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counter: 104-quad-8: Fix skipped IRQ lines during events configuration 

[ Upstream commit 2bc54aaa65 ]

IRQ trigger configuration is skipped if it has already been set before;
however, the IRQ line still needs to be OR'd to irq_enabled because
irq_enabled is reset for every events_configure call. This patch moves
the irq_enabled OR operation update to before the irq_trigger check so
that IRQ line enablement is not skipped.

Fixes: c95cc0d957 ("counter: 104-quad-8: Fix persistent enabled events bug")
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/20220815122301.2750-1-william.gray@linaro.org/
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/179eed11eaf225dbd908993b510df0c8f67b1230.1663844776.git.william.gray@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
William Breathitt Gray 2022-09-22 07:20:56 -04:00 committed by Greg Kroah-Hartman
parent 036eeda221
commit a3ed03b3ce
1 changed files with 3 additions and 3 deletions
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6
drivers/counter/104-quad-8.c
View File

@ -449,6 +449,9 @@ static int quad8_events_configure(struct counter_device *counter)
return -EINVAL;
}
/* Enable IRQ line */
irq_enabled |= BIT(event_node->channel);
/* Skip configuration if it is the same as previously set */
if (priv->irq_trigger[event_node->channel] == next_irq_trigger)
continue;
@ -462,9 +465,6 @@ static int quad8_events_configure(struct counter_device *counter)
priv->irq_trigger[event_node->channel] << 3;
iowrite8(QUAD8_CTR_IOR | ior_cfg,
&priv->reg->channel[event_node->channel].control);
/* Enable IRQ line */
irq_enabled |= BIT(event_node->channel);
}
iowrite8(irq_enabled, &priv->reg->index_interrupt);