Commit 3eece72d authored by Bibo Mao's avatar Bibo Mao Committed by Thomas Gleixner
Browse files

irqchip/loongson-eiointc: Skip handling if there is no pending interrupt 



eiointc_irq_dispatch() iterates over the pending bit registers of the
interrupt controller and evaluates the result even if there is no interrupt
pending in a particular 64bit chunk.

Skip handling and especially the pointless write back for clearing the
non-pending bits if a chunk is empty.

[ tglx: Massaged changelog ]

Signed-off-by: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
Link: https://lore.kernel.org/r/20240130082722.2912576-3-maobibo@loongson.cn
parent aafd7535

drivers/irqchip/irq-loongson-eiointc.c

+6 −0
Original line number Diff line number Diff line
@@ -198,6 +198,12 @@ static void eiointc_irq_dispatch(struct irq_desc *desc) 


	for (i = 0; i < eiointc_priv[0]->vec_count / VEC_COUNT_PER_REG; i++) {

		pending = iocsr_read64(EIOINTC_REG_ISR + (i << 3));



		/* Skip handling if pending bitmap is zero */

		if (!pending)

			continue;



		/* Clear the IRQs */

		iocsr_write64(pending, EIOINTC_REG_ISR + (i << 3));

		while (pending) {

			int bit = __ffs(pending);