[PATCH v2] gpio: pca953x: fix cache_only and IRQ state on restore_context() failure

[phucduc.bui@gmail.com]

From: bui duc phuc <phucduc.bui@gmail.com>

When pca953x_restore_context() fails, cache_only is left disabled and
the IRQ left enabled, even though register synchronization may not have
completed successfully. Restore cache_only and disable the IRQ again on
failure, matching the state set by pca953x_save_context().

Fixes: ec5bde62019b ("gpio: pca953x: Split pca953x_restore_context() and pca953x_save_context()")
Fixes: 3e38f946062b ("gpio: pca953x: fix IRQ storm on system wake up")
Cc: stable@vger.kernel.org
Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Changes in v2:
 - Add Fixes tag and Cc: stable (Bart).
 - Add Reviewed-by tag from Linus Walleij.
 - Update the patch subject to better reflect the patch content.

 drivers/gpio/gpio-pca953x.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index f6b870b7b352..0c94630f3160 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -1369,9 +1369,20 @@ static int pca953x_restore_context(struct pca953x_chip *chip)
 	regcache_mark_dirty(chip->regmap);
 	ret = pca953x_regcache_sync(chip);
 	if (ret)
-		return ret;
+		goto err;
+
+	ret = regcache_sync(chip->regmap);
+	if (ret)
+		goto err;
+
+	return 0;
 
-	return regcache_sync(chip->regmap);
+err:
+	if (chip->client->irq > 0)
+		disable_irq(chip->client->irq);
+	regcache_cache_only(chip->regmap, true);
+
+	return ret;
 }
 
 static void pca953x_save_context(struct pca953x_chip *chip)
-- 
2.43.0