V4L/DVB (4337): Refine dead code elimination in pvrusb2

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/pvrusb2/pvrusb2-hdw.c

@@ -852,7 +852,6 @@ unsigned long pvr2_hdw_get_sn(struct pvr2_hdw *hdw)
 	return hdw->serial_number;
 }
 
-
 int pvr2_hdw_get_unit_number(struct pvr2_hdw *hdw)
 {
 	return hdw->unit_number;
@@ -2318,7 +2317,6 @@ void pvr2_hdw_poll_trigger_unlocked(struct pvr2_hdw *hdw)
 	}
 }
 
-
 /* Return name for this driver instance */
 const char *pvr2_hdw_get_driver_name(struct pvr2_hdw *hdw)
 {
@@ -2542,6 +2540,10 @@ static void pvr2_ctl_timeout(unsigned long data)
 }
 
 
+/* Issue a command and get a response from the device.  This extended
+   version includes a probe flag (which if set means that device errors
+   should not be logged or treated as fatal) and a timeout in jiffies.
+   This can be used to non-lethally probe the health of endpoint 1. */
 static int pvr2_send_request_ex(struct pvr2_hdw *hdw,
 				unsigned int timeout,int probe_fl,
 				void *write_data,unsigned int write_len,
@@ -2970,6 +2972,7 @@ int pvr2_hdw_cmd_decoder_reset(struct pvr2_hdw *hdw)
 }
 
 
+/* Stop / start video stream transport */
 static int pvr2_hdw_cmd_usbstream(struct pvr2_hdw *hdw,int runFl)
 {
 	int status;
@@ -3068,6 +3071,7 @@ int pvr2_hdw_gpio_chg_out(struct pvr2_hdw *hdw,u32 msk,u32 val)
 }
 
 
+/* Find I2C address of eeprom */
 static int pvr2_hdw_get_eeprom_addr(struct pvr2_hdw *hdw)
 {
 	int result;

drivers/media/video/pvrusb2/pvrusb2-io.c

@@ -26,6 +26,8 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 
+static const char *pvr2_buffer_state_decode(enum pvr2_buffer_state);
+
 #define BUFFER_SIG 0x47653271
 
 // #define SANITY_CHECK_BUFFERS
@@ -515,6 +517,10 @@ void pvr2_stream_set_callback(struct pvr2_stream *sp,
 }
 
 /* Query / set the nominal buffer count */
+int pvr2_stream_get_buffer_count(struct pvr2_stream *sp)
+{
+	return sp->buffer_target_count;
+}
 
 int pvr2_stream_set_buffer_count(struct pvr2_stream *sp,unsigned int cnt)
 {
@@ -553,7 +559,6 @@ int pvr2_stream_get_ready_count(struct pvr2_stream *sp)
 	return sp->r_count;
 }
 
-
 void pvr2_stream_kill(struct pvr2_stream *sp)
 {
 	struct pvr2_buffer *bp;
@@ -607,7 +612,6 @@ int pvr2_buffer_queue(struct pvr2_buffer *bp)
 	return ret;
 }
 
-
 int pvr2_buffer_set_buffer(struct pvr2_buffer *bp,void *ptr,unsigned int cnt)
 {
 	int ret = 0;
@@ -646,7 +650,6 @@ int pvr2_buffer_get_status(struct pvr2_buffer *bp)
 	return bp->status;
 }
 
-
 int pvr2_buffer_get_id(struct pvr2_buffer *bp)
 {
 	return bp->id;

drivers/media/video/pvrusb2/pvrusb2-io.h

@@ -47,6 +47,7 @@ void pvr2_stream_set_callback(struct pvr2_stream *,
 			      void *data);
 
 /* Query / set the nominal buffer count */
+int pvr2_stream_get_buffer_count(struct pvr2_stream *);
 int pvr2_stream_set_buffer_count(struct pvr2_stream *,unsigned int);
 
 /* Get a pointer to a buffer that is either idle, ready, or is specified
@@ -58,6 +59,7 @@ struct pvr2_buffer *pvr2_stream_get_buffer(struct pvr2_stream *sp,int id);
 /* Find out how many buffers are idle or ready */
 int pvr2_stream_get_ready_count(struct pvr2_stream *);
 
+
 /* Kill all pending buffers and throw away any ready buffers as well */
 void pvr2_stream_kill(struct pvr2_stream *);
 

drivers/media/video/pvrusb2/pvrusb2-ioread.c

@@ -213,7 +213,9 @@ int pvr2_ioread_setup(struct pvr2_ioread *cp,struct pvr2_stream *sp)
 				   " pvr2_ioread_setup (tear-down) id=%p",cp);
 			pvr2_ioread_stop(cp);
 			pvr2_stream_kill(cp->stream);
+			if (pvr2_stream_get_buffer_count(cp->stream)) {
 				pvr2_stream_set_buffer_count(cp->stream,0);
+			}
 			cp->stream = NULL;
 		}
 		if (sp) {
@@ -251,7 +253,6 @@ int pvr2_ioread_set_enabled(struct pvr2_ioread *cp,int fl)
 	return ret;
 }
 
-
 static int pvr2_ioread_get_buffer(struct pvr2_ioread *cp)
 {
 	int stat;