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Fri, 20 Nov 2020 01:02:09 -0800 Received: from MTKMBS31N2.mediatek.inc (172.27.4.87) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 20 Nov 2020 01:02:20 -0800 Received: from MTKCAS32.mediatek.inc (172.27.4.184) by MTKMBS31N2.mediatek.inc (172.27.4.87) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 20 Nov 2020 17:02:16 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS32.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 20 Nov 2020 17:02:15 +0800 Message-ID: <1605862935.3995.20.camel@mhfsdcap03> Subject: Re: [PATCH] usb: musb: remove unused variable 'devctl' From: Min Guo To: Greg Kroah-Hartman Date: Fri, 20 Nov 2020 17:02:15 +0800 In-Reply-To: References: <20201117082125.7619-1-min.guo@mediatek.com> <1605854930.3995.8.camel@mhfsdcap03> <1605858126.3995.14.camel@mhfsdcap03> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: F523D46BD23D8F2D4C4167306D0A9C11AFC2932A6549B7623E792AD4C4C739792000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201120_040226_627915_ADE4EECC X-CRM114-Status: GOOD ( 30.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, chunfeng.yun@mediatek.com, linux-mediatek@lists.infradead.org, Matthias Brugger , Bin Liu , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 2020-11-20 at 09:36 +0100, Greg Kroah-Hartman wrote: > On Fri, Nov 20, 2020 at 03:42:06PM +0800, Min Guo wrote: > > On Fri, 2020-11-20 at 07:54 +0100, Greg Kroah-Hartman wrote: > > > On Fri, Nov 20, 2020 at 02:48:50PM +0800, Min Guo wrote: > > > > Hi greg k-h: > > > > On Wed, 2020-11-18 at 12:48 +0100, Greg Kroah-Hartman wrote: > > > > > On Tue, Nov 17, 2020 at 04:21:25PM +0800, min.guo@mediatek.com wrote: > > > > > > From: Min Guo > > > > > > > > > > > > Remove unused 'devctl' variable to fix compile warnings: > > > > > > > > > > > > drivers/usb/musb/musbhsdma.c: In function 'dma_controller_irq': > > > > > > drivers/usb/musb/musbhsdma.c:324:8: warning: variable 'devctl' set > > > > > > but not used [-Wunused-but-set-variable] > > > > > > > > > > > > Signed-off-by: Min Guo > > > > > > --- > > > > > > drivers/usb/musb/musbhsdma.c | 4 ---- > > > > > > 1 file changed, 4 deletions(-) > > > > > > > > > > > > diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c > > > > > > index 0aacfc8be5a1..7acd1635850d 100644 > > > > > > --- a/drivers/usb/musb/musbhsdma.c > > > > > > +++ b/drivers/usb/musb/musbhsdma.c > > > > > > @@ -321,8 +321,6 @@ irqreturn_t dma_controller_irq(int irq, void *private_data) > > > > > > musb_channel->channel.status = > > > > > > MUSB_DMA_STATUS_BUS_ABORT; > > > > > > } else { > > > > > > - u8 devctl; > > > > > > - > > > > > > addr = musb_read_hsdma_addr(mbase, > > > > > > bchannel); > > > > > > channel->actual_len = addr > > > > > > @@ -336,8 +334,6 @@ irqreturn_t dma_controller_irq(int irq, void *private_data) > > > > > > < musb_channel->len) ? > > > > > > "=> reconfig 0" : "=> complete"); > > > > > > > > > > > > - devctl = musb_readb(mbase, MUSB_DEVCTL); > > > > > > > > > > Are you sure that the hardware does not require this read to complete > > > > > the command? Lots of hardware is that way, so be very careful about > > > > > this. Did you test it? > > > > > > > > I have tested this patch on Mediatek's platform, and not sure if it > > > > will affect other vendors' platforms. > > > > > > > > Dear Bin: > > > > > > > > Does this patch will affect other vendors' platforms? > > > > > > The hardware specs will answer this question, what do they say about > > > this read? > > > > Sorry, I didn't seen the comment on the hardware specs indicate that > > devctl register needs to read once to take effect. > > Perhaps you might want to add a comment here so that people will not > keep making this same mistake when they run auto-checkers on the > codebase? Sorry for confused you, I searched the hardware specs, but did not find the special description of the register devctl indicating that it needs to be read out before the hardware can work. > thanks, > > greg k-h _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel