Individual IRQs are not longer disabled on each interrupt. See ChangeLog for detailed explanation

ChangeLog

@@ -6432,7 +6432,7 @@
 	  Unfortunately, it does not yet work (2013-1-14).
 	* configs/px4fmu-v2_upstream:  Configuration for testing simple
 	  configurations on the the PX4FMU v2.  This version is incomplete
-	  for the PX4 appliation and is not a replacement for the version
+	  for the PX4 application and is not a replacement for the version
 	  in the PX4 GIT repository.
 	* fs/fat/fs_fat32.c: A correction to FAT cluster allocation from
 	  Tridge via Lorenz Meier (2014-1-14).
@@ -6446,4 +6446,10 @@
 	  conditionally done only for FAT 32.  Apparently this needs to
 	  done for all FAT types.  From Tridge via Lorenz Meier
 	  (2014-1-14).
-
+	* arch/arm/src/armv6-m/up_doirq.c and armv7-m/up_doirq.c and all
+	  implementations of up_mask_acq() for all Cortex-M architectures:  Do
+	  not disable and enable the IRQ on each interrupt.  Because (1)
+	  interrupts are already disabled on interrupt entry, (2) this
+	  interferes with controlling the IRQ interrrupt setting from interrupt
+	  handlers, and (3) up_disable_irq() does not work anyway so that this
+	  has never done anything (2014-1-15).

arch/arm/src/armv6-m/up_doirq.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/src/armv6-m/up_doirq.c
  *
- *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2013-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -93,9 +93,9 @@ uint32_t *up_doirq(int irq, uint32_t *regs)
   savestate    = (uint32_t*)current_regs;
   current_regs = regs;
 
-  /* Mask and acknowledge the interrupt */
+  /* Acknowledge the interrupt */
 
-  up_maskack_irq(irq);
+  up_ack_irq(irq);
 
   /* Deliver the IRQ */
 
@@ -115,10 +115,6 @@ uint32_t *up_doirq(int irq, uint32_t *regs)
    */
 
   current_regs = savestate;
-
-  /* Unmask the last interrupt (global interrupts are still disabled) */
-
-  up_enable_irq(irq);
 #endif
   up_ledoff(LED_INIRQ);
   return regs;

arch/arm/src/armv7-m/up_doirq.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/src/armv7-m/up_doirq.c
  *
- *   Copyright (C) 2009, 2011, 2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2011, 2013-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -93,9 +93,9 @@ uint32_t *up_doirq(int irq, uint32_t *regs)
   savestate    = (uint32_t*)current_regs;
   current_regs = regs;
 
-  /* Mask and acknowledge the interrupt */
+  /* Acknowledge the interrupt */
 
-  up_maskack_irq(irq);
+  up_ack_irq(irq);
 
   /* Deliver the IRQ */
 
@@ -115,10 +115,6 @@ uint32_t *up_doirq(int irq, uint32_t *regs)
    */
 
   current_regs = savestate;
-
-  /* Unmask the last interrupt (global interrupts are still disabled) */
-
-  up_enable_irq(irq);
 #endif
   up_ledoff(LED_INIRQ);
   return regs;

arch/arm/src/common/up_internal.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * common/up_internal.h
  *
- *   Copyright (C) 2007-2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -313,15 +313,15 @@ void up_systemreset(void) noreturn_function;
 /* Interrupt handling *******************************************************/
 
 void up_irqinitialize(void);
-void up_maskack_irq(int irq);
 
 /* Exception handling logic unique to the Cortex-M family */
 
 #if defined(CONFIG_ARCH_CORTEXM0) || defined(CONFIG_ARCH_CORTEXM3) || \
     defined(CONFIG_ARCH_CORTEXM4)
 
-/* Interrupt dispatch */
+/* Interrupt acknowledge and dispatch */
 
+void up_ack_irq(int irq);
 uint32_t *up_doirq(int irq, uint32_t *regs);
 
 /* Exception Handlers */
@@ -341,8 +341,9 @@ int  up_memfault(int irq, FAR void *context);
 
 #elif defined(CONFIG_ARCH_CORTEXA5) || defined(CONFIG_ARCH_CORTEXA8)
 
-/* Interrupt dispatch */
+/* Interrupt acknowledge and dispatch */
 
+void up_maskack_irq(int irq);
 uint32_t *arm_doirq(int irq, uint32_t *regs);
 
