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authorThomas Gleixner <tglx@linutronix.de>2009-03-23 13:28:15 -0400
committerThomas Gleixner <tglx@linutronix.de>2009-03-24 07:15:23 -0400
commit3aa551c9b4c40018f0e261a178e3d25478dc04a9 (patch)
tree2a696109273fcc421d774cc8fefa4180331a85ad /kernel/exit.c
parent80c5520811d3805adcb15c570ea5e2d489fa5d0b (diff)
genirq: add threaded interrupt handler support
Add support for threaded interrupt handlers: A device driver can request that its main interrupt handler runs in a thread. To achive this the device driver requests the interrupt with request_threaded_irq() and provides additionally to the handler a thread function. The handler function is called in hard interrupt context and needs to check whether the interrupt originated from the device. If the interrupt originated from the device then the handler can either return IRQ_HANDLED or IRQ_WAKE_THREAD. IRQ_HANDLED is returned when no further action is required. IRQ_WAKE_THREAD causes the genirq code to invoke the threaded (main) handler. When IRQ_WAKE_THREAD is returned handler must have disabled the interrupt on the device level. This is mandatory for shared interrupt handlers, but we need to do it as well for obscure x86 hardware where disabling an interrupt on the IO_APIC level redirects the interrupt to the legacy PIC interrupt lines. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 167e1e3ad7c6..ca0b3488c4a9 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1037,6 +1037,8 @@ NORET_TYPE void do_exit(long code)
1037 schedule(); 1037 schedule();
1038 } 1038 }
1039 1039
1040 exit_irq_thread();
1041
1040 exit_signals(tsk); /* sets PF_EXITING */ 1042 exit_signals(tsk); /* sets PF_EXITING */
1041 /* 1043 /*
1042 * tsk->flags are checked in the futex code to protect against 1044 * tsk->flags are checked in the futex code to protect against