driver inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9ERMB

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Since commit 4615fbc3788d ("genirq/irqdomain: Don't try to free an interrupt that has no mapping"), we have found failures when re-inserting some specific drivers:

[root@localhost ~]# rmmod hisi_sas_v3_hw [root@localhost ~]# modprobe hisi_sas_v3_hw [ 1295.622525] hisi_sas_v3_hw: probe of 0000:30:04.0 failed with error -2

A relevant discussion can be found at: https://lore.kernel.org/lkml/3d3d0155e66429968cb4f6b4feeae4b3@kernel.org/

This is because IRQs from a low-level domain are not freed together, leaving some leaked. Thus, the next driver insertion fails to allocate the same number of IRQs.

Free a contiguous group of IRQs in one go to fix this issue.

Fixes: 4615fbc3788d ("genirq/irqdomain: Don't try to free an interrupt that has no mapping") Signed-off-by: Jie Zhan zhanjie9@hisilicon.com Reviewed-by: Liao Chang liaochang1@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- kernel/irq/irqdomain.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 0bdef4fe925b..2ec5bd39635c 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1443,13 +1443,24 @@ static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain, unsigned int nr_irqs) { unsigned int i; + int n;

if (!domain->ops->free) return;

for (i = 0; i < nr_irqs; i++) { - if (irq_domain_get_irq_data(domain, irq_base + i)) - domain->ops->free(domain, irq_base + i, 1); + /* Find the largest possible span of IRQs to free in one go */ + for (n = 0; + ((i + n) < nr_irqs) && + (irq_domain_get_irq_data(domain, irq_base + i + n)); + n++) + ; + + if (!n) + continue; + + domain->ops->free(domain, irq_base + i, n); + i += n; } }