linux-kernel - Re: [Patch 3/4] ST LIS3L02DQ accelerometer

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Date:	Wed, 23 Jul 2008 18:44:21 +0100
From:	Jonathan Cameron <Jonathan.Cameron@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	LKML <linux-kernel@...r.kernel.org>,
	spi-devel-general@...ts.sourceforge.net,
	LM Sensors <lm-sensors@...sensors.org>
Subject: Re: [Patch 3/4] ST LIS3L02DQ accelerometer

Dear Alan,
>> +
>> + xfer.rx_buf = kmalloc(4, GFP_KERNEL);
>> + if (xfer.rx_buf == NULL) {
>> + ret = -ENOMEM;
>> + goto error_free_tx;
>> + }
>
> Do these really need to be two kmallocs
Sorry about that, legacy of a much older version. I definitely didn't clean
this driver up properly (iio core is still a fair way off going anywhere so
I'll admit I didn't didn't check the drivers using it as thoroughly as I
should
have)
>
>> + if (ret) {
>> + dev_err(&st->us->dev, "problem with get x offset");
>> + goto error_free_rx;
>> + }
>> + *val = ((unsigned char *)(xfer.rx_buf))[0];
>> + kfree(xfer.rx_buf);
>> + kfree(xfer.tx_buf);
>> + return ret;
>> +error_free_rx:
>> + kfree(xfer.rx_buf);
>> +error_free_tx:
>> + kfree(xfer.tx_buf);
>> +error_ret:
>> + return ret;
>
> That lot makes no sense. You could just drop through..
Oops.
>> +{
>> + uint8_t val;
>> + int8_t ret;
>
> Kernel types (u8, s8 etc)
To used to userspace programming! I'll fix them.
>
>> + local_rx_buf = kmalloc(4, GFP_KERNEL);
>> + local_tx_buf = kmalloc(4, GFP_KERNEL);
>> +
>> + local_tx_buf[1] = LIS3L02DQ_READ_REG(reg_address);
>
> OOPS on out of memory case
Good point.
>

>
> You seem to have a lot of almost identical routines here. It looks like
> with a few helpers this driver could be vastly shorter.
Again a good point. I'll clean it up and repost.

Thanks for the hints,

--
Jonathan Cameron


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