recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.9/0057-genirq-Handle-pending-irqs-in-irq_startup.patch

   1 From cde7a1b79f95c783def648bff541ee319148e611 Mon Sep 17 00:00:00 2001
   2 From: Thomas Gleixner <tglx@linutronix.de>
   3 Date: Wed, 8 Feb 2012 11:57:52 +0100
   4 Subject: [PATCH 57/72] genirq: Handle pending irqs in irq_startup()
   5
   6 commit b4bc724e82e80478cba5fe9825b62e71ddf78757 upstream.
   7
   8 An interrupt might be pending when irq_startup() is called, but the
   9 startup code does not invoke the resend logic. In some cases this
  10 prevents the device from issuing another interrupt which renders the
  11 device non functional.
  12
  13 Call the resend function in irq_startup() to keep things going.
  14
  15 Reported-and-tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
  16 Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  18 ---
  19  kernel/irq/autoprobe.c |    4 ++--
  20  kernel/irq/chip.c      |   17 ++++++++++-------
  21  kernel/irq/internals.h |    2 +-
  22  kernel/irq/manage.c    |    2 +-
  23  4 files changed, 14 insertions(+), 11 deletions(-)
  24
  25 diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
  26 index 342d8f4..0119b9d 100644
  27 --- a/kernel/irq/autoprobe.c
  28 +++ b/kernel/irq/autoprobe.c
  29 @@ -53,7 +53,7 @@ unsigned long probe_irq_on(void)
  30                         if (desc->irq_data.chip->irq_set_type)
  31                                 desc->irq_data.chip->irq_set_type(&desc->irq_data,
  32                                                          IRQ_TYPE_PROBE);
  33 -                       irq_startup(desc);
  34 +                       irq_startup(desc, false);
  35                 }
  36                 raw_spin_unlock_irq(&desc->lock);
  37         }
  38 @@ -70,7 +70,7 @@ unsigned long probe_irq_on(void)
  39                 raw_spin_lock_irq(&desc->lock);
  40                 if (!desc->action && irq_settings_can_probe(desc)) {
  41                         desc->istate |= IRQS_AUTODETECT | IRQS_WAITING;
  42 -                       if (irq_startup(desc))
  43 +                       if (irq_startup(desc, false))
  44                                 desc->istate |= IRQS_PENDING;
  45                 }
  46                 raw_spin_unlock_irq(&desc->lock);
  47 diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
  48 index b742edc..fb7db75 100644
  49 --- a/kernel/irq/chip.c
  50 +++ b/kernel/irq/chip.c
  51 @@ -157,19 +157,22 @@ static void irq_state_set_masked(struct irq_desc *desc)
  52         irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
  53  }
  54
  55 -int irq_startup(struct irq_desc *desc)
  56 +int irq_startup(struct irq_desc *desc, bool resend)
  57  {
  58 +       int ret = 0;
  59 +
  60         irq_state_clr_disabled(desc);
  61         desc->depth = 0;
  62
  63         if (desc->irq_data.chip->irq_startup) {
  64 -               int ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
  65 +               ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
  66                 irq_state_clr_masked(desc);
  67 -               return ret;
  68 +       } else {
  69 +               irq_enable(desc);
  70         }
  71 -
  72 -       irq_enable(desc);
  73 -       return 0;
  74 +       if (resend)
  75 +               check_irq_resend(desc, desc->irq_data.irq);
  76 +       return ret;
  77  }
  78
  79  void irq_shutdown(struct irq_desc *desc)
  80 @@ -646,7 +649,7 @@ __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
  81                 irq_settings_set_noprobe(desc);
  82                 irq_settings_set_norequest(desc);
  83                 irq_settings_set_nothread(desc);
  84 -               irq_startup(desc);
  85 +               irq_startup(desc, true);
  86         }
  87  out:
  88         irq_put_desc_busunlock(desc, flags);
  89 diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
  90 index a73dd6c..e1a8b64 100644
  91 --- a/kernel/irq/internals.h
  92 +++ b/kernel/irq/internals.h
  93 @@ -67,7 +67,7 @@ extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  94  extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
  95  extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
  96
  97 -extern int irq_startup(struct irq_desc *desc);
  98 +extern int irq_startup(struct irq_desc *desc, bool resend);
  99  extern void irq_shutdown(struct irq_desc *desc);
 100  extern void irq_enable(struct irq_desc *desc);
 101  extern void irq_disable(struct irq_desc *desc);
 102 diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
 103 index 1da999f..cf2d7ae 100644
 104 --- a/kernel/irq/manage.c
 105 +++ b/kernel/irq/manage.c
 106 @@ -1027,7 +1027,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
 107                         desc->istate |= IRQS_ONESHOT;
 108
 109                 if (irq_settings_can_autoenable(desc))
 110 -                       irq_startup(desc);
 111 +                       irq_startup(desc, true);
 112                 else
 113                         /* Undo nested disables: */
 114                         desc->depth = 1;
 115 --
 116 1.7.9.4
 117