[PATCH 5.7 053/204] irqchip/loongson-liointc: Fix misuse of gc->mask_cache

Greg Kroah-Hartman
2020-08-20T09:37:28Z

From: Huacai Chen <chenhc@lemote.com>

commit c9c73a05413ea4a465cae1cb3593b01b190a233f upstream.

In gc->mask_cache bits, 1 means enabled and 0 means disabled, but in the
loongson-liointc driver mask_cache is misused by reverting its meaning.
This patch fix the bug and update the comments as well.

Fixes: dbb152267908c4b2c3639492a ("irqchip: Add driver for Loongson I/O Local Interrupt Controller")
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/1596099090-23516-4-git-send-email-chenhc@lemote.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/irqchip/irq-loongson-liointc.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/irqchip/irq-loongson-liointc.c
+++ b/drivers/irqchip/irq-loongson-liointc.c
@@ -60,7 +60,7 @@ static void liointc_chained_handle_irq(s
if (!pending) {
/* Always blame LPC IRQ if we have that bug */
if (handler->priv->has_lpc_irq_errata &&
- (handler->parent_int_map & ~gc->mask_cache &
+ (handler->parent_int_map & gc->mask_cache &
BIT(LIOINTC_ERRATA_IRQ)))
pending = BIT(LIOINTC_ERRATA_IRQ);
else
@@ -132,11 +132,11 @@ static void liointc_resume(struct irq_ch
irq_gc_lock_irqsave(gc, flags);
/* Disable all at first */
writel(0xffffffff, gc->reg_base + LIOINTC_REG_INTC_DISABLE);
- /* Revert map cache */
+ /* Restore map cache */
for (i = 0; i < LIOINTC_CHIP_IRQ; i++)
writeb(priv->map_cache[i], gc->reg_base + i);
- /* Revert mask cache */
- writel(~gc->mask_cache, gc->reg_base + LIOINTC_REG_INTC_ENABLE);
+ /* Restore mask cache */
+ writel(gc->mask_cache, gc->reg_base + LIOINTC_REG_INTC_ENABLE);
irq_gc_unlock_irqrestore(gc, flags);
}

@@ -244,7 +244,7 @@ int __init liointc_of_init(struct device
ct->chip.irq_mask_ack = irq_gc_mask_disable_reg;
ct->chip.irq_set_type = liointc_set_type;

- gc->mask_cache = 0xffffffff;
+ gc->mask_cache = 0;
priv->gc = gc;

for (i = 0; i < LIOINTC_NUM_PARENT; i++) {