linux-kernel - Re: Issue with porting i2c driver to k3.10 (iio)

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Date:	Thu, 4 Jul 2013 09:19:11 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
Cc:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, jic23@....ac.uk
Subject: Re: Issue with porting i2c driver to k3.10 (iio)

On Thu, Jul 04, 2013 at 04:16:43PM +0300, Oleksandr Kravchenko wrote:
> Hi All,
> 
> I wrote i2c driver for APDS-9300 light sensor in drivers/misc, but I have some
> questions regarding upstreaming of it.
> 1. It works properly in kernel-3.4, but it works very slow in kernel-3.10 (on
> mutex and i2c operations, particulary on mutex_lock() and i2c_smbus_read_data
> ()). Does anyone know why this issue may be occurred?

What is "slow"?  Have you run 'perf' on the driver to see where it is
spending time?

> 2. Can I send this driver without using Industrial I/O framework?

No, why would you even want to?

greg k-h
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