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[MIPS] SMTC: Make ack_bad_irq() safe with no IM backstop.

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Issue reported and original patch by Kevin Kissel, cleaner (imho)
implementation by me.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
2007-09-21 17:13:55 +01:00
parent 7bae705ef2
commit 1146fe3050
5 changed files with 32 additions and 30 deletions
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32
include/asm-mips/irq.h
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@@ -24,7 +24,30 @@ static inline int irq_canonicalize(int irq)
#define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */
#endif
#ifdef CONFIG_MIPS_MT_SMTC
struct irqaction;
extern unsigned long irq_hwmask[];
extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
unsigned long hwmask);
static inline void smtc_im_ack_irq(unsigned int irq)
{
if (irq_hwmask[irq] & ST0_IM)
set_c0_status(irq_hwmask[irq] & ST0_IM);
}
#else
static inline void smtc_im_ack_irq(unsigned int irq)
{
}
#endif /* CONFIG_MIPS_MT_SMTC */
#ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
/*
* Clear interrupt mask handling "backstop" if irq_hwmask
* entry so indicates. This implies that the ack() or end()
@@ -38,6 +61,7 @@ do { \
~(irq_hwmask[irq] & 0x0000ff00)); \
} while (0)
#else
#define __DO_IRQ_SMTC_HOOK(irq) do { } while (0)
#endif
@@ -60,14 +84,6 @@ do { \
extern void arch_init_irq(void);
extern void spurious_interrupt(void);
#ifdef CONFIG_MIPS_MT_SMTC
struct irqaction;
extern unsigned long irq_hwmask[];
extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
unsigned long hwmask);
#endif /* CONFIG_MIPS_MT_SMTC */
extern int allocate_irqno(void);
extern void alloc_legacy_irqno(void);
extern void free_irqno(unsigned int irq);