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[ACPI] acpi_register_gsi() can return error
Current acpi_register_gsi() function has no way to indicate errors to its callers even though acpi_register_gsi() can fail to register gsi because of some reasons (out of memory, lack of interrupt vectors, incorrect BIOS, and so on). As a result, caller of acpi_register_gsi() cannot handle the case that acpi_register_gsi() fails. I think failure of acpi_register_gsi() should be handled properly. This series of patches changes acpi_register_gsi() to return negative value on error, and also changes callers of acpi_register_gsi() to handle failure of acpi_register_gsi(). This patch changes the type of return value of acpi_register_gsi() from "unsigned int" to "int" to indicate an error. If acpi_register_gsi() fails to register gsi, it returns negative value. Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -457,7 +457,11 @@ int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
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return 0;
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}
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unsigned int acpi_register_gsi(u32 gsi, int edge_level, int active_high_low)
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/*
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* success: return IRQ number (>=0)
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* failure: return < 0
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*/
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int acpi_register_gsi(u32 gsi, int edge_level, int active_high_low)
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{
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unsigned int irq;
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unsigned int plat_gsi = gsi;
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@ -565,7 +565,11 @@ acpi_numa_arch_fixup (void)
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}
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#endif /* CONFIG_ACPI_NUMA */
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unsigned int
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/*
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* success: return IRQ number (>=0)
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* failure: return < 0
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*/
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int
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acpi_register_gsi (u32 gsi, int edge_level, int active_high_low)
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{
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if (has_8259 && gsi < 16)
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@ -432,7 +432,7 @@ static inline int acpi_boot_table_init(void)
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#endif /*!CONFIG_ACPI_BOOT*/
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unsigned int acpi_register_gsi (u32 gsi, int edge_level, int active_high_low);
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int acpi_register_gsi (u32 gsi, int edge_level, int active_high_low);
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int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
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/*
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