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Commit 99623239 authored by Max Filippov's avatar Max Filippov Committed by Chris Zankel
Browse files

xtensa: clean up do_interrupt/do_IRQ 



- 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: default avatarMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: default avatarChris Zankel <chris@zankel.net>
parent cbd1de2e

arch/xtensa/kernel/irq.c

+0 −6
Original line number Diff line number Diff line
@@ -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)

arch/xtensa/kernel/traps.c

+9 −14
Original line number Diff line number Diff line
@@ -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;



		/*

		 * 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;

			break;



			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);

}



/*