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From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: ALSA Development Mailing List <alsa-devel@alsa-project.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	Paul Mackerras <paulus@samba.org>,
	scsi <linux-scsi@vger.kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Alan Stern <stern@rowland.harvard.edu>,
	Jakub Kicinski <kuba@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Geoff Levand <geoff@infradead.org>,
	netdev <netdev@vger.kernel.org>,
	USB list <linux-usb@vger.kernel.org>,
	Takashi Iwai <tiwai@suse.com>, Jim Paris <jim@jtan.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH 1/2] ALSA: ppc: drop if block with always false condition
Date: Fri, 27 Nov 2020 10:45:47 +0100	[thread overview]
Message-ID: <20201127094547.4zcyeycfrriitkqx@pengutronix.de> (raw)
In-Reply-To: <CAMuHMdUbfT7ax4BhjMT_DBweab8TDm5e=xMv5f61t9QpQJt1mw@mail.gmail.com>

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On Fri, Nov 27, 2020 at 09:35:39AM +0100, Geert Uytterhoeven wrote:
> Hi Uwe,
> 
> On Thu, Nov 26, 2020 at 6:03 PM Uwe Kleine-König
> <u.kleine-koenig@pengutronix.de> wrote:
> > The remove callback is only called for devices that were probed
> > successfully before. As the matching probe function cannot complete
> > without error if dev->match_id != PS3_MATCH_ID_SOUND, we don't have to
> > check this here.
> >
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> 
> Thanks for your patch!
> 
> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
> 
> Note that there are similar checks in snd_ps3_driver_probe(), which
> can be removed, too:
> 
>         if (WARN_ON(!firmware_has_feature(FW_FEATURE_PS3_LV1)))
>                 return -ENODEV;
>         if (WARN_ON(dev->match_id != PS3_MATCH_ID_SOUND))
>                 return -ENODEV;

I had to invest some brain cycles here. For the first:

Assuming firmware_has_feature(FW_FEATURE_PS3_LV1) always returns the
same value, snd_ps3_driver_probe is only used after this check succeeds
because the driver is registered only after this check in
snd_ps3_init().

The second is superflous because ps3_system_bus_match() yields false if
this doesn't match the driver's match_id.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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  reply	other threads:[~2020-11-27  9:48 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-26 16:59 [PATCH 1/2] ALSA: ppc: drop if block with always false condition Uwe Kleine-König
2020-11-26 16:59 ` [PATCH 2/2] powerpc/ps3: make system bus's remove and shutdown callbacks return void Uwe Kleine-König
2020-11-27  8:40   ` Geert Uytterhoeven
2020-11-27 19:39   ` Geoff Levand
2020-11-28  8:48   ` Takashi Iwai
2020-11-29 17:31     ` Uwe Kleine-König
2020-12-02 12:14       ` Michael Ellerman
2020-12-02 12:22         ` Takashi Iwai
2020-11-27  8:35 ` [PATCH 1/2] ALSA: ppc: drop if block with always false condition Geert Uytterhoeven
2020-11-27  9:45   ` Uwe Kleine-König [this message]
2020-11-27 15:22     ` [PATCH] ALSA: ppc: remove redundant checks in PS3 driver probe Leonard Goehrs
2020-11-27 17:34       ` Uwe Kleine-König
2020-11-27 19:39       ` Geoff Levand
2020-11-28  8:49       ` Takashi Iwai
2020-11-27 19:37 ` [PATCH 1/2] ALSA: ppc: drop if block with always false condition Geoff Levand
2020-11-28  8:48 ` Takashi Iwai

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