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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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10
arch/mips/kernel/irq-msc01.c
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@ -52,11 +52,8 @@ static void level_mask_and_ack_msc_irq(unsigned int irq)
mask_msc_irq(irq);
if (!cpu_has_veic)
MSCIC_WRITE(MSC01_IC_EOI, 0);
#ifdef CONFIG_MIPS_MT_SMTC
/* This actually needs to be a call into platform code */
if (irq_hwmask[irq] & ST0_IM)
set_c0_status(irq_hwmask[irq] & ST0_IM);
#endif /* CONFIG_MIPS_MT_SMTC */
smtc_im_ack_irq(irq);
}
/*
@ -73,10 +70,7 @@ static void edge_mask_and_ack_msc_irq(unsigned int irq)
MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
}
#ifdef CONFIG_MIPS_MT_SMTC
if (irq_hwmask[irq] & ST0_IM)
set_c0_status(irq_hwmask[irq] & ST0_IM);
#endif /* CONFIG_MIPS_MT_SMTC */
smtc_im_ack_irq(irq);
}
/*