linux-kernel - [PATCH v3 1/6] input: zinitix: Make sure the IRQ is allocated before it gets enabled

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Message-Id: <20220106072840.36851-2-nikita@trvn.ru>
Date:   Thu,  6 Jan 2022 12:28:35 +0500
From:   Nikita Travkin <nikita@...n.ru>
To:     dmitry.torokhov@...il.com
Cc:     robh+dt@...nel.org, Michael.Srba@...nam.cz,
        linus.walleij@...aro.org, broonie@...nel.org, luca@...tu.xyz,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        phone-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Nikita Travkin <nikita@...n.ru>
Subject: [PATCH v3 1/6] input: zinitix: Make sure the IRQ is allocated before it gets enabled

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>
---
 drivers/input/touchscreen/zinitix.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscreen/zinitix.c
index b8d901099378..1e70b8d2a8d7 100644
--- a/drivers/input/touchscreen/zinitix.c
+++ b/drivers/input/touchscreen/zinitix.c
@@ -488,6 +488,15 @@ static int zinitix_ts_probe(struct i2c_client *client)
 		return error;
 	}
 
+	error = devm_request_threaded_irq(&client->dev, client->irq,
+					  NULL, zinitix_ts_irq_handler,
+					  IRQF_ONESHOT | IRQF_NO_AUTOEN,
+					  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,
@@ -513,15 +522,6 @@ static int zinitix_ts_probe(struct i2c_client *client)
 		return -EINVAL;
 	}
 
-	error = devm_request_threaded_irq(&client->dev, client->irq,
-					  NULL, zinitix_ts_irq_handler,
-					  IRQF_ONESHOT | IRQF_NO_AUTOEN,
-					  client->name, bt541);
-	if (error) {
-		dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
-		return error;
-	}
-
 	return 0;
 }
 
-- 
2.30.2