net: dsa: microchip: Free previously initialized ports on init failures

If a port interrupt setup fails after at least one port has already been
successfully initialized, the gotos miss some resource releasing:
- the already initialized PTP IRQs aren't released
- the already initialized port IRQs aren't released if the failure
occurs in ksz_pirq_setup().

Merge 'out_girq' and 'out_ptpirq' into a single 'port_release' label.
Behind this label, use the reverse loop to release all IRQ resources
for all initialized ports.
Jump in the middle of the reverse loop if an error occurs in
ksz_ptp_irq_setup() to only release the port IRQ of the current
iteration.

Cc: stable@vger.kernel.org
Fixes: c9cd961c0d43 ("net: dsa: microchip: lan937x: add interrupt support for port phy link")
Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@bootlin.com>
Link: https://patch.msgid.link/20251120-ksz-fix-v6-4-891f80ae7f8f@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index a927055423f3bcbe29508b32cf10f1a0704c5938..0c10351fe5eb4206210c727ffc2484bfb7168d97 100644 (file)
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -3038,12 +3038,12 @@ static int ksz_setup(struct dsa_switch *ds)
                dsa_switch_for_each_user_port(dp, dev->ds) {
                        ret = ksz_pirq_setup(dev, dp->index);
                        if (ret)
-                               goto out_girq;
+                               goto port_release;
 
                        if (dev->info->ptp_capable) {
                                ret = ksz_ptp_irq_setup(ds, dp->index);
                                if (ret)
-                                       goto out_pirq;
+                                       goto pirq_release;
                        }
                }
        }
@@ -3053,7 +3053,7 @@ static int ksz_setup(struct dsa_switch *ds)
                if (ret) {
                        dev_err(dev->dev, "Failed to register PTP clock: %d\n",
                                ret);
-                       goto out_ptpirq;
+                       goto port_release;
                }
        }
 
@@ -3076,17 +3076,16 @@ static int ksz_setup(struct dsa_switch *ds)
 out_ptp_clock_unregister:
        if (dev->info->ptp_capable)
                ksz_ptp_clock_unregister(ds);
-out_ptpirq:
-       if (dev->irq > 0 && dev->info->ptp_capable)
-               dsa_switch_for_each_user_port(dp, dev->ds)
-                       ksz_ptp_irq_free(ds, dp->index);
-out_pirq:
-       if (dev->irq > 0)
-               dsa_switch_for_each_user_port_continue_reverse(dp, dev->ds)
+port_release:
+       if (dev->irq > 0) {
+               dsa_switch_for_each_user_port_continue_reverse(dp, dev->ds) {
+                       if (dev->info->ptp_capable)
+                               ksz_ptp_irq_free(ds, dp->index);
+pirq_release:
                        ksz_irq_free(&dev->ports[dp->index].pirq);
-out_girq:
-       if (dev->irq > 0)
+               }
                ksz_irq_free(&dev->girq);
+       }
 
        return ret;
 }