From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Sergei Shtylyov <sergei.shtylyov@gmail.com>
Cc: min.guo@mediatek.com, Bin Liu <b-liu@ti.com>,
Alan Stern <stern@rowland.harvard.edu>,
Matthias Brugger <matthias.bgg@gmail.com>,
chunfeng.yun@mediatek.com, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org
Subject: Re: [PATCH v3] usb: musb: remove unused variable 'devctl'
Date: Thu, 10 Dec 2020 16:01:03 +0100 [thread overview]
Message-ID: <X9I4L3E9EJlcPMEu@kroah.com> (raw)
In-Reply-To: <c2f3f643-8514-5c4a-dd52-7abc8a6dc501@gmail.com>
On Tue, Nov 24, 2020 at 12:13:42PM +0300, Sergei Shtylyov wrote:
> Hello!
>
> On 24.11.2020 11:49, min.guo@mediatek.com wrote:
>
> > From: Min Guo <min.guo@mediatek.com>
> >
> > 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 <min.guo@mediatek.com>
> > ---
> > changes in v3
> > suggested by Greg Kroah-Hartman:
> > Add a comment.
> >
> > changes in v2
> > suggested by Alan Stern:
> > Add void before musb_read to indicate that the register MUSB_DEVCTL
> > was intended to be read and discarded.
> > ---
> > drivers/usb/musb/musbhsdma.c | 8 +++++---
> > 1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
> > index 0aacfc8be5a1..2a345b4ad015 100644
> > --- a/drivers/usb/musb/musbhsdma.c
> > +++ b/drivers/usb/musb/musbhsdma.c
> [...]
> > @@ -336,7 +334,11 @@ irqreturn_t dma_controller_irq(int irq, void *private_data)
> > < musb_channel->len) ?
> > "=> reconfig 0" : "=> complete");
> > - devctl = musb_readb(mbase, MUSB_DEVCTL);
> > + /*
> > + * Some hardware may need to read the
> > + * MUSB_DEVCTL register once to take effect.
> > + */
> > + (void)musb_readb(mbase, MUSB_DEVCTL);
>
> Hm, forcibly reading DevCtl in the DMA driver... sounds quite
> nonsensically. Lemme take a look...
What happened to your look?
thanks,
greg k-h
WARNING: multiple messages have this Message-ID (diff)
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Sergei Shtylyov <sergei.shtylyov@gmail.com>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
chunfeng.yun@mediatek.com, Alan Stern <stern@rowland.harvard.edu>,
min.guo@mediatek.com, Matthias Brugger <matthias.bgg@gmail.com>,
linux-mediatek@lists.infradead.org, Bin Liu <b-liu@ti.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3] usb: musb: remove unused variable 'devctl'
Date: Thu, 10 Dec 2020 16:01:03 +0100 [thread overview]
Message-ID: <X9I4L3E9EJlcPMEu@kroah.com> (raw)
In-Reply-To: <c2f3f643-8514-5c4a-dd52-7abc8a6dc501@gmail.com>
On Tue, Nov 24, 2020 at 12:13:42PM +0300, Sergei Shtylyov wrote:
> Hello!
>
> On 24.11.2020 11:49, min.guo@mediatek.com wrote:
>
> > From: Min Guo <min.guo@mediatek.com>
> >
> > 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 <min.guo@mediatek.com>
> > ---
> > changes in v3
> > suggested by Greg Kroah-Hartman:
> > Add a comment.
> >
> > changes in v2
> > suggested by Alan Stern:
> > Add void before musb_read to indicate that the register MUSB_DEVCTL
> > was intended to be read and discarded.
> > ---
> > drivers/usb/musb/musbhsdma.c | 8 +++++---
> > 1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
> > index 0aacfc8be5a1..2a345b4ad015 100644
> > --- a/drivers/usb/musb/musbhsdma.c
> > +++ b/drivers/usb/musb/musbhsdma.c
> [...]
