linux-kernel - Re: [PATCH v1 1/3] platform/x86: thinkpad_acpi: Make logic straight in hotkey

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Date:   Tue, 09 May 2017 20:28:51 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:     Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/3] platform/x86: thinkpad_acpi: Make logic straight
 in hotkey_exit()

On Tue, 2017-05-09 at 14:02 -0300, Henrique de Moraes Holschuh wrote:

Thanks for review, my comments below.

> On Tue, 09 May 2017, Andy Shevchenko wrote:
> > The commit 4be73005e4dc
> > 
> > 	("thinkpad-acpi: remove uneeded tp_features.hotkey tests in
> > hotkey_exit")
> > 
> > adds a complex logic behind hotkey status check in a way
> > it started mixing logical operations with bitwise ones.
> > 
> > Refactor the code to make it straight and slightly clearer.
> 
> Eh, I find this actually less clear, given the comment that was in the
> old code, which you deleted.

For me doing 'bitwise or' on negative return code and boolean looks
weird...

> 
> Please keep the important part of the comment at the very least.

...that's why comment has been added I suppose, and my patch makes it
not needed.

Though, I better just drop the change completely, I didn't pay attention
if compiler warns about current implementation, I think it should.

> 
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> >  drivers/platform/x86/thinkpad_acpi.c | 9 ++++-----
> >  1 file changed, 4 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/platform/x86/thinkpad_acpi.c
> > b/drivers/platform/x86/thinkpad_acpi.c
> > index 7b6cb0c69b02..7740b5e1b998 100644
> > --- a/drivers/platform/x86/thinkpad_acpi.c
> > +++ b/drivers/platform/x86/thinkpad_acpi.c
> > @@ -3090,6 +3090,8 @@ static void tpacpi_send_radiosw_update(void)
> >  
> >  static void hotkey_exit(void)
> >  {
> > +	int res;
> > +
> >  #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
> >  	mutex_lock(&hotkey_mutex);
> >  	hotkey_poll_stop_sync();
> > @@ -3101,11 +3103,8 @@ static void hotkey_exit(void)
> >  
> >  	dbg_printk(TPACPI_DBG_EXIT | TPACPI_DBG_HKEY,
> >  		   "restoring original HKEY status and mask\n");
> > -	/* yes, there is a bitwise or below, we want the
> > -	 * functions to be called even if one of them fail */
> > -	if (((tp_features.hotkey_mask &&
> > -	      hotkey_mask_set(hotkey_orig_mask)) |
> > -	     hotkey_status_set(false)) != 0)
> > +	res = tp_features.hotkey_mask ?
> > hotkey_mask_set(hotkey_orig_mask) : 0;
> > +	if (hotkey_status_set(false) || res)
> >  		pr_err("failed to restore hot key mask "
> >  		       "to BIOS defaults\n");
> >  }
> 
> 

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy