From d380b57d2849d0df66c14995130dcbbfadbc9d1f Mon Sep 17 00:00:00 2001
From: Klaus Schmidinger <vdr@tvdr.de>
Date: Sun, 6 May 2018 09:41:03 +0200
Subject: [PATCH] Fixed locking the Channels list in cDisplayChannel, where the
 lock was still held when Flush() was called

---
 CONTRIBUTORS |  2 ++
 HISTORY      |  4 ++-
 menu.c       | 71 ++++++++++++++++++++++++++++------------------------
 3 files changed, 43 insertions(+), 34 deletions(-)

diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 1875defc..73162045 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -3316,6 +3316,8 @@ Matthias Senzel <matthias.senzel@t-online.de>
  after starting the editing process
  for reporting a problem with setting the initial offset of the cursor in a list menu
  for reporting a high CPU load during replay with active progress display
+ for reporting that the lock on the Channels list in cDisplayChannel was still held
+ when Flush() was called
 
 Marek Nazarko <mnazarko@gmail.com>
  for translating OSD texts to the Polish language
diff --git a/HISTORY b/HISTORY
index 06500b8e..23dfa28a 100644
--- a/HISTORY
+++ b/HISTORY
@@ -9348,7 +9348,7 @@ Video Disk Recorder Revision History
   Senzel).
 - Official release.
 
-2018-04-28: Version 2.4.1
+2018-05-06: Version 2.4.1
 
 - Fixed handling the tfRecording flag in the SVDRP commands MODT and UPDT (reported
   by Johann Friedrichs).
@@ -9359,3 +9359,5 @@ Video Disk Recorder Revision History
   been changed to Skins.QueueMessage(), and cSkins::ProcessQueuedMessages() is now called
   unconditionally in the main loop, and checks whether the current cSkinDisplay object
   (if any) implements SetMessage().
+- Fixed locking the Channels list in cDisplayChannel, where the lock was still held
+  when Flush() was called (reported by Matthias Senzel).
diff --git a/menu.c b/menu.c
index 686806a0..a9ea49d2 100644
--- a/menu.c
+++ b/menu.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: menu.c 4.75 2018/04/28 12:09:45 kls Exp $
+ * $Id: menu.c 4.76 2018/05/06 09:30:11 kls Exp $
  */
 
 #include "menu.h"
@@ -4626,14 +4626,17 @@ cDisplayChannel::cDisplayChannel(int Number, bool Switched)
   cOsdProvider::OsdSizeChanged(osdState); // just to get the current state
   positioner = NULL;
   channel = NULL;
-  LOCK_CHANNELS_READ;
-  channel = Channels->GetByNumber(Number);
-  lastPresent = lastFollowing = NULL;
-  if (channel) {
-     DisplayChannel();
-     DisplayInfo();
+  {
+    LOCK_CHANNELS_READ;
+    channel = Channels->GetByNumber(Number);
+    lastPresent = lastFollowing = NULL;
+    if (channel) {
+       DisplayChannel();
+       DisplayInfo();
+       }
+  }
+  if (channel)
      displayChannel->Flush();
-     }
   lastTime.Set();
 }
 
@@ -4868,31 +4871,33 @@ eOSState cDisplayChannel::ProcessKey(eKeys Key)
             }
     };
   if (positioner || !timeout || lastTime.Elapsed() < (uint64_t)(Setup.ChannelInfoTime * 1000)) {
-     LOCK_CHANNELS_READ;
-     if (Key == kNone && !number && group < 0 && !NewChannel && channel && channel->Number() != cDevice::CurrentChannel()) {
-        // makes sure a channel switch through the SVDRP CHAN command is displayed
-        channel = Channels->GetByNumber(cDevice::CurrentChannel());
-        Refresh();
-        lastTime.Set();
-        }
-     DisplayInfo();
-     if (NewChannel) {
-        SetTrackDescriptions(NewChannel->Number()); // to make them immediately visible in the channel display
-        Channels->SwitchTo(NewChannel->Number());
-        SetTrackDescriptions(NewChannel->Number()); // switching the channel has cleared them
-        channel = NewChannel;
-        }
-     const cPositioner *Positioner = cDevice::ActualDevice()->Positioner();
-     bool PositionerMoving = Positioner && Positioner->IsMoving();
-     SetNeedsFastResponse(PositionerMoving);
-     if (!PositionerMoving) {
-        if (positioner)
-           lastTime.Set(); // to keep the channel display up a few seconds after the target position has been reached
-        Positioner = NULL;
-        }
-     if (Positioner || positioner) // making sure we call SetPositioner(NULL) if there is a switch from "with" to "without" positioner
-        displayChannel->SetPositioner(Positioner);
-     positioner = Positioner;
+     {
+       LOCK_CHANNELS_READ;
+       if (Key == kNone && !number && group < 0 && !NewChannel && channel && channel->Number() != cDevice::CurrentChannel()) {
+          // makes sure a channel switch through the SVDRP CHAN command is displayed
+          channel = Channels->GetByNumber(cDevice::CurrentChannel());
+          Refresh();
+          lastTime.Set();
+          }
+       DisplayInfo();
+       if (NewChannel) {
+          SetTrackDescriptions(NewChannel->Number()); // to make them immediately visible in the channel display
+          Channels->SwitchTo(NewChannel->Number());
+          SetTrackDescriptions(NewChannel->Number()); // switching the channel has cleared them
+          channel = NewChannel;
+          }
+       const cPositioner *Positioner = cDevice::ActualDevice()->Positioner();
+       bool PositionerMoving = Positioner && Positioner->IsMoving();
+       SetNeedsFastResponse(PositionerMoving);
+       if (!PositionerMoving) {
+          if (positioner)
+             lastTime.Set(); // to keep the channel display up a few seconds after the target position has been reached
+          Positioner = NULL;
+          }
+       if (Positioner || positioner) // making sure we call SetPositioner(NULL) if there is a switch from "with" to "without" positioner
+          displayChannel->SetPositioner(Positioner);
+       positioner = Positioner;
+     }
      displayChannel->Flush();
      return osContinue;
      }