diff options
| author | Marc Zyngier <maz@kernel.org> | 2020-01-22 16:53:44 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-01-22 17:21:07 +0300 |
| commit | 093bf439fee0d40ade7e309c1288b409cdc3b38f (patch) | |
| tree | a1f4a45affbd7df72750afa530b3e8e5703dc959 /drivers/irqchip | |
| parent | 0f394daef89b38d58c91118a2b08b8a1b316703b (diff) | |
| download | linux-093bf439fee0d40ade7e309c1288b409cdc3b38f.tar.xz | |
irqchip/gic-v3-its: Fix get_vlpi_map() breakage with doorbells
When updating an LPI configuration, get_vlpi_map() may be passed a
irq_data structure relative to an ITS domain (the normal case) or one
that is relative to the core GICv3 domain in the case of a GICv4
doorbell.
In the latter case, special care must be take not to dereference
the irq_chip data as an its_dev structure, as that isn't what is
stored there. Instead, check *first* whether the IRQ is forwarded
to a vcpu, and only then try to obtain the vlpi mapping.
Fixes: c1d4d5cd203c ("irqchip/gic-v3-its: Add its_vlpi_map helpers")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reported-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20200122085609.658-1-yuzenghui@huawei.com
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index e05673bcd52b..b704214390c0 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1170,13 +1170,14 @@ static void its_send_vclear(struct its_device *dev, u32 event_id) */ static struct its_vlpi_map *get_vlpi_map(struct irq_data *d) { - struct its_device *its_dev = irq_data_get_irq_chip_data(d); - u32 event = its_get_event_id(d); + if (irqd_is_forwarded_to_vcpu(d)) { + struct its_device *its_dev = irq_data_get_irq_chip_data(d); + u32 event = its_get_event_id(d); - if (!irqd_is_forwarded_to_vcpu(d)) - return NULL; + return dev_event_to_vlpi_map(its_dev, event); + } - return dev_event_to_vlpi_map(its_dev, event); + return NULL; } static void lpi_write_config(struct irq_data *d, u8 clr, u8 set) |