irqchip/loongson-htvec: Fix initial interrupt clearing

In htvec_reset() only the first group of initial interrupts is cleared.
This sometimes causes spurious interrupts, so let's clear all groups.

While at it, fix the nearby comment that to match the reality of what
the driver does.

Fixes: 818e915fbac518e8c78e1877 ("irqchip: Add Loongson HyperTransport Vector support")
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/1599819978-13999-2-git-send-email-chenhc@lemote.com

diff --git a/drivers/irqchip/irq-loongson-htvec.c b/drivers/irqchip/irq-loongson-htvec.c
index 13e6016..6392aaf 100644 (file)
--- a/drivers/irqchip/irq-loongson-htvec.c
+++ b/drivers/irqchip/irq-loongson-htvec.c
@@ -151,7 +151,7 @@ static void htvec_reset(struct htvec *priv)
        /* Clear IRQ cause registers, mask all interrupts */
        for (idx = 0; idx < priv->num_parents; idx++) {
                writel_relaxed(0x0, priv->base + HTVEC_EN_OFF + 4 * idx);
-               writel_relaxed(0xFFFFFFFF, priv->base);
+               writel_relaxed(0xFFFFFFFF, priv->base + 4 * idx);
        }
 }
 
@@ -172,7 +172,7 @@ static int htvec_of_init(struct device_node *node,
                goto free_priv;
        }
 
-       /* Interrupt may come from any of the 4 interrupt line */
+       /* Interrupt may come from any of the 8 interrupt lines */
        for (i = 0; i < HTVEC_MAX_PARENT_IRQ; i++) {
                parent_irq[i] = irq_of_parse_and_map(node, i);
                if (parent_irq[i] <= 0)