linux-kernel - Re: [PATCH v2 13/23] counter: Provide alternative counter registration functions

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Date:   Wed, 29 Dec 2021 15:49:29 +0200
From:   Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     William Breathitt Gray <vilhelm.gray@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>, kernel@...gutronix.de,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-iio@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 13/23] counter: Provide alternative counter
 registration functions

On 12/28/21 20:00, Jonathan Cameron wrote:
> On Mon, 27 Dec 2021 10:45:16 +0100
> Uwe Kleine-König         <u.kleine-koenig@...gutronix.de> wrote:
>> +	if (err < 0)
>> +		goto err_chrdev_add;
>> +
>> +	device_initialize(dev);
>> +	/* Configure device structure for Counter */
>> +	dev->type = &counter_device_type;
>> +	dev->bus = &counter_bus_type;
>> +	dev->devt = MKDEV(MAJOR(counter_devt), id);
> 
> As 0-day pointed out id not initialized.
> 
This was the reason why second counter instance initialization failed 
for me when testing the patch 17. I fixed it locally by changing the 
line a few rows above the MKDEV():

-	dev->id = err;
+	dev->id = id = err;