5.15-stable review patch. If anyone has any objections, please let me know.

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From: Jonas Gorski jonas.gorski@gmail.com

[ Upstream commit 0be04b5fa62a82a9929ca261f6c9f64a3d0a28da ]

The switch clears the ARL_SRCH_STDN bit when the search is done, i.e. it finished traversing the ARL table.

This means that there will be no valid result, so we should not attempt to read and process any further entries.

We only ever check the validity of the entries for 4 ARL bin chips, and only after having passed the first entry to the b53_fdb_copy().

This means that we always pass an invalid entry at the end to the b53_fdb_copy(). b53_fdb_copy() does check the validity though before passing on the entry, so it never gets passed on.

On < 4 ARL bin chips, we will even continue reading invalid entries until we reach the result limit.

Fixes: 1da6df85c6fb ("net: dsa: b53: Implement ARL add/del/dump operations") Signed-off-by: Jonas Gorski jonas.gorski@gmail.com Reviewed-by: Florian Fainelli florian.fainelli@broadcom.com Link: https://patch.msgid.link/20251102100758.28352-3-jonas.gorski@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/dsa/b53/b53_common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c index 228b470d13a0f..d5ed733c0c979 100644 --- a/drivers/net/dsa/b53/b53_common.c +++ b/drivers/net/dsa/b53/b53_common.c @@ -1802,7 +1802,7 @@ static int b53_arl_search_wait(struct b53_device *dev) do { b53_read8(dev, B53_ARLIO_PAGE, B53_ARL_SRCH_CTL, &reg); if (!(reg & ARL_SRCH_STDN)) - return 0; + return -ENOENT;

if (reg & ARL_SRCH_VLID) return 0;