From: Dan Carpenter <dan.carpenter@linaro.org>
Date: Tue, 26 Sep 2023 14:05:59 +0000 (+0300)
Subject: net: ti: icssg-prueth: Fix signedness bug in prueth_init_tx_chns()
X-Git-Tag: v6.6.17~3804^2~19
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a325f174d70828f62872847b703206566dcdb64c;p=platform%2Fkernel%2Flinux-rpi.git

net: ti: icssg-prueth: Fix signedness bug in prueth_init_tx_chns()

The "tx_chn->irq" variable is unsigned so the error checking does not
work correctly.

Fixes: 128d5874c082 ("net: ti: icssg-prueth: Add ICSSG ethernet driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
index 410612f..e3dcb08 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
@@ -316,12 +316,14 @@ static int prueth_init_tx_chns(struct prueth_emac *emac)
 			goto fail;
 		}
 
-		tx_chn->irq = k3_udma_glue_tx_get_irq(tx_chn->tx_chn);
-		if (tx_chn->irq <= 0) {
-			ret = -EINVAL;
+		ret = k3_udma_glue_tx_get_irq(tx_chn->tx_chn);
+		if (ret <= 0) {
+			if (!ret)
+				ret = -EINVAL;
 			netdev_err(ndev, "failed to get tx irq\n");
 			goto fail;
 		}
+		tx_chn->irq = ret;
 
 		snprintf(tx_chn->name, sizeof(tx_chn->name), "%s-tx%d",
 			 dev_name(dev), tx_chn->id);