linux-kernel - [PATCH 4.9 41/42] irqchip/irq-gic-v3-its.c: Force synchronisation when issuing INVALL

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Date:   Mon, 13 Dec 2021 10:30:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wudi Wang <wangwudi@...ilicon.com>,
        Shaokun Zhang <zhangshaokun@...ilicon.com>,
        Marc Zyngier <maz@...nel.org>
Subject: [PATCH 4.9 41/42] irqchip/irq-gic-v3-its.c: Force synchronisation when issuing INVALL

From: Wudi Wang <wangwudi@...ilicon.com>

commit b383a42ca523ce54bcbd63f7c8f3cf974abc9b9a upstream.

INVALL CMD specifies that the ITS must ensure any caching associated with
the interrupt collection defined by ICID is consistent with the LPI
configuration tables held in memory for all Redistributors. SYNC is
required to ensure that INVALL is executed.

Currently, LPI configuration data may be inconsistent with that in the
memory within a short period of time after the INVALL command is executed.

Signed-off-by: Wudi Wang <wangwudi@...ilicon.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@...ilicon.com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Fixes: cc2d3216f53c ("irqchip: GICv3: ITS command queue")
Link: https://lore.kernel.org/r/20211208015429.5007-1-zhangshaokun@hisilicon.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/irqchip/irq-gic-v3-its.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -369,7 +369,7 @@ static struct its_collection *its_build_
 
 	its_fixup_cmd(cmd);
 
-	return NULL;
+	return desc->its_invall_cmd.col;
 }
 
 static u64 its_cmd_ptr_to_offset(struct its_node *its,