linux-kernel - [PATCH] media: atomisp: Remove unneeded null check

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Message-Id: <20211110094910.67951-1-vulab@iscas.ac.cn>
Date:   Wed, 10 Nov 2021 09:49:10 +0000
From:   Xu Wang <vulab@...as.ac.cn>
To:     mchehab@...nel.org, sakari.ailus@...ux.intel.com,
        gregkh@...uxfoundation.org
Cc:     linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH] media: atomisp: Remove unneeded null check

In ia_css_frame_map, the check of 'err' is unneeded to be done twice.

Signed-off-by: Xu Wang <vulab@...as.ac.cn>
---
 .../atomisp/pci/runtime/frame/src/frame.c     | 32 +++++++++----------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/runtime/frame/src/frame.c b/drivers/staging/media/atomisp/pci/runtime/frame/src/frame.c
index 10c4907187d9..529decf3f57f 100644
--- a/drivers/staging/media/atomisp/pci/runtime/frame/src/frame.c
+++ b/drivers/staging/media/atomisp/pci/runtime/frame/src/frame.c
@@ -168,25 +168,23 @@ int ia_css_frame_map(struct ia_css_frame **frame,
 	if (err)
 		return err;
 
-	if (!err) {
-		if (pgnr < ((PAGE_ALIGN(me->data_bytes)) >> PAGE_SHIFT)) {
-			dev_err(atomisp_dev,
-				"user space memory size is less than the expected size..\n");
-			err = -ENOMEM;
-			goto error;
-		} else if (pgnr > ((PAGE_ALIGN(me->data_bytes)) >> PAGE_SHIFT)) {
-			dev_err(atomisp_dev,
-				"user space memory size is large than the expected size..\n");
-			err = -ENOMEM;
-			goto error;
-		}
+	if (pgnr < ((PAGE_ALIGN(me->data_bytes)) >> PAGE_SHIFT)) {
+		dev_err(atomisp_dev,
+			"user space memory size is less than the expected size..\n");
+		err = -ENOMEM;
+		goto error;
+	} else if (pgnr > ((PAGE_ALIGN(me->data_bytes)) >> PAGE_SHIFT)) {
+		dev_err(atomisp_dev,
+			"user space memory size is large than the expected size..\n");
+		err = -ENOMEM;
+		goto error;
+	}
 
-		me->data = hmm_alloc(me->data_bytes, HMM_BO_USER, 0, data,
-				     attribute & ATOMISP_MAP_FLAG_CACHED);
+	me->data = hmm_alloc(me->data_bytes, HMM_BO_USER, 0, data,
+			     attribute & ATOMISP_MAP_FLAG_CACHED);
 
-		if (me->data == mmgr_NULL)
-			err = -EINVAL;
-	}
+	if (me->data == mmgr_NULL)
+		err = -EINVAL;
 
 error:
 	if (err) {
-- 
2.25.1