Re: [PATCH] iio: buffer: hw-consumer: free scan_mask on buffer release

[Nuno Sá]

On Mon, Apr 27, 2026 at 07:11:39PM +0800, Felix Gu wrote:
> The scan_mask lifetime changed in commit 9a2e1233d38c ("iio: buffer:
> hw-consumer: remove redundant scan_mask flexible array").
> 
> Before that change, the scan mask storage was embedded in struct
> hw_consumer_buffer, so iio_hw_buf_release() could free the whole
> allocation with a single kfree(hw_buf).
> 
> That commit moved the scan mask to a separate bitmap_zalloc() allocation
> stored in buffer.scan_mask, but left iio_hw_buf_release() unchanged.
> 
> Free the scan mask in iio_hw_buf_release() before freeing the buffer
> wrapper.
> 
> Fixes: 9a2e1233d38c ("iio: buffer: hw-consumer: remove redundant scan_mask flexible array")
> Signed-off-by: Felix Gu <ustc.gu@xxxxxxxxx>
> ---

For some reason this one did not get into my mailbox. Anyways, looks
good and in line with buffer-cb. Thanks for fixing this:

Reviewed-by: Nuno Sá <nuno.sa@xxxxxxxxxx>

>  drivers/iio/buffer/industrialio-hw-consumer.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/iio/buffer/industrialio-hw-consumer.c b/drivers/iio/buffer/industrialio-hw-consumer.c
> index 24d7df603760..d1ab2cbf8c88 100644
> --- a/drivers/iio/buffer/industrialio-hw-consumer.c
> +++ b/drivers/iio/buffer/industrialio-hw-consumer.c
> @@ -40,6 +40,8 @@ static void iio_hw_buf_release(struct iio_buffer *buffer)
>  {
>  	struct hw_consumer_buffer *hw_buf =
>  		iio_buffer_to_hw_consumer_buffer(buffer);
> +
> +	bitmap_free(buffer->scan_mask);
>  	kfree(hw_buf);
>  }
>  
> 
> ---
> base-commit: 7080e32d3f09d8688c4a87d81bdcc71f7f606b16
> change-id: 20260427-iio_buf-0459b3fa3de8
> 
> Best regards,
> -- 
> Felix Gu <ustc.gu@xxxxxxxxx>
>