linux-kernel - Re: [PATCH 1/2] usb_gigaset: suspend support [v2]

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Message-ID: <472A18D7.7020703@imap.cc>
Date:	Thu, 01 Nov 2007 19:20:07 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, gregkh@...e.de,
	linux-usb-devel@...ts.sourceforge.net, hjlipp@....de,
	kkeil@...e.de, i4ldeveloper@...tserv.isdn4linux.de
Subject: Re: [PATCH 1/2] usb_gigaset: suspend support [v2]

Am 30.10.2007 22:01 schrieb Andrew Morton:
> On Mon, 29 Oct 2007 22:41:30 +0100 (CET)
> Tilman Schmidt <tilman@...p.cc> wrote:
> 
>> From: Tilman Schmidt <tilman@...p.cc>
>>
>> Add basic suspend/resume support to the usb_gigaset driver.
>> (Corrected version.)
>>
> 
> You're not a big fan of checkpatch, I see.

Sorry. I promise to mend my ways.

>> +static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
>> +{
>> +	struct cardstate *cs;
>> +	struct usb_cardstate *ucs;
>> +
>> +	if ((cs = usb_get_intfdata(intf)) == NULL ||
>> +	    (ucs = cs->hw.usb) == NULL) {
>> +		err("%s: no cardstate", __func__);
>> +		return -EFAULT;
>> +	}
> 
> Is the above reeeeeely needed?  I bet it never happens.

I'm a great believer in defensive programming. :-)

Anyway, to be sure these checks aren't needed, I would need the
assurance that the suspend and resume methods are serialized with
the probe and disconnect methods. Are they?

Thanks,
Tilman

-- 
Tilman Schmidt                          E-Mail: tilman@...p.cc
Bonn, Germany
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