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Subject[PATCH 12/24] Staging: ipack/bridges/tpci200: Clean up interrupt handling.
Date
From: Jens Taprogge <jens.taprogge@taprogge.org>

Previously the return value from tpci200_interrupt was not quite correct
if a slot had caused an interrupt but no handler was instellalled:
IRQ_NONE was returned. However in this case we react to the interrupt
by disabling the IPack device interrupt.

Basically there are two cases the code now distinguishes:
- The tpci200 has raised an interrupt. We handle it and return
IRQ_HANDLED.
- Our device did not raise an interrupt. We return IRQ_NONE.

Signed-off-by: Jens Taprogge <jens.taprogge@taprogge.org>
Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
---
drivers/staging/ipack/bridges/tpci200.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/ipack/bridges/tpci200.c b/drivers/staging/ipack/bridges/tpci200.c
index b1ddbe3..0cbaf3a 100644
--- a/drivers/staging/ipack/bridges/tpci200.c
+++ b/drivers/staging/ipack/bridges/tpci200.c
@@ -116,7 +116,6 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
struct tpci200_board *tpci200 = (struct tpci200_board *) dev_id;
int i;
unsigned short status_reg;
- irqreturn_t ret = IRQ_NONE;
struct slot_irq *slot_irq;

/* Read status register */
@@ -130,7 +129,7 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
continue;
slot_irq = rcu_dereference(tpci200->slots[i].irq);
if (slot_irq) {
- ret = tpci200_slot_irq(slot_irq);
+ tpci200_slot_irq(slot_irq);
} else {
dev_info(&tpci200->info->pdev->dev,
"No registered ISR for slot [%d:%d]!. IRQ will be disabled.\n",
@@ -141,9 +140,11 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
}
}
rcu_read_unlock();
- }

- return ret;
+ return IRQ_HANDLED;
+ } else {
+ return IRQ_NONE;
+ }
}

static int tpci200_register(struct tpci200_board *tpci200)
--
1.7.10.4


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