linux-kernel - Re: [PATCH] usb: musb: dsps: remove the duplicated timer

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Date:   Mon, 30 Oct 2017 14:29:54 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: musb: dsps: remove the duplicated timer

On Mon, Oct 30, 2017 at 9:29 AM, Bin Liu <b-liu@...com> wrote:
> Now struct musb has the timer (dev_timer) for glue drivers, so let's
> remove the duplicated timer defined in dsps glue driver, and use
> dev_timer defined in struct musb.
>
> Signed-off-by: Bin Liu <b-liu@...com>

Reviewed-by: Kees Cook <keescook@...omium.org>

Thanks for this; it wasn't clear to me if both timers needed to exist
(i.e. glue operated independently from the musb object), so I didn't
make this change myself.

Greg, it probably makes sense to just take both patches. Does that work for you?

-Kees

> ---
>
> This is the fixup patch for [1].
>
> [1] https://marc.info/?l=linux-usb&m=150936947225302&w=2
>
>  drivers/usb/musb/musb_dsps.c | 17 ++++++++---------
>  1 file changed, 8 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
> index e3d0e626a5d6..4d95fe714f27 100644
> --- a/drivers/usb/musb/musb_dsps.c
> +++ b/drivers/usb/musb/musb_dsps.c
> @@ -119,7 +119,6 @@ struct dsps_glue {
>         struct platform_device *musb;   /* child musb pdev */
>         const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */
>         int vbus_irq;                   /* optional vbus irq */
> -       struct timer_list timer;        /* otg_workaround timer */
>         unsigned long last_timer;    /* last timer data for each instance */
>         bool sw_babble_enabled;
>         void __iomem *usbss_base;
> @@ -149,6 +148,7 @@ struct dsps_glue {
>
>  static void dsps_mod_timer(struct dsps_glue *glue, int wait_ms)
>  {
> +       struct musb *musb = platform_get_drvdata(glue->musb);
>         int wait;
>
>         if (wait_ms < 0)
> @@ -156,7 +156,7 @@ static void dsps_mod_timer(struct dsps_glue *glue, int wait_ms)
>         else
>                 wait = msecs_to_jiffies(wait_ms);
>
> -       mod_timer(&glue->timer, jiffies + wait);
> +       mod_timer(&musb->dev_timer, jiffies + wait);
>  }
>
>  /*
> @@ -216,7 +216,7 @@ static void dsps_musb_disable(struct musb *musb)
>         musb_writel(reg_base, wrp->coreintr_clear, wrp->usb_bitmap);
>         musb_writel(reg_base, wrp->epintr_clear,
>                          wrp->txep_bitmap | wrp->rxep_bitmap);
> -       del_timer_sync(&glue->timer);
> +       del_timer_sync(&musb->dev_timer);
>  }
>
>  /* Caller must take musb->lock */
> @@ -230,7 +230,7 @@ static int dsps_check_status(struct musb *musb, void *unused)
>         int skip_session = 0;
>
>         if (glue->vbus_irq)
> -               del_timer(&glue->timer);
> +               del_timer(&musb->dev_timer);
>
>         /*
>          * We poll because DSPS IP's won't expose several OTG-critical
> @@ -284,8 +284,7 @@ static int dsps_check_status(struct musb *musb, void *unused)
>
>  static void otg_timer(struct timer_list *t)
>  {
> -       struct dsps_glue *glue = from_timer(glue, t, timer);
> -       struct musb *musb = platform_get_drvdata(glue->musb);
> +       struct musb *musb = from_timer(musb, t, dev_timer);
>         struct device *dev = musb->controller;
>         unsigned long flags;
>         int err;
> @@ -481,7 +480,7 @@ static int dsps_musb_init(struct musb *musb)
>                 }
>         }
>
> -       timer_setup(&glue->timer, otg_timer, 0);
> +       timer_setup(&musb->dev_timer, otg_timer, 0);
>
>         /* Reset the musb */
>         musb_writel(reg_base, wrp->control, (1 << wrp->reset));
> @@ -516,7 +515,7 @@ static int dsps_musb_exit(struct musb *musb)
>         struct device *dev = musb->controller;
>         struct dsps_glue *glue = dev_get_drvdata(dev->parent);
>
> -       del_timer_sync(&glue->timer);
> +       del_timer_sync(&musb->dev_timer);
>         usb_phy_shutdown(musb->xceiv);
>         phy_power_off(musb->phy);
>         phy_exit(musb->phy);
> @@ -1028,7 +1027,7 @@ static int dsps_suspend(struct device *dev)
>                 return ret;
>         }
>
> -       del_timer_sync(&glue->timer);
> +       del_timer_sync(&musb->dev_timer);
>
>         mbase = musb->ctrl_base;
>         glue->context.control = musb_readl(mbase, wrp->control);
> --
> 1.9.1
>



-- 
Kees Cook
Pixel Security