Patch "media: pvrusb2: fix pvr2_stream_callback casts" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    media: pvrusb2: fix pvr2_stream_callback casts

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-pvrusb2-fix-pvr2_stream_callback-casts.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 4d0f11b9dbbbff68717e326fd4d3709258f879cf
Author: Arnd Bergmann <arnd@xxxxxxxx>
Date:   Tue Feb 13 11:04:27 2024 +0100

    media: pvrusb2: fix pvr2_stream_callback casts
    
    [ Upstream commit 30baa4a96b23add91a87305baaeba82c4e109e1f ]
    
    clang-16 complains about a control flow integrity (KCFI) issue in pvrusb2,
    which casts three different prototypes into pvr2_stream_callback:
    
    drivers/media/usb/pvrusb2/pvrusb2-v4l2.c:1070:30: error: cast from 'void (*)(struct pvr2_v4l2_fh *)' to 'pvr2_stream_callback' (aka 'void (*)(void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
     1070 |         pvr2_stream_set_callback(sp,(pvr2_stream_callback)pvr2_v4l2_notify,fh);
          |                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    drivers/media/usb/pvrusb2/pvrusb2-context.c:110:6: error: cast from 'void (*)(struct pvr2_context *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
      110 |                                         (void (*)(void *))pvr2_context_notify,
          |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    drivers/media/usb/pvrusb2/pvrusb2-dvb.c:152:6: error: cast from 'void (*)(struct pvr2_dvb_adapter *)' to 'pvr2_stream_callback' (aka 'void (*)(void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
      152 |                                  (pvr2_stream_callback) pvr2_dvb_notify, adap);
          |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
    Change the functions to actually take a void* argument so the cast is no longer
    needed.
    
    Fixes: bb8ce9d9143c ("V4L/DVB (7682): pvrusb2-dvb: finish up stream & buffer handling")
    Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-context.c b/drivers/media/usb/pvrusb2/pvrusb2-context.c
index 1764674de98bc..58f2f3ff10ee2 100644
--- a/drivers/media/usb/pvrusb2/pvrusb2-context.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-context.c
@@ -90,8 +90,10 @@ static void pvr2_context_destroy(struct pvr2_context *mp)
 }
 
 
-static void pvr2_context_notify(struct pvr2_context *mp)
+static void pvr2_context_notify(void *ptr)
 {
+	struct pvr2_context *mp = ptr;
+
 	pvr2_context_set_notify(mp,!0);
 }
 
@@ -106,9 +108,7 @@ static void pvr2_context_check(struct pvr2_context *mp)
 		pvr2_trace(PVR2_TRACE_CTXT,
 			   "pvr2_context %p (initialize)", mp);
 		/* Finish hardware initialization */
-		if (pvr2_hdw_initialize(mp->hdw,
-					(void (*)(void *))pvr2_context_notify,
-					mp)) {
+		if (pvr2_hdw_initialize(mp->hdw, pvr2_context_notify, mp)) {
 			mp->video_stream.stream =
 				pvr2_hdw_get_video_stream(mp->hdw);
 			/* Trigger interface initialization.  By doing this
diff --git a/drivers/media/usb/pvrusb2/pvrusb2-dvb.c b/drivers/media/usb/pvrusb2/pvrusb2-dvb.c
index 6954584526a32..1b768e7466721 100644
--- a/drivers/media/usb/pvrusb2/pvrusb2-dvb.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-dvb.c
@@ -88,8 +88,10 @@ 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 *ptr)
 {
+	struct pvr2_dvb_adapter *adap = ptr;
+
 	wake_up(&adap->buffer_wait_data);
 }
 
@@ -149,7 +151,7 @@ static int pvr2_dvb_stream_do_start(struct pvr2_dvb_adapter *adap)
 	}
 
 	pvr2_stream_set_callback(pvr->video_stream.stream,
-				 (pvr2_stream_callback) pvr2_dvb_notify, adap);
+				 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 c872868becbdc..29f2e767f236f 100644
--- a/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
@@ -1037,8 +1037,10 @@ static int pvr2_v4l2_open(struct file *file)
 }
 
 
-static void pvr2_v4l2_notify(struct pvr2_v4l2_fh *fhp)
+static void pvr2_v4l2_notify(void *ptr)
 {
+	struct pvr2_v4l2_fh *fhp = ptr;
+
 	wake_up(&fhp->wait_data);
 }
 
@@ -1071,7 +1073,7 @@ 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);




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