[PATCH v2] uacce: add print information if not enable sva

[Kai Ye]

Add print information necessary if user not enable sva.

Signed-off-by: Kai Ye <yekai13 at huawei.com>

changes v1->v2:
	use %pe, ERR_PTR(ret) to descriptive error output
---
 drivers/misc/uacce/uacce.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c
index bae18ef0..488eeb2 100644
--- a/drivers/misc/uacce/uacce.c
+++ b/drivers/misc/uacce/uacce.c
@@ -387,15 +387,22 @@ static void uacce_release(struct device *dev)
 
 static unsigned int uacce_enable_sva(struct device *parent, unsigned int flags)
 {
+	int ret;
+
 	if (!(flags & UACCE_DEV_SVA))
 		return flags;
 
 	flags &= ~UACCE_DEV_SVA;
 
-	if (iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_IOPF))
+	ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_IOPF);
+	if (ret) {
+		dev_err(parent, "failed to enable IOPF feature! ret = %pe\n", ERR_PTR(ret));
 		return flags;
+	}
 
-	if (iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA)) {
+	ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA);
+	if (ret) {
+		dev_err(parent, "failed to enable SVA feature! ret = %pe\n", ERR_PTR(ret));
 		iommu_dev_disable_feature(parent, IOMMU_DEV_FEAT_IOPF);
 		return flags;
 	}
-- 
2.7.4