disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/media/dvb-core/dvb_ca_en50221.c
..
..
@@ -151,13 +151,19 @@
151
151
 
152
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 	/* mutex serializing ioctls */
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 	struct mutex ioctl_mutex;
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+
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+	/* A mutex used when a device is disconnected */
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+	struct mutex remove_mutex;
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+
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+	/* Whether the device is disconnected */
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+	int exit;
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160
 };
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161
 
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 static void dvb_ca_private_free(struct dvb_ca_private *ca)
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163
 {
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164
 	unsigned int i;
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165
 
160
-	dvb_free_device(ca->dvbdev);
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+	dvb_device_put(ca->dvbdev);
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167
 	for (i = 0; i < ca->slot_count; i++)
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168
 		vfree(ca->slot_info[i].rx_buffer.data);
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169
 
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@@ -187,7 +193,7 @@
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193
 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
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194
 				    u8 *ebuf, int ecount);
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195
 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
190
-				     u8 *ebuf, int ecount);
196
+				     u8 *ebuf, int ecount, int size_write_flag);
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197
 
192
198
 /**
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199
  * Safely find needle in haystack.
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@@ -370,7 +376,7 @@
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 	ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10);
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377
 	if (ret)
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378
 		return ret;
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-	ret = dvb_ca_en50221_write_data(ca, slot, buf, 2);
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+	ret = dvb_ca_en50221_write_data(ca, slot, buf, 2, CMDREG_SW);
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380
 	if (ret != 2)
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381
 		return -EIO;
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382
 	ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
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@@ -778,11 +784,13 @@
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784
  * @buf: The data in this buffer is treated as a complete link-level packet to
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785
  *	 be written.
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786
  * @bytes_write: Size of ebuf.
787
+ * @size_write_flag: A flag on Command Register which says whether the link size
788
+ * information will be writen or not.
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789
  *
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790
  * return: Number of bytes written, or < 0 on error.
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791
  */
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 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
785
-				     u8 *buf, int bytes_write)
793
+				     u8 *buf, int bytes_write, int size_write_flag)
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794
 {
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795
 	struct dvb_ca_slot *sl = &ca->slot_info[slot];
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796
 	int status;
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@@ -817,7 +825,7 @@
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825
 
818
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 	/* OK, set HC bit */
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827
 	status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
820
-					    IRQEN | CMDREG_HC);
828
+					    IRQEN | CMDREG_HC | size_write_flag);
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829
 	if (status)
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830
 		goto exit;
823
831
 
..
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@@ -1505,7 +1513,7 @@
1505
1513
 
1506
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 			mutex_lock(&sl->slot_lock);
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1515
 			status = dvb_ca_en50221_write_data(ca, slot, fragbuf,
1508
-							   fraglen + 2);
1516
+							   fraglen + 2, 0);
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1517
 			mutex_unlock(&sl->slot_lock);
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1518
 			if (status == (fraglen + 2)) {
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1519
 				written = 1;
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@@ -1706,12 +1714,22 @@
1706
1714
 
1707
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 	dprintk("%s\n", __func__);
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1716
 
1709
-	if (!try_module_get(ca->pub->owner))
1717
+	mutex_lock(&ca->remove_mutex);
1718
+
1719
+	if (ca->exit) {
1720
+		mutex_unlock(&ca->remove_mutex);
1721
+		return -ENODEV;
1722
+	}
1723
+
1724
+	if (!try_module_get(ca->pub->owner)) {
1725
+		mutex_unlock(&ca->remove_mutex);
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1726
 		return -EIO;
1727
+	}
1711
1728
 
1712
1729
 	err = dvb_generic_open(inode, file);
1713
1730
 	if (err < 0) {
1714
1731
 		module_put(ca->pub->owner);
1732
+		mutex_unlock(&ca->remove_mutex);
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1733
 		return err;
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1734
 	}
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1735
 
..
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@@ -1736,6 +1754,7 @@
1736
1754
 
1737
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 	dvb_ca_private_get(ca);
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1756
 
1757
+	mutex_unlock(&ca->remove_mutex);
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1758
 	return 0;
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1759
 }
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1760
 
..
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@@ -1755,6 +1774,8 @@
1755
1774
 
1756
1775
 	dprintk("%s\n", __func__);
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1776
 
1777
+	mutex_lock(&ca->remove_mutex);
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+
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1779
 	/* mark the CA device as closed */
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1780
 	ca->open = 0;
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1781
 	dvb_ca_en50221_thread_update_delay(ca);
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@@ -1764,6 +1785,13 @@
1764
1785
 	module_put(ca->pub->owner);
1765
1786
 
1766
1787
 	dvb_ca_private_put(ca);
1788
+
1789
+	if (dvbdev->users == 1 && ca->exit == 1) {
1790
+		mutex_unlock(&ca->remove_mutex);
1791
+		wake_up(&dvbdev->wait_queue);
1792
+	} else {
1793
+		mutex_unlock(&ca->remove_mutex);
1794
+	}
1767
1795
 
1768
1796
 	return err;
1769
1797
 }
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..
@@ -1888,6 +1916,7 @@
1888
1916
 	}
1889
1917
 
1890
1918
 	mutex_init(&ca->ioctl_mutex);
1919
+	mutex_init(&ca->remove_mutex);
1891
1920
 
1892
1921
 	if (signal_pending(current)) {
1893
1922
 		ret = -EINTR;
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@@ -1930,6 +1959,14 @@
1930
1959
 
1931
1960
 	dprintk("%s\n", __func__);
1932
1961
 
1962
+	mutex_lock(&ca->remove_mutex);
1963
+	ca->exit = 1;
1964
+	mutex_unlock(&ca->remove_mutex);
1965
+
1966
+	if (ca->dvbdev->users < 1)
1967
+		wait_event(ca->dvbdev->wait_queue,
1968
+				ca->dvbdev->users == 1);
1969
+
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1970
 	/* shutdown the thread if there was one */
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1971
 	kthread_stop(ca->thread);
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1972