From: Thomas Zimmermann <tzimmermann@suse.de>
To: Xu Wang <vulab@iscas.ac.cn>
Cc: b.zolnierkie@samsung.com, jani.nikula@intel.com,
daniel.vetter@ffwll.ch, linux-fbdev@vger.kernel.org,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] au1100fb: Remove NULL pointer check before clk_enable/disable
Date: Thu, 15 Oct 2020 10:05:57 +0200 [thread overview]
Message-ID: <20201015100557.402f831f@linux-uq9g> (raw)
In-Reply-To: <20201014082137.23320-1-vulab@iscas.ac.cn>
Hi
On Wed, 14 Oct 2020 08:21:37 +0000 Xu Wang <vulab@iscas.ac.cn> wrote:
> Because clk_enable, clk_disable, clk_prepare, and clk_unprepare already
> checked NULL clock parameter, so the additional checks are unnecessary,
> just remove them.
All clk_*() functions seem to handle NULL pointers gracefully, so you can
also remove these checks from the driver's _probe and _remove functions.
Best regards
Thomas
>
> Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
> ---
> drivers/video/fbdev/au1100fb.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/video/fbdev/au1100fb.c b/drivers/video/fbdev/au1100fb.c
> index 37a6512feda0..3659dfbb81c1 100644
> --- a/drivers/video/fbdev/au1100fb.c
> +++ b/drivers/video/fbdev/au1100fb.c
> @@ -560,8 +560,7 @@ int au1100fb_drv_suspend(struct platform_device *dev,
> pm_message_t state) /* Blank the LCD */
> au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
>
> - if (fbdev->lcdclk)
> - clk_disable(fbdev->lcdclk);
> + clk_disable(fbdev->lcdclk);
>
> memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
>
> @@ -577,8 +576,7 @@ int au1100fb_drv_resume(struct platform_device *dev)
>
> memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
>
> - if (fbdev->lcdclk)
> - clk_enable(fbdev->lcdclk);
> + clk_enable(fbdev->lcdclk);
>
> /* Unblank the LCD */
> au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Zimmermann <tzimmermann@suse.de>
To: Xu Wang <vulab@iscas.ac.cn>
Cc: linux-fbdev@vger.kernel.org, b.zolnierkie@samsung.com,
jani.nikula@intel.com, daniel.vetter@ffwll.ch,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] au1100fb: Remove NULL pointer check before clk_enable/disable
Date: Thu, 15 Oct 2020 08:05:57 +0000 [thread overview]
Message-ID: <20201015100557.402f831f@linux-uq9g> (raw)
In-Reply-To: <20201014082137.23320-1-vulab@iscas.ac.cn>
Hi
On Wed, 14 Oct 2020 08:21:37 +0000 Xu Wang <vulab@iscas.ac.cn> wrote:
> Because clk_enable, clk_disable, clk_prepare, and clk_unprepare already
> checked NULL clock parameter, so the additional checks are unnecessary,
> just remove them.
All clk_*() functions seem to handle NULL pointers gracefully, so you can
also remove these checks from the driver's _probe and _remove functions.
Best regards
Thomas
>
> Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
> ---
> drivers/video/fbdev/au1100fb.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/video/fbdev/au1100fb.c b/drivers/video/fbdev/au1100fb.c
> index 37a6512feda0..3659dfbb81c1 100644
> --- a/drivers/video/fbdev/au1100fb.c
> +++ b/drivers/video/fbdev/au1100fb.c
> @@ -560,8 +560,7 @@ int au1100fb_drv_suspend(struct platform_device *dev,
> pm_message_t state) /* Blank the LCD */
> au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
>
> - if (fbdev->lcdclk)
> - clk_disable(fbdev->lcdclk);
> + clk_disable(fbdev->lcdclk);
>
> memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
>
> @@ -577,8 +576,7 @@ int au1100fb_drv_resume(struct platform_device *dev)
>
> memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
>
> - if (fbdev->lcdclk)
> - clk_enable(fbdev->lcdclk);
> + clk_enable(fbdev->lcdclk);
>
> /* Unblank the LCD */
> au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Zimmermann <tzimmermann@suse.de>
To: Xu Wang <vulab@iscas.ac.cn>
Cc: linux-fbdev@vger.kernel.org, b.zolnierkie@samsung.com,
jani.nikula@intel.com, daniel.vetter@ffwll.ch,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] au1100fb: Remove NULL pointer check before clk_enable/disable
Date: Thu, 15 Oct 2020 10:05:57 +0200 [thread overview]
Message-ID: <20201015100557.402f831f@linux-uq9g> (raw)
In-Reply-To: <20201014082137.23320-1-vulab@iscas.ac.cn>
Hi
On Wed, 14 Oct 2020 08:21:37 +0000 Xu Wang <vulab@iscas.ac.cn> wrote:
> Because clk_enable, clk_disable, clk_prepare, and clk_unprepare already
> checked NULL clock parameter, so the additional checks are unnecessary,
> just remove them.
All clk_*() functions seem to handle NULL pointers gracefully, so you can
also remove these checks from the driver's _probe and _remove functions.
Best regards
Thomas
>
> Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
> ---
> drivers/video/fbdev/au1100fb.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/video/fbdev/au1100fb.c b/drivers/video/fbdev/au1100fb.c
> index 37a6512feda0..3659dfbb81c1 100644
> --- a/drivers/video/fbdev/au1100fb.c
> +++ b/drivers/video/fbdev/au1100fb.c
> @@ -560,8 +560,7 @@ int au1100fb_drv_suspend(struct platform_device *dev,
> pm_message_t state) /* Blank the LCD */
> au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
>
> - if (fbdev->lcdclk)
> - clk_disable(fbdev->lcdclk);
> + clk_disable(fbdev->lcdclk);
>
> memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
>
> @@ -577,8 +576,7 @@ int au1100fb_drv_resume(struct platform_device *dev)
>
> memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
>
> - if (fbdev->lcdclk)
> - clk_enable(fbdev->lcdclk);
> + clk_enable(fbdev->lcdclk);
>
> /* Unblank the LCD */
> au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-10-15 8:08 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-14 8:21 [PATCH] au1100fb: Remove NULL pointer check before clk_enable/disable Xu Wang
2020-10-14 8:21 ` Xu Wang
2020-10-14 8:21 ` Xu Wang
2020-10-15 8:05 ` Thomas Zimmermann [this message]
2020-10-15 8:05 ` Thomas Zimmermann
2020-10-15 8:05 ` Thomas Zimmermann
2020-10-19 7:21 ` Thomas Zimmermann
2020-10-19 7:21 ` Thomas Zimmermann
2020-10-19 7:21 ` Thomas Zimmermann
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201015100557.402f831f@linux-uq9g \
--to=tzimmermann@suse.de \
--cc=b.zolnierkie@samsung.com \
--cc=daniel.vetter@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=jani.nikula@intel.com \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=vulab@iscas.ac.cn \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.