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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /kernel/irq/chip.c
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'kernel/irq/chip.c')
-rw-r--r--kernel/irq/chip.c28
1 files changed, 27 insertions, 1 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index e28169dd1..15206453b 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -21,6 +21,20 @@
#include "internals.h"
+static irqreturn_t bad_chained_irq(int irq, void *dev_id)
+{
+ WARN_ONCE(1, "Chained irq %d should not call an action\n", irq);
+ return IRQ_NONE;
+}
+
+/*
+ * Chained handlers should never call action on their IRQ. This default
+ * action will emit warning if such thing happens.
+ */
+struct irqaction chained_action = {
+ .handler = bad_chained_irq,
+};
+
/**
* irq_set_chip - set the irq chip for an irq
* @irq: irq number
@@ -227,6 +241,13 @@ void irq_enable(struct irq_desc *desc)
* disabled. If an interrupt happens, then the interrupt flow
* handler masks the line at the hardware level and marks it
* pending.
+ *
+ * If the interrupt chip does not implement the irq_disable callback,
+ * a driver can disable the lazy approach for a particular irq line by
+ * calling 'irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY)'. This can
+ * be used for devices which cannot disable the interrupt at the
+ * device level under certain circumstances and have to use
+ * disable_irq[_nosync] instead.
*/
void irq_disable(struct irq_desc *desc)
{
@@ -234,6 +255,8 @@ void irq_disable(struct irq_desc *desc)
if (desc->irq_data.chip->irq_disable) {
desc->irq_data.chip->irq_disable(&desc->irq_data);
irq_state_set_masked(desc);
+ } else if (irq_settings_disable_unlazy(desc)) {
+ mask_irq(desc);
}
}
@@ -669,7 +692,7 @@ void handle_percpu_irq(struct irq_desc *desc)
if (chip->irq_ack)
chip->irq_ack(&desc->irq_data);
- handle_irq_event_percpu(desc, desc->action);
+ handle_irq_event_percpu(desc);
if (chip->irq_eoi)
chip->irq_eoi(&desc->irq_data);
@@ -746,6 +769,8 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
if (desc->irq_data.chip != &no_irq_chip)
mask_ack_irq(desc);
irq_state_set_disabled(desc);
+ if (is_chained)
+ desc->action = NULL;
desc->depth = 1;
}
desc->handle_irq = handle;
@@ -755,6 +780,7 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
irq_settings_set_noprobe(desc);
irq_settings_set_norequest(desc);
irq_settings_set_nothread(desc);
+ desc->action = &chained_action;
irq_startup(desc, true);
}
}