linux-kernel - [PATCH 4.19 43/47] regmap-irq: do not write mask register if mask

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Date:   Thu, 18 Jul 2019 12:01:57 +0900
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Laxman Dewangan <ldewangan@...dia.com>,
        Jinyoung Park <jinyoungp@...dia.com>,
        Venkat Reddy Talla <vreddytalla@...dia.com>,
        Mark Zhang <markz@...dia.com>, Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.19 43/47] regmap-irq: do not write mask register if mask_base is zero

From: Mark Zhang <markz@...dia.com>

commit 7151449fe7fa5962c6153355f9779d6be99e8e97 upstream.

If client have not provided the mask base register then do not
write into the mask register.

Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
Signed-off-by: Jinyoung Park <jinyoungp@...dia.com>
Signed-off-by: Venkat Reddy Talla <vreddytalla@...dia.com>
Signed-off-by: Mark Zhang <markz@...dia.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/base/regmap/regmap-irq.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -91,6 +91,9 @@ static void regmap_irq_sync_unlock(struc
 	 * suppress pointless writes.
 	 */
 	for (i = 0; i < d->chip->num_regs; i++) {
+		if (!d->chip->mask_base)
+			continue;
+
 		reg = d->chip->mask_base +
 			(i * map->reg_stride * d->irq_reg_stride);
 		if (d->chip->mask_invert) {
@@ -526,6 +529,9 @@ int regmap_add_irq_chip(struct regmap *m
 	/* Mask all the interrupts by default */
 	for (i = 0; i < chip->num_regs; i++) {
 		d->mask_buf[i] = d->mask_buf_def[i];
+		if (!chip->mask_base)
+			continue;
+
 		reg = chip->mask_base +
 			(i * map->reg_stride * d->irq_reg_stride);
 		if (chip->mask_invert)