* [PATCH] misc: genwqe: should return proper error value.
@ 2018-09-20 2:29 zhong jiang
2018-11-12 11:28 ` haver
0 siblings, 1 reply; 2+ messages in thread
From: zhong jiang @ 2018-09-20 2:29 UTC (permalink / raw)
To: gregkh; +Cc: gpiccoli, haver, arnd, linux-kernel
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@huawei.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,
--
1.7.12.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] misc: genwqe: should return proper error value.
2018-09-20 2:29 [PATCH] misc: genwqe: should return proper error value zhong jiang
@ 2018-11-12 11:28 ` haver
0 siblings, 0 replies; 2+ messages in thread
From: haver @ 2018-11-12 11:28 UTC (permalink / raw)
To: zhong jiang; +Cc: gregkh, gpiccoli, arnd, linux-kernel
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@huawei.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@linux.vnet.ibm.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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