From: Felipe Balbi <balbi@ti.com>
To: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>,
Greg KH <gregkh@linuxfoundation.org>, <balbi@ti.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@redhat.com>, <JBottomley@parallels.com>,
<linux-scsi@vger.kernel.org>, <davem@davemloft.net>,
<netdev@vger.kernel.org>,
Doug Thompson <dougthompson@xmission.com>,
<linux-edac@vger.kernel.org>, <rjw@sisk.pl>,
<linux-pm@vger.kernel.org>
Subject: Re: SYSFS "errors"
Date: Tue, 19 Feb 2013 12:11:21 +0200 [thread overview]
Message-ID: <20130219101121.GJ23197@arwen.pp.htv.fi> (raw)
In-Reply-To: <20130219070310.2cadad7a@redhat.com>
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Hi,
On Tue, Feb 19, 2013 at 07:03:10AM -0300, Mauro Carvalho Chehab wrote:
> > But my gut feeling says to stay concervative and not touch this code -
> > we don't know what uses it and how much we would break by "fixing" it.
> > The current situation is not that big of a deal IMVHO and I'd be willing
> > to accept the small inconcistency versus possibly breaking userspace.
>
> I remember I saw some discussions about it in the past at bluesmoke ML,
> saying that -ENODEV is the expected behavior when this is not supported.
>
> Changing from -ENODEV to "N/A" will break anything that would be relying
> on the previous behavior. So, I think that such change will for sure break
> userspace.
>
> If we're willing to change it, not creating the "sdram_scrub_rate" sysfs
> node is less likely to affect userspace.
yeah, I agree with this. Guess we shouldn't be creating files which
aren't supported by the underlying HW and having a read() return -ENODEV
is quite weird IMO since that's actually 'breaking' read() interface
although that's up to interpretations.
--
balbi
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next prev parent reply other threads:[~2013-02-19 10:12 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-18 15:33 SYSFS "errors" Felipe Balbi
2013-02-18 15:50 ` Greg KH
2013-02-18 15:52 ` Felipe Balbi
2013-02-18 17:13 ` Greg KH
2013-02-18 17:27 ` Felipe Balbi
2013-02-18 17:45 ` Borislav Petkov
2013-02-18 18:47 ` Felipe Balbi
2013-02-18 19:40 ` Borislav Petkov
2013-02-18 20:04 ` Felipe Balbi
2013-02-18 17:49 ` Greg KH
2013-02-18 18:46 ` Felipe Balbi
2013-02-18 19:46 ` Mauro Carvalho Chehab
2013-02-18 20:05 ` Felipe Balbi
2013-02-18 21:47 ` Mauro Carvalho Chehab
2013-02-18 21:54 ` Greg KH
2013-02-18 22:13 ` Borislav Petkov
2013-02-18 22:26 ` Greg KH
2013-02-18 22:44 ` Borislav Petkov
2013-02-19 10:03 ` Mauro Carvalho Chehab
2013-02-19 10:11 ` Felipe Balbi [this message]
2013-02-19 11:11 ` Mauro Carvalho Chehab
2013-02-19 11:43 ` Borislav Petkov
2013-02-19 12:16 ` Mauro Carvalho Chehab
2013-02-19 12:35 ` Borislav Petkov
2013-02-19 12:46 ` Mauro Carvalho Chehab
2013-02-19 13:06 ` Borislav Petkov
2013-02-19 13:15 ` Felipe Balbi
2013-02-19 13:28 ` Borislav Petkov
2013-02-19 13:38 ` Felipe Balbi
2013-02-19 13:50 ` Mauro Carvalho Chehab
2013-02-19 13:55 ` Borislav Petkov
2013-02-19 13:50 ` Borislav Petkov
2013-02-19 13:58 ` Hannes Reinecke
2013-02-19 14:10 ` Borislav Petkov
2013-02-19 14:14 ` Mauro Carvalho Chehab
2013-02-19 14:19 ` Felipe Balbi
2013-02-19 14:35 ` Mauro Carvalho Chehab
2013-02-19 14:50 ` Borislav Petkov
2013-02-19 14:53 ` Felipe Balbi
2013-02-19 13:42 ` Mauro Carvalho Chehab
2013-02-18 21:48 ` Alan Stern
2013-02-18 21:57 ` Felipe Balbi
2013-02-19 7:41 ` Alexander Stein
2013-02-19 10:12 ` Felipe Balbi
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