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net: dsa: microchip: ptp: Fix checks on irq_find_mapping()

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irq_find_mapping() returns a positive IRQ number or 0 if no IRQ is found
but it never returns a negative value. However, during the PTP IRQ setup,
we verify that its returned value isn't negative.

Fix the irq_find_mapping() check to enter the error path when 0 is
returned. Return -EINVAL in such case.

Cc: stable@vger.kernel.org
Fixes: cc13ab18b2 ("net: dsa: microchip: ptp: enable interrupt for timestamping")
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-v6-2-891f80ae7f8f@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Bastien Curutchet (Schneider Electric)
2025-11-20 10:12:01 +01:00
committed by Paolo Abeni
parent 7b3c09e166
commit 9e059305be
1 changed files with 2 additions and 2 deletions
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4
drivers/net/dsa/microchip/ksz_ptp.c
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@@ -1139,8 +1139,8 @@ int ksz_ptp_irq_setup(struct dsa_switch *ds, u8 p)
irq_create_mapping(ptpirq->domain, irq);
ptpirq->irq_num = irq_find_mapping(port->pirq.domain, PORT_SRC_PTP_INT);
if (ptpirq->irq_num < 0) {
ret = ptpirq->irq_num;
if (!ptpirq->irq_num) {
ret = -EINVAL;
goto out;
}