linux-kernel - RE: [tpmdd-devel] [PATCH 1/1] TPM: STMicroelectronics st33 driver SPI

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Date:	Fri, 17 May 2013 14:26:04 +0200
From:	Mathias LEBLANC <Mathias.LEBLANC@...com>
To:	Peter Hüwe <PeterHuewe@....de>,
	"tpmdd-devel@...ts.sourceforge.net" 
	<tpmdd-devel@...ts.sourceforge.net>
Cc:	Jean-Luc BLANC <jean-luc.blanc@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rajiv Andrade <mail@...jiv.net>, Sirrix AG <tpmdd@...rix.com>
Subject: RE: [tpmdd-devel] [PATCH 1/1] TPM: STMicroelectronics st33 driver
 SPI

Hi Peter, 

Thanks for this new function.
I had already changed the for loop but i would to be sure that it's the best way and that you expected.

Don't hesitate if you have any other recommendation or any comments for this driver.

Regards,

Mathias Leblanc
________________________________________
From: Peter Hüwe [PeterHuewe@....de]
Sent: 16 May 2013 21:03
To: tpmdd-devel@...ts.sourceforge.net
Cc: Mathias LEBLANC; Jean-Luc BLANC; linux-kernel@...r.kernel.org; Rajiv Andrade; Sirrix AG
Subject: Re: [tpmdd-devel] [PATCH 1/1] TPM: STMicroelectronics st33 driver SPI

Hi Matthias:

> Regarding the while loop, I don't see how can I check the number of dummy
> byte differently?

Checking the number of dummy bytes is fine -
in line #144 you check it with a while loop which looks fine
in line #198 you check it with a for loop with an empty body, which in my
opinion looks less nice than the while in #144.

So simply replace the second instance in #198 and I'm happy with that part ;)

Maybe also have a look at memchr_inv

/**
 * memchr_inv - Find an unmatching character in an area of memory.
 * @start: The memory area
 * @c: Find a character other than c
 * @bytes: The size of the area.
 *
 * returns the address of the first character other than @c, or %NULL
 * if the whole buffer contains just @c.
 */
void *memchr_inv(const void *start, int c, size_t bytes)

so #198 would look something like:
nbr_dummy_bytes = memchr_inv (xfer.rx_buf+nbr_dummy_bytes,
                                        0,
                                         total_length-nbr_dummy_bytes) - xfer.rx_buf;

But I'm not sure whether that's more readable, maybe give it a try.
 I'm also fine with the while loop.

Peter

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