linux-kernel - [PATCH 1/4 V2] VMCI: Remove redundant error check and code cleanup

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Date:	Sat, 17 May 2014 23:20:19 +0200
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Senna Tschudin <peter.senna@...il.com>,
	kernel-janitors@...r.kernel.org, dan.carpenter@...cle.com
Subject: [PATCH 1/4 V2] VMCI: Remove redundant error check and code cleanup

Remove double checks, and move the call to pr_devel. Remove the
initialization of the result variable, and return VMCI_SUCCESS on
success. Fix the condition of the for loop. Replace break with a
return. The simplified version of the coccinelle semantic patch
that find the redundant check issue is as follows:

// <smpl>
@@
expression E; identifier pr; expression list es;
@@
for(...;...;...){
...
-	if (E) break;
+	if (E){
+		pr(es);
+		break;
+	}
...
}
- if(E) pr(es);
// </smpl>

Tested by compilation only.

Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>

---
Changes from V1:
 - Removed initialization of result
 - Return VMCI_SUCCESS instead of result on success
 - Fixed the for loop condition
 - Replaced break with a return

 drivers/misc/vmw_vmci/vmci_context.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/vmw_vmci/vmci_context.c b/drivers/misc/vmw_vmci/vmci_context.c
index f866a4b..78c1165 100644
--- a/drivers/misc/vmw_vmci/vmci_context.c
+++ b/drivers/misc/vmw_vmci/vmci_context.c
@@ -816,7 +816,7 @@ int vmci_ctx_set_chkpt_state(u32 context_id,
 {
 	u32 i;
 	u32 current_id;
-	int result = VMCI_SUCCESS;
+	int result;
 	u32 num_ids = buf_size / sizeof(u32);
 
 	if (cpt_type == VMCI_WELLKNOWN_CPT_STATE && num_ids > 0) {
@@ -833,17 +833,17 @@ int vmci_ctx_set_chkpt_state(u32 context_id,
 		return VMCI_ERROR_INVALID_ARGS;
 	}
 
-	for (i = 0; i < num_ids && result == VMCI_SUCCESS; i++) {
+	for (i = 0; i < num_ids; i++) {
 		current_id = ((u32 *)cpt_buf)[i];
 		result = vmci_ctx_add_notification(context_id, current_id);
-		if (result != VMCI_SUCCESS)
-			break;
+		if (result != VMCI_SUCCESS) {
+			pr_devel("Failed to set cpt state (type=%d) (error=%d)\n",
+				 cpt_type, result);
+			return result;
+		}
 	}
-	if (result != VMCI_SUCCESS)
-		pr_devel("Failed to set cpt state (type=%d) (error=%d)\n",
-			 cpt_type, result);
 
-	return result;
+	return VMCI_SUCCESS;
 }
 
 /*
--
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