linux-kernel - Re: [PATCH] uacce: remove uacce_vma

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Date:   Wed, 17 Jun 2020 11:32:17 +0200
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Zhangfei Gao <zhangfei.gao@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        kenneth-lee-2012@...mail.com, Wangzhou <wangzhou1@...ilicon.com>,
        linux-accelerators@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] uacce: remove uacce_vma_fault

On Mon, Jun 15, 2020 at 09:55:57PM +0800, Zhangfei Gao wrote:
> Fix NULL pointer error if removing uacce's parent module during app's
> running. SIGBUS is already reported by do_page_fault, so uacce_vma_fault
> is not needed. If providing vma_fault, vmf->page has to be filled as well,
> required by __do_fault.
> 
> Reported-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
> Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>

Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>

> ---
>  drivers/misc/uacce/uacce.c | 9 ---------
>  1 file changed, 9 deletions(-)
> 
> diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c
> index 107028e..aa91f69 100644
> --- a/drivers/misc/uacce/uacce.c
> +++ b/drivers/misc/uacce/uacce.c
> @@ -179,14 +179,6 @@ static int uacce_fops_release(struct inode *inode, struct file *filep)
>  	return 0;
>  }
>  
> -static vm_fault_t uacce_vma_fault(struct vm_fault *vmf)
> -{
> -	if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
> -		return VM_FAULT_SIGBUS;
> -
> -	return 0;
> -}
> -
>  static void uacce_vma_close(struct vm_area_struct *vma)
>  {
>  	struct uacce_queue *q = vma->vm_private_data;
> @@ -199,7 +191,6 @@ static void uacce_vma_close(struct vm_area_struct *vma)
>  }
>  
>  static const struct vm_operations_struct uacce_vm_ops = {
> -	.fault = uacce_vma_fault,
>  	.close = uacce_vma_close,
>  };
>  
> -- 
> 2.7.4
>