[PATCH net-next] net: ethernet: mediatek: ppe: fix busy wait loop

[Ilya Lipnitskiy]

The intention is for the loop to timeout if the body does not succeed.
The current logic calls time_is_before_jiffies(timeout) which is false
until after the timeout, so the loop body never executes.

time_is_after_jiffies(timeout) will return true until timeout is less
than jiffies, which is the intended behavior here.

Fixes: ba37b7caf1ed ("net: ethernet: mtk_eth_soc: add support for initializing the PPE")
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@xxxxxxxxx>
Cc: Felix Fietkau <nbd@xxxxxxxx>
---
 drivers/net/ethernet/mediatek/mtk_ppe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c
index 71e1ccea6e72..af3c266297aa 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
@@ -46,7 +46,7 @@ static int mtk_ppe_wait_busy(struct mtk_ppe *ppe)
 {
 	unsigned long timeout = jiffies + HZ;
 
-	while (time_is_before_jiffies(timeout)) {
+	while (time_is_after_jiffies(timeout)) {
 		if (!(ppe_r32(ppe, MTK_PPE_GLO_CFG) & MTK_PPE_GLO_CFG_BUSY))
 			return 0;
 
-- 
2.31.1