linux-kernel - Re: [PATCH 2/3] media: usb: pvrusb2: Fix Wcast-function-type-strict warnings

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Date: Thu, 1 Feb 2024 15:09:26 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>, Mike Isely <isely@...ox.com>,
	Tiffany Lin <tiffany.lin@...iatek.com>,
	Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
	Yunfei Dong <yunfei.dong@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/3] media: usb: pvrusb2: Fix Wcast-function-type-strict
 warnings

On Sun, Jan 28, 2024 at 02:12:21AM +0000, Ricardo Ribalda wrote:
> Building with LLVM=1 throws the following warning:
> drivers/media/usb/pvrusb2/pvrusb2-context.c:110:6: warning: cast from 'void (*)(struct pvr2_context *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
> drivers/media/usb/pvrusb2/pvrusb2-v4l2.c:1070:30: warning: cast from 'void (*)(struct pvr2_v4l2_fh *)' to 'pvr2_stream_callback' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict] drivers/media/usb/pvrusb2/pvrusb2-dvb.c:152:6: warning: cast from 'void (*)(struct pvr2_dvb_adapter *)' to 'pvr2_stream_callback' (aka 'void (*)(void *)') converts to incompatible function type [-Wcast-function-type-strict]
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>  drivers/media/usb/pvrusb2/pvrusb2-context.c | 5 +++--
>  drivers/media/usb/pvrusb2/pvrusb2-dvb.c     | 7 ++++---
>  drivers/media/usb/pvrusb2/pvrusb2-v4l2.c    | 7 ++++---
>  3 files changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/media/usb/pvrusb2/pvrusb2-context.c b/drivers/media/usb/pvrusb2/pvrusb2-context.c
> index 1764674de98b..16edabda191c 100644
> --- a/drivers/media/usb/pvrusb2/pvrusb2-context.c
> +++ b/drivers/media/usb/pvrusb2/pvrusb2-context.c
> @@ -90,8 +90,9 @@ static void pvr2_context_destroy(struct pvr2_context *mp)
>  }
>  
>  
> -static void pvr2_context_notify(struct pvr2_context *mp)
> +static void pvr2_context_notify(void *data)
>  {
> +	struct pvr2_context *mp = data;
>  	pvr2_context_set_notify(mp,!0);
>  }
>  
> @@ -107,7 +108,7 @@ static void pvr2_context_check(struct pvr2_context *mp)
>  			   "pvr2_context %p (initialize)", mp);
>  		/* Finish hardware initialization */
>  		if (pvr2_hdw_initialize(mp->hdw,
> -					(void (*)(void *))pvr2_context_notify,
> +					pvr2_context_notify,
>  					mp)) {
>  			mp->video_stream.stream =
>  				pvr2_hdw_get_video_stream(mp->hdw);
> diff --git a/drivers/media/usb/pvrusb2/pvrusb2-dvb.c b/drivers/media/usb/pvrusb2/pvrusb2-dvb.c
> index 26811efe0fb5..8b9f1a09bd53 100644
> --- a/drivers/media/usb/pvrusb2/pvrusb2-dvb.c
> +++ b/drivers/media/usb/pvrusb2/pvrusb2-dvb.c
> @@ -88,8 +88,9 @@ static int pvr2_dvb_feed_thread(void *data)
>  	return stat;
>  }
>  
> -static void pvr2_dvb_notify(struct pvr2_dvb_adapter *adap)
> +static void pvr2_dvb_notify(void *data)
>  {
> +	struct pvr2_dvb_adapter *adap = data;
>  	wake_up(&adap->buffer_wait_data);
>  }
>  
> @@ -148,8 +149,8 @@ static int pvr2_dvb_stream_do_start(struct pvr2_dvb_adapter *adap)
>  		if (!(adap->buffer_storage[idx])) return -ENOMEM;
>  	}
>  
> -	pvr2_stream_set_callback(pvr->video_stream.stream,
> -				 (pvr2_stream_callback) pvr2_dvb_notify, adap);
> +	pvr2_stream_set_callback(pvr->video_stream.stream, pvr2_dvb_notify,
> +				 adap);
>  
>  	ret = pvr2_stream_set_buffer_count(stream, PVR2_DVB_BUFFER_COUNT);
>  	if (ret < 0) return ret;
> diff --git a/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c b/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
> index c04ab7258d64..590f80949bbf 100644
> --- a/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
> +++ b/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
> @@ -1032,9 +1032,10 @@ static int pvr2_v4l2_open(struct file *file)
>  	return 0;
>  }
>  
> -
> -static void pvr2_v4l2_notify(struct pvr2_v4l2_fh *fhp)
> +static void pvr2_v4l2_notify(void *data)
>  {
> +	struct pvr2_v4l2_fh *fhp = data;
> +
>  	wake_up(&fhp->wait_data);
>  }
>  
> @@ -1067,7 +1068,7 @@ static int pvr2_v4l2_iosetup(struct pvr2_v4l2_fh *fh)
>  
>  	hdw = fh->channel.mc_head->hdw;
>  	sp = fh->pdi->stream->stream;
> -	pvr2_stream_set_callback(sp,(pvr2_stream_callback)pvr2_v4l2_notify,fh);
> +	pvr2_stream_set_callback(sp, pvr2_v4l2_notify, fh);
>  	pvr2_hdw_set_stream_type(hdw,fh->pdi->config);
>  	if ((ret = pvr2_hdw_set_streaming(hdw,!0)) < 0) return ret;
>  	return pvr2_ioread_set_enabled(fh->rhp,!0);
> 
> -- 
> 2.43.0.429.g432eaa2c6b-goog
>