 /* Paging support */
@@ -365,8 +366,9 @@ uint32_t *arm_undefinedinsn(uint32_t *regs);
 
 #else /* ARM7 | ARM9 */
 
-/* Interrupt dispatch */
+/* Interrupt acknowledge and dispatch */
 
+void up_maskack_irq(int irq);
 void up_doirq(int irq, uint32_t *regs);
 
 /* Paging support (and exception handlers) */

arch/arm/src/kinetis/kinetis_irq.c

@@ -1,6 +1,5 @@
 /****************************************************************************
  * arch/arm/src/lpc17/kinetis_irq.c
- * arch/arm/src/chip/kinetis_irq.c
  *
  *   Copyright (C) 2011, 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -478,17 +477,15 @@ void up_enable_irq(int irq)
 }
 
 /****************************************************************************
- * Name: up_maskack_irq
+ * Name: up_ack_irq
  *
  * Description:
- *   Mask the IRQ and acknowledge it
+ *  Acknowledge the IRQ
  *
  ****************************************************************************/
 
-void up_maskack_irq(int irq)
+void up_ack_irq(int irq)
 {
-  up_disable_irq(irq);
-
 #if 0 /* Does not appear to be necessary in most cases */
   kinetis_clrpend(irq);
 #endif

arch/arm/src/kl/kl_irq.c

@@ -1,8 +1,7 @@
 /****************************************************************************
  * arch/arm/src/stm32/kl_irq.c
- * arch/arm/src/chip/kl_irq.c
  *
- *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2013-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -258,11 +257,6 @@ void up_irqinitialize(void)
 
 void up_disable_irq(int irq)
 {
-  /* This will be called on each interrupt (via up_maskack_irq()) whether
-   * the interrupt can be disabled or not.  So this assertion is necessarily
-   * lame.
-   */
-
   DEBUGASSERT((unsigned)irq < NR_IRQS);
 
   /* Check for an external interrupt */
@@ -297,7 +291,7 @@ void up_disable_irq(int irq)
 void up_enable_irq(int irq)
 {
   /* This will be called on each interrupt exit whether the interrupt can be
-   * enambled or not.  So this assertion is necessarily lame.
+   * enabled or not.  So this assertion is necessarily lame.
    */
 
   DEBUGASSERT((unsigned)irq < NR_IRQS);
@@ -324,15 +318,14 @@ void up_enable_irq(int irq)
 }
 
 /****************************************************************************
- * Name: up_maskack_irq
+ * Name: up_ack_irq
  *
  * Description:
- *   Mask the IRQ and acknowledge it
+ *   Acknowledge the IRQ
  *
  ****************************************************************************/
 
-void up_maskack_irq(int irq)
+void up_ack_irq(int irq)
 {
-  up_disable_irq(irq);
   kl_clrpend(irq);
 }

arch/arm/src/lm/lm_irq.c

@@ -2,7 +2,7 @@
  * arch/arm/src/lm/lm_irq.c
  * arch/arm/src/chip/lm_irq.c
  *
- *   Copyright (C) 2009, 2011, 2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2011, 2013-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -402,6 +402,7 @@ void up_disable_irq(int irq)
       regval &= ~bit;
       putreg32(regval, regaddr);
     }
+
   lm_dumpnvic("disable", irq);
 }
 
@@ -427,20 +428,20 @@ void up_enable_irq(int irq)
       regval |= bit;
       putreg32(regval, regaddr);
     }
+
   lm_dumpnvic("enable", irq);
 }
 
 /****************************************************************************
- * Name: up_maskack_irq
+ * Name: up_ack_irq
  *
  * Description:
- *   Mask the IRQ and acknowledge it
+ *   Acknowledge the IRQ
  *
  ****************************************************************************/
 
-void up_maskack_irq(int irq)
+void up_ack_irq(int irq)
 {
-  up_disable_irq(irq);
 }
 
 /****************************************************************************

arch/arm/src/lpc17xx/lpc17_irq.c

@@ -1,8 +1,7 @@
 /****************************************************************************
  * arch/arm/src/lpc17/lpc17_irq.c
- * arch/arm/src/chip/lpc17_irq.c
  *
- *   Copyright (C) 2010-2011, 2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2010-2011, 2013-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -404,6 +403,7 @@ void up_disable_irq(int irq)
       lpc17_gpioirqdisable(irq);
     }
 #endif
+
   lpc17_dumpnvic("disable", irq);
 }
 
