linux-kernel - [PATCH] rewrite isd200_init

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Date:	Fri, 28 Aug 2015 09:31:43 -0400
From:	Kris Borer <kborer@...il.com>
To:	mdharm-usb@...-eyed-alien.net
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org,
	Kris Borer <kborer@...il.com>
Subject: [PATCH] rewrite isd200_init_info for readability

Previously, Coccinelle would issue the following false positive:

isd200.c:1478:14-18: ERROR: reference preceded by free on line 1472

This change rewrites the isd200_init_info function to have more explicit
execution pathways to make it easier for scripts and humans to parse.

Signed-off-by: Kris Borer <kborer@...il.com>
---
 drivers/usb/storage/isd200.c | 30 +++++++++++++-----------------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/storage/isd200.c b/drivers/usb/storage/isd200.c
index 1bac215..39afd70 100644
--- a/drivers/usb/storage/isd200.c
+++ b/drivers/usb/storage/isd200.c
@@ -1456,30 +1456,26 @@ static void isd200_free_info_ptrs(void *info_)
  */
 static int isd200_init_info(struct us_data *us)
 {
-	int retStatus = ISD200_GOOD;
 	struct isd200_info *info;
 
 	info = kzalloc(sizeof(struct isd200_info), GFP_KERNEL);
 	if (!info)
-		retStatus = ISD200_ERROR;
-	else {
-		info->id = kzalloc(ATA_ID_WORDS * 2, GFP_KERNEL);
-		info->RegsBuf = kmalloc(sizeof(info->ATARegs), GFP_KERNEL);
-		info->srb.sense_buffer =
-				kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
-		if (!info->id || !info->RegsBuf || !info->srb.sense_buffer) {
-			isd200_free_info_ptrs(info);
-			kfree(info);
-			retStatus = ISD200_ERROR;
-		}
-	}
+		return ISD200_ERROR;
 
-	if (retStatus == ISD200_GOOD) {
-		us->extra = info;
-		us->extra_destructor = isd200_free_info_ptrs;
+	info->id = kzalloc(ATA_ID_WORDS * 2, GFP_KERNEL);
+	info->RegsBuf = kmalloc(sizeof(info->ATARegs), GFP_KERNEL);
+	info->srb.sense_buffer = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
+
+	if (!info->id || !info->RegsBuf || !info->srb.sense_buffer) {
+		isd200_free_info_ptrs(info);
+		kfree(info);
+		return ISD200_ERROR;
 	}
 
-	return retStatus;
+	us->extra = info;
+	us->extra_destructor = isd200_free_info_ptrs;
+
+	return ISD200_GOOD;
 }
 
 /**************************************************************************
-- 
1.9.1

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