linux-kernel - [PATCH] irqchip/gic-v3-its: Don't override quirk settings with default values

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Date:   Tue, 24 Oct 2023 15:34:31 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        lpieralisi@...nel.org, Dominic Rath <dominic.rath@...-augsburg.net>
Subject: [PATCH] irqchip/gic-v3-its: Don't override quirk settings with default values

When splitting the allocation of the ITS node from its configuration,
some of the default settings were kept in the latter instead of
being moved to the former.

This has the side effect of negating some of the quirk detection that
have happened in between, amongst which the dreaded Synquacer hack
(that also affect Dominic's TI platform).

Move the initialisation of these fields early, so that they can
again be overriden by the Synquacer quirk.

Fixes: 9585a495ac93 ("irqchip/gic-v3-its: Split allocation from initialisation of its_node")
Reported by: Dominic Rath <dominic.rath@...-augsburg.net>
Tested-by: Dominic Rath <dominic.rath@...-augsburg.net>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20231024084831.GA3788@JADEVM-DRA
---

Notes:
    Hi Thomas,
    
    This is an urgent, last-minute fix for a regression that I introduced in -rc6.
    I'd appreciate it if you could send it along to Linus before v6.6 gets released.
    
    Thanks,
    
            M.

 drivers/irqchip/irq-gic-v3-its.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 75a2dd550625..a8c89df1a997 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -5112,8 +5112,6 @@ static int __init its_probe_one(struct its_node *its)
 	}
 	its->cmd_base = (void *)page_address(page);
 	its->cmd_write = its->cmd_base;
-	its->get_msi_base = its_irq_get_msi_base;
-	its->msi_domain_flags = IRQ_DOMAIN_FLAG_ISOLATED_MSI;
 
 	err = its_alloc_tables(its);
 	if (err)
@@ -5362,6 +5360,8 @@ static struct its_node __init *its_node_init(struct resource *res,
 	its->typer = gic_read_typer(its_base + GITS_TYPER);
 	its->base = its_base;
 	its->phys_base = res->start;
+	its->get_msi_base = its_irq_get_msi_base;
+	its->msi_domain_flags = IRQ_DOMAIN_FLAG_ISOLATED_MSI;
 
 	its->numa_node = numa_node;
 	its->fwnode_handle = handle;
-- 
2.39.2