@@ -437,21 +437,20 @@ void up_enable_irq(int irq)
       lpc17_gpioirqenable(irq);
     }
 #endif
+
   lpc17_dumpnvic("enable", irq);
 }
 
 /****************************************************************************
- * Name: up_maskack_irq
+ * Name: up_ack_irq
  *
  * Description:
- *   Mask the IRQ and acknowledge it
+ *   Acknowledge the IRQ
  *
  ****************************************************************************/
 
-void up_maskack_irq(int irq)
+void up_ack_irq(int irq)
 {
-  up_disable_irq(irq);
-
 #if 0 /* Does not appear to be necessary in most cases */
   lpc17_clrpend(irq);
 #endif

arch/arm/src/lpc43xx/lpc43_irq.c

@@ -1,8 +1,7 @@
 /****************************************************************************
  * arch/arm/src/lpc43/lpc43_irq.c
- * arch/arm/src/chip/lpc43_irq.c
  *
- *   Copyright (C) 2012-2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2012-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -442,6 +441,7 @@ void up_disable_irq(int irq)
       lpc43_gpioint_disable(irq);
     }
 #endif
+
   lpc43_dumpnvic("disable", irq);
 }
 
@@ -475,21 +475,20 @@ void up_enable_irq(int irq)
       lpc43_gpioint_enable(irq);
     }
 #endif
+
   lpc43_dumpnvic("enable", irq);
 }
 
 /****************************************************************************
- * Name: up_maskack_irq
+ * Name: up_ack_irq
  *
  * Description:
- *   Mask the IRQ and acknowledge it
+ *   Acknowledge the IRQ
  *
  ****************************************************************************/
 
-void up_maskack_irq(int irq)
+void up_ack_irq(int irq)
 {
-  up_disable_irq(irq);
-
 #if 0 /* Does not appear to be necessary in most cases */
   lpc43_clrpend(irq);
 #endif

arch/arm/src/nuc1xx/nuc_irq.c

@@ -1,8 +1,7 @@
 /****************************************************************************
  * arch/arm/src/stm32/nuc_irq.c
- * arch/arm/src/chip/nuc_irq.c
  *
- *   Copyright (C) 2009-2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -258,11 +257,6 @@ void up_irqinitialize(void)
 
 void up_disable_irq(int irq)
 {
-  /* This will be called on each interrupt (via up_maskack_irq()) whether
-   * the interrupt can be disabled or not.  So this assertion is necessarily
-   * lame.
-   */
-
   DEBUGASSERT((unsigned)irq < NR_IRQS);
 
   /* Check for an external interrupt */
@@ -324,16 +318,15 @@ void up_enable_irq(int irq)
 }
 
 /****************************************************************************
- * Name: up_maskack_irq
+ * Name: up_ack_irq
  *
  * Description:
- *   Mask the IRQ and acknowledge it
+ *   Acknowledge the IRQ
  *
  ****************************************************************************/
 
-void up_maskack_irq(int irq)
+void up_ack_irq(int irq)
 {
-  up_disable_irq(irq);
   nuc_clrpend(irq);
 }
 

arch/arm/src/sam34/sam_irq.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/src/sam34/sam_irq.c
  *
- *   Copyright (C) 2009, 2011, 2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2011, 2013-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -507,16 +507,15 @@ void up_enable_irq(int irq)
 }
 
 /****************************************************************************
- * Name: up_maskack_irq
+ * Name: up_ack_irq
  *
  * Description:
- *   Mask the IRQ and acknowledge it
+ *   Acknowledge the IRQ
  *
  ****************************************************************************/
 
-void up_maskack_irq(int irq)
+void up_ack_irq(int irq)
 {
-  up_disable_irq(irq);
 }
 
 /****************************************************************************

arch/arm/src/stm32/stm32_irq.c

@@ -2,7 +2,7 @@
  * arch/arm/src/stm32/stm32_irq.c
  * arch/arm/src/chip/stm32_irq.c
  *
- *   Copyright (C) 2009-2013 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -458,16 +458,15 @@ void up_enable_irq(int irq)
 }
 
 /****************************************************************************
- * Name: up_maskack_irq
+ * Name: up_ack_irq
  *
  * Description:
- *   Mask the IRQ and acknowledge it
+ *   Acknowledge the IRQ
  *
  ****************************************************************************/
 
-void up_maskack_irq(int irq)
+void up_ack_irq(int irq)
 {
-  up_disable_irq(irq);
 }
 
 /****************************************************************************