4.4-stable review patch. If anyone has any objections, please let me know.
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From: Yifeng Li tomli@tomli.me
commit 5f5f67da9781770df0403269bc57d7aae608fecd upstream.
Timekeeping IRQs from CS5536 MFGPT are routed to i8259, which then triggers the "cascade" IRQ on MIPS CPU. Without IRQF_NO_SUSPEND in cascade_irqaction, MFGPT interrupts will be masked in suspend mode, and the machine would be unable to resume once suspended.
Previously, MIPS IRQs were not disabled properly, so the original code appeared to work. Commit a3e6c1eff5 ("MIPS: IRQ: Fix disable_irq on CPU IRQs") uncovers the bug. To fix it, add IRQF_NO_SUSPEND to cascade_irqaction.
This commit is functionally identical to 0add9c2f1cff ("MIPS: Loongson-3: Add IRQF_NO_SUSPEND to Cascade irqaction"), but it forgot to apply the same fix to Loongson2.
Signed-off-by: Yifeng Li tomli@tomli.me Signed-off-by: Paul Burton paul.burton@mips.com Cc: linux-mips@vger.kernel.org Cc: Jiaxun Yang jiaxun.yang@flygoat.com Cc: Huacai Chen chenhc@lemote.com Cc: Ralf Baechle ralf@linux-mips.org Cc: James Hogan jhogan@kernel.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org # v3.19+ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/mips/loongson64/lemote-2f/irq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/mips/loongson64/lemote-2f/irq.c +++ b/arch/mips/loongson64/lemote-2f/irq.c @@ -102,7 +102,7 @@ static struct irqaction ip6_irqaction = static struct irqaction cascade_irqaction = { .handler = no_action, .name = "cascade", - .flags = IRQF_NO_THREAD, + .flags = IRQF_NO_THREAD | IRQF_NO_SUSPEND, };
void __init mach_init_irq(void)