linux-kernel - Re: [PATCH 2/7] MFD: ASIC3: add clock handling for MFD cells

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: <74d0deb30906050927i428f732ehc76ac592c87d44b3@mail.gmail.com>
Date:	Fri, 5 Jun 2009 18:27:20 +0200
From:	pHilipp Zabel <philipp.zabel@...il.com>
To:	Samuel Ortiz <sameo@...nedhand.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] MFD: ASIC3: add clock handling for MFD cells

On Fri, Jun 5, 2009 at 1:49 AM, Samuel Ortiz<sameo@...nedhand.com> wrote:
> Hi Philipp,
>
> On Thu, Jun 04, 2009 at 08:36:11PM +0200, Philipp Zabel wrote:
>> +
>> +struct asic3_clk {
>> +     int enabled;
> You probably want to use a kref here.
>
>> +static int asic3_clk_enable(struct asic3 *asic, struct asic3_clk *clk)
>> +{
>> +     unsigned long flags;
>> +     u32 cdex;
>> +
>> +     spin_lock_irqsave(&asic->lock, flags);
>> +     if (clk->enabled++ == 0) {
> using the kref API here would definitely be nicer.

While I agree that the kref API looks nice, I'm not convinced it is
intended to be used in this case. We are not counting references here.
There is no way to get the count back from the API, which we need to
decide whether or not to flip the CDEX bits. We could misuse the
release function pointer given to kref_put to turn off the clock, but
I'd prefer to leave it the way it is now.

regards
Philipp
--
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/