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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <201305162103.11996.PeterHuewe@gmx.de>
Date:	Thu, 16 May 2013 21:03:11 +0200
From:	Peter Hüwe <PeterHuewe@....de>
To:	tpmdd-devel@...ts.sourceforge.net
Cc:	Mathias LEBLANC <Mathias.LEBLANC@...com>,
	"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 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/