytes after the rx buffer.
> The initialization of the tx buffer pointer is done adding scan_bytes to
> the beginning of the rx buffer, but since the rx buffer is of type __be16
> this will actually add two times as much and the tx buffer ends up pointing
> after the allocated buffer.
>
> Fix this by using scan_count, which is scan_bytes / 2, instead of
> scan_bytes when initializing the tx buffer pointer.
>
> Fixes: aacff892cbd5 ("staging:iio:adis: Preallocate transfer message")
> Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Applied to my local fixes branch - will push out once Greg has caught
up with last pull request - don't want to muddy the waters!
Jonathan
> ---
> Apologies if you got this twice, forgot the mailinglist on the first try.
> ---
> drivers/iio/imu/adis_buffer.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iio/imu/adis_buffer.c b/drivers/iio/imu/adis_buffer.c
> index cb32b59..36607d5 100644
> --- a/drivers/iio/imu/adis_buffer.c
> +++ b/drivers/iio/imu/adis_buffer.c
> @@ -43,7 +43,7 @@ int adis_update_scan_mode(struct iio_dev *indio_dev,
> return -ENOMEM;
>
> rx = adis->buffer;
> - tx = rx + indio_dev->scan_bytes;
> + tx = rx + scan_count;
>
> spi_message_init(&adis->msg);
>
>
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