From: zhong jiang <zhongjiang@huawei.com>
To: <gregkh@linuxfoundation.org>
Cc: <gpiccoli@linux.vnet.ibm.com>, <haver@linux.vnet.ibm.com>,
<arnd@arndb.de>, <linux-kernel@vger.kernel.org>
Subject: [PATCH] misc: genwqe: should return proper error value.
Date: Thu, 20 Sep 2018 10:29:13 +0800 [thread overview]
Message-ID: <1537410553-23836-1-git-send-email-zhongjiang@huawei.com> (raw)
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
next reply other threads:[~2018-09-20 2:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-20 2:29 zhong jiang [this message]
2018-11-12 11:28 ` [PATCH] misc: genwqe: should return proper error value haver
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