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authorAndrew Lunn <andrew@lunn.ch>2017-12-07 01:05:56 +0100
committerDavid S. Miller <davem@davemloft.net>2017-12-07 13:53:05 -0500
commit3d5fdba1842bdd2eef29364c660558cb4cbb3fe0 (patch)
tree1577dbd507c39c90a678ea3006178c0b00df1430
parente46772a6946a7d1f3fbbc1415871851d6651f1d4 (diff)
downloadlinux-3d5fdba1842bdd2eef29364c660558cb4cbb3fe0.tar.bz2
net: dsa: mv88e6xxx: Fix interrupt masking on removal
When removing the interrupt handling code, we should mask the generation of interrupts. The code however unmasked all interrupts. This can then cause a new interrupt. We then get into a deadlock where the interrupt thread is waiting to run, and the code continues, trying to remove the interrupt handler, which means waiting for the thread to complete. On a UP machine this deadlocks. Fix so we really mask interrupts in the hardware. The same error is made in the error path when install the interrupt handling code. Fixes: 3460a5770ce9 ("net: dsa: mv88e6xxx: Mask g1 interrupts and free interrupt") Signed-off-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/dsa/mv88e6xxx/chip.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 8171055fde7a..70004264f60d 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -339,7 +339,7 @@ static void mv88e6xxx_g1_irq_free(struct mv88e6xxx_chip *chip)
u16 mask;
mv88e6xxx_g1_read(chip, MV88E6XXX_G1_CTL1, &mask);
- mask |= GENMASK(chip->g1_irq.nirqs, 0);
+ mask &= ~GENMASK(chip->g1_irq.nirqs, 0);
mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL1, mask);
free_irq(chip->irq, chip);
@@ -395,7 +395,7 @@ static int mv88e6xxx_g1_irq_setup(struct mv88e6xxx_chip *chip)
return 0;
out_disable:
- mask |= GENMASK(chip->g1_irq.nirqs, 0);
+ mask &= ~GENMASK(chip->g1_irq.nirqs, 0);
mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL1, mask);
out_mapping: