linux-kernel - [PATCH] net: macb: fix the restore of cmp registers

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Message-ID: <20210414112029.86857-1-claudiu.beznea@microchip.com>
Date:   Wed, 14 Apr 2021 14:20:29 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <nicolas.ferre@...rochip.com>, <davem@...emloft.net>,
        <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH] net: macb: fix the restore of cmp registers

Commit a14d273ba159 ("net: macb: restore cmp registers on resume path")
introduces the restore of CMP registers on resume path. In case the IP
doesn't support type 2 screeners (zero on DCFG8 register) the
struct macb::rx_fs_list::list is not initialized and thus the
list_for_each_entry(item, &bp->rx_fs_list.list, list) loop introduced in
commit a14d273ba159 ("net: macb: restore cmp registers on resume path")
will access an uninitialized list leading to crash. Thus, initialize
the struct macb::rx_fs_list::list without taking into account if the
IP supports type 2 screeners or not.

Fixes: a14d273ba159 ("net: macb: restore cmp registers on resume path")
Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index c36722541bc4..0db538d089b1 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -3926,6 +3926,7 @@ static int macb_init(struct platform_device *pdev)
 	reg = gem_readl(bp, DCFG8);
 	bp->max_tuples = min((GEM_BFEXT(SCR2CMP, reg) / 3),
 			GEM_BFEXT(T2SCR, reg));
+	INIT_LIST_HEAD(&bp->rx_fs_list.list);
 	if (bp->max_tuples > 0) {
 		/* also needs one ethtype match to check IPv4 */
 		if (GEM_BFEXT(SCR2ETH, reg) > 0) {
@@ -3938,7 +3939,6 @@ static int macb_init(struct platform_device *pdev)
 			/* Filtering is supported in hw but don't enable it in kernel now */
 			dev->hw_features |= NETIF_F_NTUPLE;
 			/* init Rx flow definitions */
-			INIT_LIST_HEAD(&bp->rx_fs_list.list);
 			bp->rx_fs_list.count = 0;
 			spin_lock_init(&bp->rx_fs_lock);
 		} else
-- 
2.25.1