[tip: irq/urgent] irqchip/gic-v3: Only provision redistributors that are enabled in ACPI

[tip-bot2 for Marc Zyngier]

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     926b5dfa6b8dc666ff398044af6906b156e1d949
Gitweb:        https://git.kernel.org/tip/926b5dfa6b8dc666ff398044af6906b156e1d949
Author:        Marc Zyngier <maz@xxxxxxxxxx>
AuthorDate:    Mon, 16 Dec 2019 11:24:57 
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Tue, 28 Jan 2020 13:17:46 

irqchip/gic-v3: Only provision redistributors that are enabled in ACPI

We currently allocate redistributor region structures for
individual redistributors when ACPI doesn't present us with
compact MMIO regions covering multiple redistributors.

It turns out that we allocate these structures even when
the redistributor is flagged as disabled by ACPI. It works
fine until someone actually tries to tarse one of these
structures, and access the corresponding MMIO region.

Instead, track the number of enabled redistributors, and
only allocate what is required. This makes sure that there
is no invalid data to misuse.

Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Reported-by: Heyi Guo <guoheyi@xxxxxxxxxx>
Tested-by: Heyi Guo <guoheyi@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20191216062745.63397-1-guoheyi@xxxxxxxxxx
---
 drivers/irqchip/irq-gic-v3.c |  9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 286f982..c1f7af9 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1839,6 +1839,7 @@ static struct
 	struct redist_region *redist_regs;
 	u32 nr_redist_regions;
 	bool single_redist;
+	int enabled_rdists;
 	u32 maint_irq;
 	int maint_irq_mode;
 	phys_addr_t vcpu_base;
@@ -1933,8 +1934,10 @@ static int __init gic_acpi_match_gicc(union acpi_subtable_headers *header,
 	 * If GICC is enabled and has valid gicr base address, then it means
 	 * GICR base is presented via GICC
 	 */
-	if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address)
+	if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) {
+		acpi_data.enabled_rdists++;
 		return 0;
+	}
 
 	/*
 	 * It's perfectly valid firmware can pass disabled GICC entry, driver
@@ -1964,8 +1967,10 @@ static int __init gic_acpi_count_gicr_regions(void)
 
 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
 				      gic_acpi_match_gicc, 0);
-	if (count > 0)
+	if (count > 0) {
 		acpi_data.single_redist = true;
+		count = acpi_data.enabled_rdists;
+	}
 
 	return count;
 }