linux-kernel - [PATCH] Input: ads7846 - fix unaligned access on 7845

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Message-ID: <20201112012742.GA3608551@dtor-ws>
Date:   Wed, 11 Nov 2020 17:27:42 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     linux-input@...r.kernel.org
Cc:     Oleksij Rempel <linux@...pel-privat.de>,
        Anatolij Gustschin <agust@...x.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] Input: ads7846 - fix unaligned access on 7845

req->sample[1] is not naturally aligned at word boundary, and therefore
we should use get_unaligned_be16() when accessing it.

Fixes: 3eac5c7e44f3 ("Input: ads7846 - extend the driver for ads7845 controller support")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---

Not tested on hardware, so if somebody has the controller and can verify
that would be great.


 drivers/input/touchscreen/ads7846.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 95e89f675ad5..35d14bc44aff 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -33,6 +33,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/module.h>
 #include <asm/irq.h>
+#include <asm/unaligned.h>
 
 /*
  * This code has been heavily tested on a Nokia 770, and lightly
@@ -443,7 +444,7 @@ static int ads7845_read12_ser(struct device *dev, unsigned command)
 
 	if (status == 0) {
 		/* BE12 value, then padding */
-		status = be16_to_cpu(*((u16 *)&req->sample[1]));
+		status = get_unaligned_be16(&req->sample[1]);
 		status = status >> 3;
 		status &= 0x0fff;
 	}
-- 
2.29.2.222.g5d2a92d10f8-goog


-- 
Dmitry