[PATCH net 1/2] net/stmmac: Protect against zero queue DTS config

[Jakub Raczynski <j.raczynski@samsung.com>]

Commit 8a7bca6de6de protected against inputing number of tx/rx_queues_to_use
over kernel supported limit in DTS config. AI review mentioned that we also
should protect against zero queue input, because this would cause issues
down the line. Missing config is not an issue as stmmac_plat_dat_alloc()
does apply '1' by default.

Fix this by adding check for zero queues input during DTS parsing

Fixes: 8a7bca6de6de ("net/stmmac: Apply MTL_MAX queue limit if config missing")
Reported-by: Sashiko AI <sashiko-bot@kernel.org>
Signed-off-by: Jakub Raczynski <j.raczynski@samsung.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index dc5f951a311d..9112cd69b9b1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -158,6 +158,8 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 	if (!of_property_read_u32(rx_node, "snps,rx-queues-to-use", &value)) {
 		if (value > MTL_MAX_RX_QUEUES)
 			value = MTL_MAX_RX_QUEUES;
+		else if (value == 0)
+			value = 1;
 		plat->rx_queues_to_use = value;
 	}
 
@@ -212,6 +214,8 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 	if (!of_property_read_u32(tx_node, "snps,tx-queues-to-use", &value)) {
 		if (value > MTL_MAX_TX_QUEUES)
 			value = MTL_MAX_TX_QUEUES;
+		else if (value == 0)
+			value = 1;
 		plat->tx_queues_to_use = value;
 	}
 
-- 
2.34.1