From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Yifeng Li <tomli@tomli.me>,
Paul Burton <paul.burton@mips.com>,
linux-mips@vger.kernel.org, Huacai Chen <chenhc@lemote.com>,
Ralf Baechle <ralf@linux-mips.org>,
James Hogan <jhogan@kernel.org>,
Aaro Koskinen <aaro.koskinen@iki.fi>
Subject: [PATCH 4.19 22/44] mips: loongson64: remove unreachable(), fix loongson_poweroff().
Date: Wed, 13 Feb 2019 19:38:23 +0100 [thread overview]
Message-ID: <20190213183653.613005602@linuxfoundation.org> (raw)
In-Reply-To: <20190213183651.648060257@linuxfoundation.org>
4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Yifeng Li <tomli@tomli.me>
commit 8a96669d77897ff3613157bf43f875739205d66d upstream.
On my Yeeloong 8089, I noticed the machine fails to shutdown
properly, and often, the function mach_prepare_reboot() is
unexpectedly executed, thus the machine reboots instead. A
wait loop is needed to ensure the system is in a well-defined
state before going down.
In commit 997e93d4df16 ("MIPS: Hang more efficiently on
halt/powerdown/restart"), a general superset of the wait loop for all
platforms is already provided, so we don't need to implement our own.
This commit simply removes the unreachable() compiler marco after
mach_prepare_reboot(), thus allowing the execution of machine_hang().
My test shows that the machine is now able to shutdown successfully.
Please note that there are two different bugs preventing the machine
from shutting down, another work-in-progress commit is needed to
fix a lockup in cpufreq / i8259 driver, please read Reference, this
commit does not fix that bug.
Reference: https://lkml.org/lkml/2019/2/5/908
Signed-off-by: Yifeng Li <tomli@tomli.me>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: stable@vger.kernel.org # v4.17+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/mips/loongson64/common/reset.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/arch/mips/loongson64/common/reset.c
+++ b/arch/mips/loongson64/common/reset.c
@@ -59,7 +59,12 @@ static void loongson_poweroff(void)
{
#ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
mach_prepare_shutdown();
- unreachable();
+
+ /*
+ * It needs a wait loop here, but mips/kernel/reset.c already calls
+ * a generic delay loop, machine_hang(), so simply return.
+ */
+ return;
#else
void (*fw_poweroff)(void) = (void *)loongson_sysconf.poweroff_addr;
next prev parent reply other threads:[~2019-02-13 18:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190213183651.648060257@linuxfoundation.org>
2019-02-13 18:38 ` [PATCH 4.19 19/44] mips: cm: reprime error cause Greg Kroah-Hartman
2019-02-13 18:38 ` [PATCH 4.19 20/44] MIPS: OCTEON: dont set octeon_dma_bar_type if PCI is disabled Greg Kroah-Hartman
2019-02-13 18:38 ` [PATCH 4.19 21/44] MIPS: VDSO: Use same -m%-float cflag as the kernel proper Greg Kroah-Hartman
2019-02-13 18:38 ` Greg Kroah-Hartman [this message]
2019-02-13 18:38 ` [PATCH 4.19 23/44] MIPS: VDSO: Include $(ccflags-vdso) in o32,n32 .lds builds Greg Kroah-Hartman
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