| Message ID | 20200304203330.4967-3-maz@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | irqchip/gic-v4: GICv4.1 architecture support | expand |
Hi Marc On 3/4/20 9:33 PM, Marc Zyngier wrote: > In a system that is only sparsly populated with CPUs, we can end-up with sparsely > redistributors structures that are not initialized. Let's make sure we redistributor structures > don't try and access those when iterating over them (in this case when > checking we have a L2 VPE table). > > Fixes: 4e6437f12d6e ("irqchip/gic-v4.1: Ensure L2 vPE table is allocated at RD level") > Signed-off-by: Marc Zyngier <maz@kernel.org> > Reviewed-by: Zenghui Yu <yuzenghui@huawei.com> > --- > drivers/irqchip/irq-gic-v3-its.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c > index 83b1186ffcad..da883a691028 100644 > --- a/drivers/irqchip/irq-gic-v3-its.c > +++ b/drivers/irqchip/irq-gic-v3-its.c > @@ -2452,6 +2452,10 @@ static bool allocate_vpe_l2_table(int cpu, u32 id) > if (!gic_rdists->has_rvpeid) > return true; > > + /* Skip non-present CPUs */ > + if (!base) > + return true; > + > val = gicr_read_vpropbaser(base + SZ_128K + GICR_VPROPBASER); > > esz = FIELD_GET(GICR_VPROPBASER_4_1_ENTRY_SIZE, val) + 1; > Reviewed-by: Eric Auger <eric.auger@redhat.com> Eric
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 83b1186ffcad..da883a691028 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -2452,6 +2452,10 @@ static bool allocate_vpe_l2_table(int cpu, u32 id) if (!gic_rdists->has_rvpeid) return true; + /* Skip non-present CPUs */ + if (!base) + return true; + val = gicr_read_vpropbaser(base + SZ_128K + GICR_VPROPBASER); esz = FIELD_GET(GICR_VPROPBASER_4_1_ENTRY_SIZE, val) + 1;
In a system that is only sparsly populated with CPUs, we can end-up with redistributors structures that are not initialized. Let's make sure we don't try and access those when iterating over them (in this case when checking we have a L2 VPE table). Fixes: 4e6437f12d6e ("irqchip/gic-v4.1: Ensure L2 vPE table is allocated at RD level") Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Zenghui Yu <yuzenghui@huawei.com> --- drivers/irqchip/irq-gic-v3-its.c | 4 ++++ 1 file changed, 4 insertions(+)