linux-kernel - [PATCH 5.10 43/43] Input: zinitix - make sure the IRQ is allocated before it gets enabled

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Message-Id: <20220110071818.798892318@linuxfoundation.org>
Date:   Mon, 10 Jan 2022 08:23:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>,
        Nikita Travkin <nikita@...n.ru>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 5.10 43/43] Input: zinitix - make sure the IRQ is allocated before it gets enabled

From: Nikita Travkin <nikita@...n.ru>

commit cf73ed894ee939d6706d65e0cd186e4a64e3af6d upstream.

Since irq request is the last thing in the driver probe, it happens
later than the input device registration. This means that there is a
small time window where if the open method is called the driver will
attempt to enable not yet available irq.

Fix that by moving the irq request before the input device registration.

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Fixes: 26822652c85e ("Input: add zinitix touchscreen driver")
Signed-off-by: Nikita Travkin <nikita@...n.ru>
Link: https://lore.kernel.org/r/20220106072840.36851-2-nikita@trvn.ru
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/input/touchscreen/zinitix.c |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

--- a/drivers/input/touchscreen/zinitix.c
+++ b/drivers/input/touchscreen/zinitix.c
@@ -488,6 +488,15 @@ static int zinitix_ts_probe(struct i2c_c
 		return error;
 	}
 
+	error = devm_request_threaded_irq(&client->dev, client->irq,
+					  NULL, zinitix_ts_irq_handler,
+					  IRQF_ONESHOT,
+					  client->name, bt541);
+	if (error) {
+		dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
+		return error;
+	}
+
 	error = zinitix_init_input_dev(bt541);
 	if (error) {
 		dev_err(&client->dev,
@@ -514,13 +523,6 @@ static int zinitix_ts_probe(struct i2c_c
 	}
 
 	irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
-	error = devm_request_threaded_irq(&client->dev, client->irq,
-					  NULL, zinitix_ts_irq_handler,
-					  IRQF_ONESHOT, client->name, bt541);
-	if (error) {
-		dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
-		return error;
-	}
 
 	return 0;
 }