Re: [PATCH 1/2] staging: iio replaced kmalloc with local variables.

From: Jonathan Cameron
Date: Tue Jun 07 2011 - 05:27:55 EST

On 06/06/11 23:10, Joe Perches wrote:
> On Mon, 2011-06-06 at 14:55 -0700, Greg KH wrote:
>> On Tue, Jun 07, 2011 at 12:37:37AM +0530, anish wrote:
>>> From: anish kumar <anish198519851985@xxxxxxxxx>
>>> Replace kmalloc with local variables as it was un-necessary and
>>> also removed the redudant code after this change.
>> SPI data, like USB data, has to come from kmalloced data, not from the
>> stack, or bad things can, and will, happen.
> Perhaps just add a comment like:
> + u8 *tx = kmalloc(2, GFP_KERNEL); /* can't be on stack */
> It might be better to do a single kmalloc(4)
> than 2 separate kmalloc(2)'s.
Actually, this little corner of the driver is the only place it isn't
using the buffers allocated with the chip state. After I send our
latest clean up series in these are all explicitly marked
____cacheline_aligned anyway which should make it clear something
a little unusual is going on.

I'll clean up this function and credit it to Anish (if Anish doesn't
mind of course!)

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