linux-kernel - RE: [PATCH] Input: serio: make HYPERV_KEYBOARD depend on SERIO

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Message-ID: <EE124450C0AAF944A40DD71E61F878C9929597@SINEX14MBXC417.southpacific.corp.microsoft.com>
Date:	Thu, 14 Aug 2014 06:07:11 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Greg KH <gregkh@...uxfoundation.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH] Input: serio: make HYPERV_KEYBOARD depend on
 SERIO_I8042=y

> -----Original Message-----
> From: Dmitry Torokhov
> > How about this:
> > in libps2.c let's add  and export a function pointer
> > i8042_lock_chip_if_port_owner: it is used to replace the current
> > 	if (i8042_check_port_owner(ps2dev->serio))
> > 		i8042_lock_chip();
> > The function pointer has a default value NULL, and in i8042.c: i8042_init()
> > we set the function pointer if an i8042 device is found?
> 
> Hmm, that would make i8042 depend on libps2, which might be OK, but how
> do you deal with the locking here? I.e. what happens if you unload i8042
> right when we go through this sequence?
Ok, I got it.

> Maybe we need to split i8042_lock_chip() and friends into a separate
> module that always loads, even if i8042 is not present.
> Dmitry
Good idea!

However the more difficult thing is 
i8042_check_port_owner() -- used by  libps2.c too.
Then  the separate module will also have to include and EXPORT
	DEFINE_SPINLOCK(i8042_lock);
	struct i8042_port i8042_ports[I8042_NUM_PORTS];
?

This seems a non-trivial change... :-(

Thanks,
-- Dexuan
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