linux-kernel - Re: [PATCH] misc: genwqe: should return proper error value.

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Date:   Mon, 12 Nov 2018 12:28:12 +0100
From:   haver <haver@...ux.vnet.ibm.com>
To:     zhong jiang <zhongjiang@...wei.com>
Cc:     gregkh@...uxfoundation.org, gpiccoli@...ux.vnet.ibm.com,
        arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] misc: genwqe: should return proper error value.

On 2018-09-20 04:29, zhong jiang wrote:
> The function should return -EFAULT when copy_from_user fails. Even
> though the caller does not distinguish them. but we should keep 
> backward
> compatibility.
> 
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  drivers/misc/genwqe/card_utils.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/misc/genwqe/card_utils.c 
> b/drivers/misc/genwqe/card_utils.c
> index 8679e0b..f0961ec 100644
> --- a/drivers/misc/genwqe/card_utils.c
> +++ b/drivers/misc/genwqe/card_utils.c
> @@ -298,7 +298,7 @@ static int genwqe_sgl_size(int num_pages)
>  int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl 
> *sgl,
>  			  void __user *user_addr, size_t user_size, int write)
>  {
> -	int rc;
> +	int ret = -ENOMEM;
>  	struct pci_dev *pci_dev = cd->pci_dev;
> 
>  	sgl->fpage_offs = offset_in_page((unsigned long)user_addr);
> @@ -318,7 +318,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd,
> struct genwqe_sgl *sgl,
>  	if (get_order(sgl->sgl_size) > MAX_ORDER) {
>  		dev_err(&pci_dev->dev,
>  			"[%s] err: too much memory requested!\n", __func__);
> -		return -ENOMEM;
> +		return ret;
>  	}
> 
>  	sgl->sgl = __genwqe_alloc_consistent(cd, sgl->sgl_size,
> @@ -326,7 +326,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd,
> struct genwqe_sgl *sgl,
>  	if (sgl->sgl == NULL) {
>  		dev_err(&pci_dev->dev,
>  			"[%s] err: no memory available!\n", __func__);
> -		return -ENOMEM;
> +		return ret;
>  	}
> 
>  	/* Only use buffering on incomplete pages */
> @@ -339,7 +339,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd,
> struct genwqe_sgl *sgl,
>  		/* Sync with user memory */
>  		if (copy_from_user(sgl->fpage + sgl->fpage_offs,
>  				   user_addr, sgl->fpage_size)) {
> -			rc = -EFAULT;
> +			ret = -EFAULT;
>  			goto err_out;
>  		}
>  	}
> @@ -352,7 +352,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd,
> struct genwqe_sgl *sgl,
>  		/* Sync with user memory */
>  		if (copy_from_user(sgl->lpage, user_addr + user_size -
>  				   sgl->lpage_size, sgl->lpage_size)) {
> -			rc = -EFAULT;
> +			ret = -EFAULT;
>  			goto err_out2;
>  		}
>  	}
> @@ -374,7 +374,8 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd,
> struct genwqe_sgl *sgl,
>  	sgl->sgl = NULL;
>  	sgl->sgl_dma_addr = 0;
>  	sgl->sgl_size = 0;
> -	return -ENOMEM;
> +
> +	return ret;
>  }
> 
>  int genwqe_setup_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,

Thanks for the contribution. Should be fine to change that and have
a more precise failure information.

Signed-off-by: Frank Haverkamp <haver@...ux.vnet.ibm.com>