linux-kernel - [PATCH v3 -next] binder: simplify the return expression of binder

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Message-ID: <20200929015216.1829946-1-liushixin2@huawei.com>
Date:   Tue, 29 Sep 2020 09:52:16 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Christian Brauner <christian@...uner.io>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Hridya Valsaraju <hridya@...gle.com>,
        "Suren Baghdasaryan" <surenb@...gle.com>,
        <devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
        Liu Shixin <liushixin2@...wei.com>
Subject: [PATCH v3 -next] binder: simplify the return expression of binder_mmap

Simplify the return expression.

Signed-off-by: Liu Shixin <liushixin2@...wei.com>
---
v3: Add the change description.
v2: Get rid of the "ret" and "failure string" variables.
v1: Simplify the return expression.
---
 drivers/android/binder.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 37a505c41dec..49c0700816a5 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -5180,9 +5180,7 @@ static const struct vm_operations_struct binder_vm_ops = {
 
 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	int ret;
 	struct binder_proc *proc = filp->private_data;
-	const char *failure_string;
 
 	if (proc->tsk != current->group_leader)
 		return -EINVAL;
@@ -5194,9 +5192,9 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
 		     (unsigned long)pgprot_val(vma->vm_page_prot));
 
 	if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
-		ret = -EPERM;
-		failure_string = "bad vm_flags";
-		goto err_bad_arg;
+		pr_err("%s: %d %lx-%lx %s failed %d\n", __func__,
+		       proc->pid, vma->vm_start, vma->vm_end, "bad vm_flags", -EPERM);
+		return -EPERM;
 	}
 	vma->vm_flags |= VM_DONTCOPY | VM_MIXEDMAP;
 	vma->vm_flags &= ~VM_MAYWRITE;
@@ -5204,15 +5202,7 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
 	vma->vm_ops = &binder_vm_ops;
 	vma->vm_private_data = proc;
 
-	ret = binder_alloc_mmap_handler(&proc->alloc, vma);
-	if (ret)
-		return ret;
-	return 0;
-
-err_bad_arg:
-	pr_err("%s: %d %lx-%lx %s failed %d\n", __func__,
-	       proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
-	return ret;
+	return binder_alloc_mmap_handler(&proc->alloc, vma);
 }
 
 static int binder_open(struct inode *nodp, struct file *filp)
-- 
2.25.1