This is a note to let you know that I've just added the patch titled irqchip: mips-gic: SYNC after enabling GIC region to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: irqchip-mips-gic-sync-after-enabling-gic-region.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 2c0e8382386f618c85d20cb05e7cf7df8cdd382c Mon Sep 17 00:00:00 2001 From: James Hogan <james.hogan@xxxxxxxxxx> Date: Sat, 12 Aug 2017 21:36:09 -0700 Subject: irqchip: mips-gic: SYNC after enabling GIC region From: James Hogan <james.hogan@xxxxxxxxxx> commit 2c0e8382386f618c85d20cb05e7cf7df8cdd382c upstream. 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 Patchwork: https://patchwork.linux-mips.org/patch/17019/ Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/irqchip/irq-mips-gic.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/irqchip/irq-mips-gic.c +++ b/drivers/irqchip/irq-mips-gic.c @@ -1115,8 +1115,11 @@ static int __init gic_of_init(struct dev 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); Patches currently in stable-queue which might be from james.hogan@xxxxxxxxxx are queue-4.9/irqchip-mips-gic-sync-after-enabling-gic-region.patch