Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 19/82] ARM: 7466/1: disable interrupt before spinning endlessly | Date | Mon, 13 Aug 2012 13:18:55 -0700 |
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From: Greg KH <gregkh@linuxfoundation.org>
3.5-stable review patch. If anyone has any objections, please let me know.
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From: Shawn Guo <shawn.guo@linaro.org>
commit 98bd8b96b26db3399a48202318dca4aaa2515355 upstream.
The CPU will endlessly spin at the end of machine_halt and machine_restart calls. However, this will lead to a soft lockup warning after about 20 seconds, if CONFIG_LOCKUP_DETECTOR is enabled, as system timer is still alive.
Disable interrupt before going to spin endlessly, so that the lockup warning will never be seen.
Reported-by: Marek Vasut <marex@denx.de> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/arm/kernel/process.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -247,6 +247,7 @@ void machine_shutdown(void) void machine_halt(void) { machine_shutdown(); + local_irq_disable(); while (1); } @@ -268,6 +269,7 @@ void machine_restart(char *cmd) /* Whoops - the platform was unable to reboot. Tell the user! */ printk("Reboot failed -- System halted\n"); + local_irq_disable(); while (1); }
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