[PATCH v2 net-next 4/6] net: dsa: mv88e6xxx: Fix cleanup on error for g1 interrupt setup

[Andrew Lunn]

On error, remask the interrupts, release all maps, and remove the
domain. This cannot be done using the mv88e6xxx_g1_irq_free() because
some of these actions are not idempotent.

Signed-off-by: Andrew Lunn <and...@lunn.ch>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 8fcef7e0d3ba..614b2f68d401 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -431,8 +431,8 @@ static void mv88e6xxx_g1_irq_free(struct mv88e6xxx_chip 
*chip)
 
 static int mv88e6xxx_g1_irq_setup(struct mv88e6xxx_chip *chip)
 {
-       int err, irq;
-       u16 reg;
+       int err, irq, virq;
+       u16 reg, mask;
 
        chip->g1_irq.nirqs = chip->info->g1_irqs;
        chip->g1_irq.domain = irq_domain_add_simple(
@@ -447,32 +447,41 @@ static int mv88e6xxx_g1_irq_setup(struct mv88e6xxx_chip 
*chip)
        chip->g1_irq.chip = mv88e6xxx_g1_irq_chip;
        chip->g1_irq.masked = ~0;
 
-       err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &reg);
+       err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &mask);
        if (err)
-               goto out;
+               goto out_mapping;
 
-       reg &= ~GENMASK(chip->g1_irq.nirqs, 0);
+       mask &= ~GENMASK(chip->g1_irq.nirqs, 0);
 
-       err = mv88e6xxx_g1_write(chip, GLOBAL_CONTROL, reg);
+       err = mv88e6xxx_g1_write(chip, GLOBAL_CONTROL, mask);
        if (err)
-               goto out;
+               goto out_disable;
 
        /* Reading the interrupt status clears (most of) them */
        err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &reg);
        if (err)
-               goto out;
+               goto out_disable;
 
        err = request_threaded_irq(chip->irq, NULL,
                                   mv88e6xxx_g1_irq_thread_fn,
                                   IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
                                   dev_name(chip->dev), chip);
        if (err)
-               goto out;
+               goto out_disable;
 
        return 0;
 
-out:
-       mv88e6xxx_g1_irq_free(chip);
+out_disable:
+       mask |= GENMASK(chip->g1_irq.nirqs, 0);
+       mv88e6xxx_g1_write(chip, GLOBAL_CONTROL, mask);
+
+out_mapping:
+       for (irq = 0; irq < 16; irq++) {
+               virq = irq_find_mapping(chip->g1_irq.domain, irq);
+               irq_dispose_mapping(virq);
+       }
+
+       irq_domain_remove(chip->g1_irq.domain);
 
        return err;
 }
-- 
2.10.2