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amiga kernel: restore INTENA's master bit when leaving a Paula interrupt #158

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amiga kernel: restore INTENA's master bit when leaving a Paula interrupt #158

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8 changes: 8 additions & 0 deletions arch/m68k-amiga/kernel/amiga_irq.c
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Original file line number Diff line number Diff line change
Expand Up @@ -142,6 +142,14 @@ static inline UWORD custom_r(ULONG reg)
#define PAULA_IRQ_EXIT() \
/* mask = custom_r(INTENAR) & custom_r(INTREQR) & (irq_mask); */ \
} while (0); \
/* The master enable was set or we would not be here. A server that \
* takes a Disable()/Enable() section finds the interrupted task's \
* IDNestCnt >= 0 when that task has an outstanding Disable() but \
* re-enabled the hardware itself (demos do: Disable(), set INTENA, \
* AddIntServer(), spin on a VBL counter), and its Enable() then leaves \
* INTEN clear for good. Interrupt handling must be transparent to the \
* interrupted code, so put the bit back */ \
custom_w(INTENA, INTF_SETCLR | INTF_INTEN); \
/* Call Exec/ExitIntr */ \
return TRUE;

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