[PATCH 1/3] gpio: brcmstb: correct hwirq to bank map

[Florian Fainelli]

From: Doug Berger <opendmb at gmail.com>

The brcmstb_gpio_hwirq_to_bank() function was designed to
accommodate the downward numbering of dynamic GPIOs by
traversing the bank list in the reverse order. However, the
dynamic numbering has changed to increment upward which can
produce an incorrect mapping.

The function is modified to no longer assume an ordering of
the list to accommodate either option.

Fixes: 7b61212f2a07 ("gpiolib: Get rid of ARCH_NR_GPIOS")
Signed-off-by: Doug Berger <opendmb at gmail.com>
Signed-off-by: Florian Fainelli <florian.fainelli at broadcom.com>
---
 drivers/gpio/gpio-brcmstb.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-brcmstb.c b/drivers/gpio/gpio-brcmstb.c
index af9287ff5dc4..2352d099709c 100644
--- a/drivers/gpio/gpio-brcmstb.c
+++ b/drivers/gpio/gpio-brcmstb.c
@@ -301,12 +301,10 @@ static struct brcmstb_gpio_bank *brcmstb_gpio_hwirq_to_bank(
 		struct brcmstb_gpio_priv *priv, irq_hw_number_t hwirq)
 {
 	struct brcmstb_gpio_bank *bank;
-	int i = 0;
 
-	/* banks are in descending order */
-	list_for_each_entry_reverse(bank, &priv->bank_list, node) {
-		i += bank->chip.gc.ngpio;
-		if (hwirq < i)
+	list_for_each_entry(bank, &priv->bank_list, node) {
+		if (hwirq >= bank->chip.gc.offset &&
+		    hwirq < (bank->chip.gc.offset + bank->chip.gc.ngpio))
 			return bank;
 	}
 	return NULL;
-- 
2.43.0