linux-kernel - Re: Re: [PATCH] Serial: BUGFIX: uart_resume

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Message-id: <15814028.20691287119419827.JavaMail.weblogic@epv6ml08>
Date:	Fri, 15 Oct 2010 05:10:21 +0000 (GMT)
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	Stanislav Brabec <sbrabec@...e.cz>, Greg KH <greg@...ah.com>
Cc:	Greg KH <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	박경민 <kyungmin.park@...sung.com>,
	Alan Cox <alan@...ux.intel.com>, Arnd Bergmann <arnd@...db.de>,
	Andr Goddard Rosa <andre.goddard@...il.com>,
	Jason Wang <jason77.wang@...il.com>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
Subject: Re: Re: [PATCH] Serial: BUGFIX: uart_resume_port has an omitted
 condition.

> Greg KH wrote: 
> > > This disparity appeared deliberately in 4547be78. If you need
> > > no_console_suspend and the hardware lets the device in an undefined
> > > state after resume (i. e. PXA270), you need to call subset of the
> > > resume, even if the suspend counterpart was not called. Yes, I can
> > > imagine that it may be a source of problems.
> 
> > > It seems that support for no_console_suspend for all devices is becoming
> > > more complicated. I guess that a new driver calls (maybe "save_state"
> > > and "resume_state") or support for no_console_suspend directly in
> > > drivers may be useful.
> > 
> > Ok, so I'm guessing that this patch is not to be applied then, correct?
> 
> I just compared it with Jason Wang's patches. MyungJoo Ham's patch is
> exactly equal to the PATCH 1/2. So it already has my ACK and it is
> pending as:
> 
> serial-core: skip call set_termios/console_start when no_console_suspend
> 
> Related thread can be found in linux-serial archives from August 2010:
> [PATCH RESEND 0/2] two serial_core suspend/resume fixes
> 
> To MyungJoo Ham: Could you verify, that Jason Wang's patch 2/2 does not
> break your system? My patch to fix PXA270 does not exist yet. I'll ask
> you in future for testing.

With Jason Wang's patch, it works fine. I'm applying Wang's 1/2 and 2/2 to mine.

Thank you.

> 
> -- 
> Best Regards / S pozdravem,
> 
> Stanislav Brabec
> software developer
> ---------------------------------------------------------------------
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 MyungJoo Ham (함명주)
Mobile Software Platform Lab,
Digital Media and Communications (DMC) Business
Samsung Electronics
cell: +82-10-6714-2858 / office: +82-31-279-8033