From: James Hogan <james.hogan@xxxxxxxxxx>
This patch has been added to the v4.1 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 2c0e8382386f618c85d20cb05e7cf7df8cdd382c ]
A SYNC is required between enabling the GIC region and actually trying
to use it, even if the first access is a read, otherwise its possible
depending on the timing (and in my case depending on the precise
alignment of certain kernel code) to hit CM bus errors on that first
access.
Add the SYNC straight after setting the GIC base.
[paul.burton@xxxxxxxxxx:
Changes later in this series increase our likelihood of hitting this
by reducing the amount of code that runs between enabling the GIC &
accessing it.]
Fixes: a7057270c280 ("irqchip: mips-gic: Add device-tree support")
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx>
Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: James Hogan <james.hogan@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # 3.19.x-
Patchwork: https://patchwork.linux-mips.org/patch/17019/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
drivers/irqchip/irq-mips-gic.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 269c2354c431..e1d71574bdb5 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -861,8 +861,11 @@ static int __init gic_of_init(struct device_node *node,
gic_len = resource_size(&res);
}
- if (mips_cm_present())
+ if (mips_cm_present()) {
write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK);
+ /* Ensure GIC region is enabled before trying to access it */
+ __sync();
+ }
gic_present = true;
__gic_init(gic_base, gic_len, cpu_vec, 0, node);
--
2.11.0