linux-kernel - [PATCH] net/atm: use list_is_singular() in br2684

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Date:   Tue, 27 Oct 2020 00:57:00 +0800
From:   Hui Su <sh_def@....com>
To:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net/atm: use list_is_singular() in br2684_setfilt()

list_is_singular() can tell whether a list has just one entry.
So we use list_is_singular（) here.

Signed-off-by: Hui Su <sh_def@....com>
---
 net/atm/br2684.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index 3e17a5ecaa94..398f7e086cf4 100644
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -372,8 +372,7 @@ static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
 		struct br2684_dev *brdev;
 		read_lock(&devs_lock);
 		brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
-		if (brdev == NULL || list_empty(&brdev->brvccs) ||
-		    brdev->brvccs.next != brdev->brvccs.prev)	/* >1 VCC */
+		if (brdev == NULL || !list_is_singular(&brdev->brvccs))	/* >1 VCC */
 			brvcc = NULL;
 		else
 			brvcc = list_entry_brvcc(brdev->brvccs.next);
-- 
2.25.1