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irqchip/gic-v3-its: Fix comparison logic in lpi_range_cmp

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commit 89dc891792 upstream.

The lpi_range_list is supposed to be sorted in ascending order of
->base_id (at least if the range merging is to work), but the current
comparison function returns a positive value if rb->base_id >
ra->base_id, which means that list_sort() will put A after B in that
case - and vice versa, of course.

Fixes: 880cb3cddd (irqchip/gic-v3-its: Refactor LPI allocator)
Cc: stable@vger.kernel.org (v4.19+)
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rasmus Villemoes 2019-03-12 18:33:46 +01:00 committed by Greg Kroah-Hartman
parent daaeeca918
commit aacf2cc814
1 changed files with 1 additions and 1 deletions
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2
drivers/irqchip/irq-gic-v3-its.c
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@ -1477,7 +1477,7 @@ static int lpi_range_cmp(void *priv, struct list_head *a, struct list_head *b)
ra = container_of(a, struct lpi_range, entry);
rb = container_of(b, struct lpi_range, entry);
return rb->base_id - ra->base_id;
return ra->base_id - rb->base_id;
}
static void merge_lpi_ranges(void)