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| author |   Jianguo Chen <chenjianguo3@huawei.com> | 2019-03-20 18:54:21 +0000 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-20 09:17:00 +0200 |
| commit | 1512c986c5788f34939d0d1e391455ca4a3f8880 (patch) | |
| tree | 78ade6a290f45aa72935eb01101415aedd6d02e6 | |
| parent | dc60ac49b0403073505612ea08e07d5b08ae41a8 (diff) | |
| download | linux-yocto-1512c986c5788f34939d0d1e391455ca4a3f8880.tar.gz linux-yocto-1512c986c5788f34939d0d1e391455ca4a3f8880.tar.bz2 linux-yocto-1512c986c5788f34939d0d1e391455ca4a3f8880.zip | |
irqchip/mbigen: Don't clear eventid when freeing an MSI
[ Upstream commit fca269f201a8d9985c0a31fb60b15d4eb57cef80 ]
mbigen_write_msg clears eventid bits of a mbigen register
when free a interrupt, because msi_domain_deactivate memset
struct msg to zero. Then multiple mbigen pins with zero eventid
will report the same interrupt number.
The eventid clear call trace:
free_irq
__free_irq
irq_shutdown
irq_domain_deactivate_irq
__irq_domain_deactivate_irq
__irq_domain_deactivate_irq
msi_domain_deactivate
platform_msi_write_msg
mbigen_write_msg
Signed-off-by: Jianguo Chen <chenjianguo3@huawei.com>
[maz: massaged subject]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/irqchip/irq-mbigen.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c index 567b29c47608..98b6e1d4b1a6 100644 --- a/drivers/irqchip/irq-mbigen.c +++ b/drivers/irqchip/irq-mbigen.c @@ -161,6 +161,9 @@ static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg) void __iomem *base = d->chip_data; u32 val; + if (!msg->address_lo && !msg->address_hi) + return; + base += get_mbigen_vec_reg(d->hwirq); val = readl_relaxed(base); |