linux-kernel - [PATCH 1/2] arm64: add grace period when rebooting

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Message-Id: <20201219143648.56217-2-wsa+renesas@sang-engineering.com>
Date:   Sat, 19 Dec 2020 15:36:46 +0100
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-renesas-soc@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] arm64: add grace period when rebooting

I work on a system where I currently need to reboot via watchdog.
Because the watchdog needs a bit of time to fire, add a grace period
like on arm32 to avoid the false positive warning message.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
 arch/arm64/kernel/process.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 6616486a58fe..3c770329364f 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -204,6 +204,9 @@ void machine_restart(char *cmd)
 	else
 		do_kernel_restart(cmd);
 
+	/* Give a grace period for failure to restart of 1s */
+	mdelay(1000);
+
 	/*
 	 * Whoops - the architecture was unable to reboot.
 	 */
-- 
2.29.2