6.6-stable review patch. If anyone has any objections, please let me know.
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From: Bastien Curutchet (Schneider Electric) bastien.curutchet@bootlin.com
commit 7b3c09e1667977edee11de94a85e2593a7c15e87 upstream.
irq_find_mapping() returns a positive IRQ number or 0 if no IRQ is found but it never returns a negative value. However, on each irq_find_mapping() call, we verify that the returned value isn't negative.
Fix the irq_find_mapping() checks to enter error paths when 0 is returned. Return -EINVAL in such cases.
CC: stable@vger.kernel.org Fixes: c9cd961c0d43 ("net: dsa: microchip: lan937x: add interrupt support for port phy link") Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: Bastien Curutchet (Schneider Electric) bastien.curutchet@bootlin.com Link: https://patch.msgid.link/20251120-ksz-fix-v6-1-891f80ae7f8f@bootlin.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/dsa/microchip/ksz_common.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/net/dsa/microchip/ksz_common.c +++ b/drivers/net/dsa/microchip/ksz_common.c @@ -1870,8 +1870,8 @@ static int ksz_irq_phy_setup(struct ksz_ if (BIT(phy) & ds->phys_mii_mask) { irq = irq_find_mapping(dev->ports[phy].pirq.domain, PORT_SRC_PHY_INT); - if (irq < 0) { - ret = irq; + if (!irq) { + ret = -EINVAL; goto out; } ds->slave_mii_bus->irq[phy] = irq; @@ -2095,8 +2095,8 @@ static int ksz_pirq_setup(struct ksz_dev snprintf(pirq->name, sizeof(pirq->name), "port_irq-%d", p);
pirq->irq_num = irq_find_mapping(dev->girq.domain, p); - if (pirq->irq_num < 0) - return pirq->irq_num; + if (!pirq->irq_num) + return -EINVAL;
return ksz_irq_common_setup(dev, pirq); }