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Subject[tip: irq/core] irqchip/gic-v3-its: Remove the redundant set_bit for lpi_map
The following commit has been merged into the irq/core branch of tip:

Commit-ID: 342be1068d9b5b1fd364d270b4f731764e23de2b
Gitweb: https://git.kernel.org/tip/342be1068d9b5b1fd364d270b4f731764e23de2b
Author: Zenghui Yu <yuzenghui@huawei.com>
AuthorDate: Sat, 27 Jul 2019 06:14:22
Committer: Marc Zyngier <maz@kernel.org>
CommitterDate: Tue, 20 Aug 2019 10:34:34 +01:00

irqchip/gic-v3-its: Remove the redundant set_bit for lpi_map

We try to find a free LPI region in device's lpi_map and allocate them
(set them to 1) when we want to allocate LPIs for this device. This is
what bitmap_find_free_region() has done for us. The following set_bit
is redundant and a bit confusing (since we only set_bit against the first
allocated LPI idx). Remove it, and make the set_bit explicit by comment.

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
drivers/irqchip/irq-gic-v3-its.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 8eeb0e2..9380aa4 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2464,6 +2464,7 @@ static int its_alloc_device_irq(struct its_device *dev, int nvecs, irq_hw_number
{
int idx;

+ /* Find a free LPI region in lpi_map and allocate them. */
idx = bitmap_find_free_region(dev->event_map.lpi_map,
dev->event_map.nr_lpis,
get_count_order(nvecs));
@@ -2471,7 +2472,6 @@ static int its_alloc_device_irq(struct its_device *dev, int nvecs, irq_hw_number
return -ENOSPC;

*hwirq = dev->event_map.lpi_base + idx;
- set_bit(idx, dev->event_map.lpi_map);

return 0;
}
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