> > @@ -336,7 +334,11 @@ irqreturn_t dma_controller_irq(int irq, void *private_data)
> > < musb_channel->len) ?
> > "=> reconfig 0" : "=> complete");
> > - devctl = musb_readb(mbase, MUSB_DEVCTL);
> > + /*
> > + * Some hardware may need to read the
> > + * MUSB_DEVCTL register once to take effect.
> > + */
> > + (void)musb_readb(mbase, MUSB_DEVCTL);
>
> Hm, forcibly reading DevCtl in the DMA driver... sounds quite
> nonsensically. Lemme take a look...
What happened to your look?
thanks,
greg k-h
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek
WARNING: multiple messages have this Message-ID (diff)
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Sergei Shtylyov <sergei.shtylyov@gmail.com>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
chunfeng.yun@mediatek.com, Alan Stern <stern@rowland.harvard.edu>,
min.guo@mediatek.com, Matthias Brugger <matthias.bgg@gmail.com>,
linux-mediatek@lists.infradead.org, Bin Liu <b-liu@ti.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3] usb: musb: remove unused variable 'devctl'
Date: Thu, 10 Dec 2020 16:01:03 +0100 [thread overview]
Message-ID: <X9I4L3E9EJlcPMEu@kroah.com> (raw)
In-Reply-To: <c2f3f643-8514-5c4a-dd52-7abc8a6dc501@gmail.com>
On Tue, Nov 24, 2020 at 12:13:42PM +0300, Sergei Shtylyov wrote:
> Hello!
>
> On 24.11.2020 11:49, min.guo@mediatek.com wrote:
>
> > From: Min Guo <min.guo@mediatek.com>
> >
> > 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 <min.guo@mediatek.com>
> > ---
> > changes in v3
> > suggested by Greg Kroah-Hartman:
> > Add a comment.
> >
> > changes in v2
> > suggested by Alan Stern:
> > Add void before musb_read to indicate that the register MUSB_DEVCTL
> > was intended to be read and discarded.
> > ---
> > drivers/usb/musb/musbhsdma.c | 8 +++++---
> > 1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
> > index 0aacfc8be5a1..2a345b4ad015 100644
> > --- a/drivers/usb/musb/musbhsdma.c
> > +++ b/drivers/usb/musb/musbhsdma.c
> [...]
> > @@ -336,7 +334,11 @@ irqreturn_t dma_controller_irq(int irq, void *private_data)
> > < musb_channel->len) ?
> > "=> reconfig 0" : "=> complete");
> > - devctl = musb_readb(mbase, MUSB_DEVCTL);
> > + /*
> > + * Some hardware may need to read the
> > + * MUSB_DEVCTL register once to take effect.
> > + */
> > + (void)musb_readb(mbase, MUSB_DEVCTL);
>
> Hm, forcibly reading DevCtl in the DMA driver... sounds quite
> nonsensically. Lemme take a look...
What happened to your look?
thanks,
greg k-h
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-12-10 15:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-24 8:49 [PATCH v3] usb: musb: remove unused variable 'devctl' min.guo
2020-11-24 8:49 ` min.guo
2020-11-24 8:49 ` min.guo
2020-11-24 9:13 ` Sergei Shtylyov
2020-11-24 9:13 ` Sergei Shtylyov
2020-11-24 9:13 ` Sergei Shtylyov
2020-11-24 11:45 ` Sergei Shtylyov
2020-11-24 11:45 ` Sergei Shtylyov
2020-11-24 11:45 ` Sergei Shtylyov
2020-12-10 15:01 ` Greg Kroah-Hartman [this message]
2020-12-10 15:01 ` Greg Kroah-Hartman
2020-12-10 15:01 ` Greg Kroah-Hartman
2020-12-10 17:33 ` Sergei Shtylyov
2020-12-10 17:33 ` Sergei Shtylyov
2020-12-10 17:33 ` Sergei Shtylyov
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