From: Hayes Wang <hayeswang@realtek.com>
Date: Fri, 8 Sep 2023 07:01:52 +0000 (+0800)
Subject: r8152: check budget for r8152_poll()
X-Git-Tag: v5.15.132~13
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=864da4a5d5eb6800aadaaef5cb174bd28d7f97ea;p=thirdparty%2Fkernel%2Fstable.git

r8152: check budget for r8152_poll()

[ Upstream commit a7b8d60b37237680009dd0b025fe8c067aba0ee3 ]

According to the document of napi, there is no rx process when the
budget is 0. Therefore, r8152_poll() has to return 0 directly when the
budget is equal to 0.

Fixes: d2187f8e4454 ("r8152: divide the tx and rx bottom functions")
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 579524cb5d9b2..4cd9bcca84c5b 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -2625,6 +2625,9 @@ static int r8152_poll(struct napi_struct *napi, int budget)
 	struct r8152 *tp = container_of(napi, struct r8152, napi);
 	int work_done;
 
+	if (!budget)
+		return 0;
+
 	work_done = rx_bottom(tp, budget);
 
 	if (work_done < budget) {