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xtensa: clean up do_interrupt/do_IRQ

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- set up irq registers and call irq_enter/irq_exit once for each kernel
  entry due to interrupt;
- don't attempt to clear current IRQ in the do_interrupt, IRQ handler
  will take care of it;
- find pending interrupt with highest priority before every ISR
  invocation.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Max Filippov 2013-10-17 02:42:23 +04:00 committed by Chris Zankel
parent cbd1de2e8e
commit 996232393b
2 changed files with 8 additions and 19 deletions
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6
arch/xtensa/kernel/irq.c
View File

@ -30,7 +30,6 @@ atomic_t irq_err_count;
asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
int irq = irq_find_mapping(NULL, hwirq);
if (hwirq >= NR_IRQS) {
@ -38,8 +37,6 @@ asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs)
__func__, hwirq);
}
irq_enter();
#ifdef CONFIG_DEBUG_STACKOVERFLOW
/* Debugging check for stack overflow: is there less than 1KB free? */
{
@ -54,9 +51,6 @@ asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs)
}
#endif
generic_handle_irq(irq);
irq_exit();
set_irq_regs(old_regs);
}
int arch_show_interrupts(struct seq_file *p, int prec)

21
arch/xtensa/kernel/traps.c
View File

@ -212,6 +212,9 @@ void do_interrupt(struct pt_regs *regs)
XCHAL_INTLEVEL6_MASK,
XCHAL_INTLEVEL7_MASK,
};
struct pt_regs *old_regs = set_irq_regs(regs);
irq_enter();
for (;;) {
unsigned intread = get_sr(interrupt);
@ -227,21 +230,13 @@ void do_interrupt(struct pt_regs *regs)
}
if (level == 0)
return;
break;
/*
* Clear the interrupt before processing, in case it's
* edge-triggered or software-generated
*/
while (int_at_level) {
unsigned i = __ffs(int_at_level);
unsigned mask = 1 << i;
int_at_level ^= mask;
set_sr(mask, intclear);
do_IRQ(i, regs);
}
do_IRQ(__ffs(int_at_level), regs);
}
irq_exit();
set_irq_regs(old_regs);
}
/*