linux-kernel - Re: [PATCH] usb: musb: Fix external abort in musb

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Date:   Thu, 8 Mar 2018 15:15:25 -0600
From:   Bin Liu <b-liu@...com>
To:     Merlijn Wajer <merlijn@...zup.org>
CC:     <ivo.g.dimitrov.75@...il.com>, <linux-omap@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: musb: Fix external abort in musb_remove

Hi,

please add patch version numbers in the subject when necessary. This
helps cross-referencing.

On Thu, Mar 08, 2018 at 09:40:47PM +0100, Merlijn Wajer wrote:
> This fixes an oops on unbind / module unload.
> 
> musb_remove function now calls musb_platform_exit before disabling
> runtime pm.
> 
> Signed-off-by: Merlijn Wajer <merlijn@...zup.org>
> ---
>  drivers/usb/musb/musb_core.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index e2e95071328a..cf90d34f7199 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -2472,13 +2472,14 @@ static int musb_remove(struct platform_device *pdev)
>  	musb_platform_disable(musb);
>  	spin_lock_irqsave(&musb->lock, flags);
>  	musb_disable_interrupts(musb);
> -	musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
>  	spin_unlock_irqrestore(&musb->lock, flags);
>  
> +	musb_writeb(musb->mregs, MUSB_DEVCTL, 0);

Does it solve the issue if not moving this line? I'd like to have
minimum change if possible.

> +	musb_platform_exit(musb);
> +
>  	pm_runtime_dont_use_autosuspend(musb->controller);
>  	pm_runtime_put_sync(musb->controller);
>  	pm_runtime_disable(musb->controller);
> -	musb_platform_exit(musb);
>  	musb_phy_callback = NULL;
>  	if (musb->dma_controller)
>  		musb_dma_controller_destroy(musb->dma_controller);

Regards,
-Bin.