[PATCH v2] Input: ar1021-i2c - fix too long name in driver's device table

[PATCH v2] Input: ar1021-i2c - fix too long name in driver's device table

[Dmitry Torokhov]

The name field in structure i2c_device_id is 20 characters, and we expect
it to be NULL-terminated, however we are trying to stuff it with 21 bytes
and thus NULL-terminator is lost. This causes issues when one creates
device with name "MICROCHIP_AR1021_I2C" as i2c core cuts off the last "C",
and automatic module loading by alias does not work as result.

The -I2C suffix in the device name is superfluous, we know what bus we are
dealing with, so let's drop it. Also, no other driver uses capitals, and
the manufacturer name is normally not included, except in very rare cases
of incompatible name collisions.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=116211
Fixes: dd4cae8bf166 ("Input: Add Microchip AR1021 i2c touchscreen")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

V2: Changed MICROCHIP_AR1021 -> ar1021 as Jean suggested.

 drivers/input/touchscreen/ar1021_i2c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/ar1021_i2c.c b/drivers/input/touchscreen/ar1021_i2c.c
index 2e7500edd477..6797e123925a 100644
--- a/drivers/input/touchscreen/ar1021_i2c.c
+++ b/drivers/input/touchscreen/ar1021_i2c.c
@@ -151,7 +151,7 @@ static int __maybe_unused ar1021_i2c_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(ar1021_i2c_pm, ar1021_i2c_suspend, ar1021_i2c_resume);
 
 static const struct i2c_device_id ar1021_i2c_id[] = {
-	{ "MICROCHIP_AR1021_I2C", 0 },
+	{ "ar1021", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id);
-- 
2.12.2.762.g0e3151a226-goog


-- 
Dmitry

Re: [PATCH v2] Input: ar1021-i2c - fix too long name in driver's device table

[Christian Gmeiner]

2017-04-14 1:32 GMT+02:00 Dmitry Torokhov <dmitry.torokhov@gmail.com>:
> The name field in structure i2c_device_id is 20 characters, and we expect
> it to be NULL-terminated, however we are trying to stuff it with 21 bytes
> and thus NULL-terminator is lost. This causes issues when one creates
> device with name "MICROCHIP_AR1021_I2C" as i2c core cuts off the last "C",
> and automatic module loading by alias does not work as result.
>
> The -I2C suffix in the device name is superfluous, we know what bus we are
> dealing with, so let's drop it. Also, no other driver uses capitals, and
> the manufacturer name is normally not included, except in very rare cases
> of incompatible name collisions.
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=116211
> Fixes: dd4cae8bf166 ("Input: Add Microchip AR1021 i2c touchscreen")
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-By: Christian Gmeiner <christian.gmeiner@gmail.com>

greets
--
Christian Gmeiner, MSc

https://www.youtube.com/user/AloryOFFICIAL
https://soundcloud.com/christian-gmeiner

Re: [PATCH v2] Input: ar1021-i2c - fix too long name in driver's device table

[Martin Kepplinger]

On 2017-04-14 01:32, Dmitry Torokhov wrote:
> The name field in structure i2c_device_id is 20 characters, and we expect
> it to be NULL-terminated, however we are trying to stuff it with 21 bytes
> and thus NULL-terminator is lost. This causes issues when one creates
> device with name "MICROCHIP_AR1021_I2C" as i2c core cuts off the last "C",
> and automatic module loading by alias does not work as result.
> 
> The -I2C suffix in the device name is superfluous, we know what bus we are
> dealing with, so let's drop it. Also, no other driver uses capitals, and
> the manufacturer name is normally not included, except in very rare cases
> of incompatible name collisions.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=116211
> Fixes: dd4cae8bf166 ("Input: Add Microchip AR1021 i2c touchscreen")
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Tested-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>

Re: [PATCH v2] Input: ar1021-i2c - fix too long name in driver's device table

[Jean Delvare]

On Thu, 13 Apr 2017 16:32:25 -0700, Dmitry Torokhov wrote:
> The name field in structure i2c_device_id is 20 characters, and we expect
> it to be NULL-terminated, however we are trying to stuff it with 21 bytes
> and thus NULL-terminator is lost. This causes issues when one creates
> device with name "MICROCHIP_AR1021_I2C" as i2c core cuts off the last "C",
> and automatic module loading by alias does not work as result.
> 
> The -I2C suffix in the device name is superfluous, we know what bus we are
> dealing with, so let's drop it. Also, no other driver uses capitals, and
> the manufacturer name is normally not included, except in very rare cases
> of incompatible name collisions.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=116211
> Fixes: dd4cae8bf166 ("Input: Add Microchip AR1021 i2c touchscreen")
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> ---
> 
> V2: Changed MICROCHIP_AR1021 -> ar1021 as Jean suggested.
> 
>  drivers/input/touchscreen/ar1021_i2c.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> (...)

Reviewed-by: Jean Delvare <jdelvare@suse.de>

> diff --git a/drivers/input/touchscreen/ar1021_i2c.c b/drivers/input/touchscreen/ar1021_i2c.c
> index 2e7500edd477..6797e123925a 100644
> --- a/drivers/input/touchscreen/ar1021_i2c.c
> +++ b/drivers/input/touchscreen/ar1021_i2c.c
> @@ -151,7 +151,7 @@ static int __maybe_unused ar1021_i2c_resume(struct device *dev)
>  static SIMPLE_DEV_PM_OPS(ar1021_i2c_pm, ar1021_i2c_suspend, ar1021_i2c_resume);
>  
>  static const struct i2c_device_id ar1021_i2c_id[] = {
> -	{ "MICROCHIP_AR1021_I2C", 0 },
> +	{ "ar1021", 0 },
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id);


-- 
Jean Delvare
SUSE L3 Support