4.9-stable review patch. If anyone has any objections, please let me know.
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From: NeilBrown neil@brown.name
commit 891731f6a5dbe508d12443175a7e166a2fba616a upstream.
ralink_halt() does nothing that machine_halt() doesn't already do, so it adds no value.
It actually causes incorrect behaviour due to the "unreachable()" at the end. This tells the compiler that the end of the function will never be reached, which isn't true. The compiler responds by not adding a 'return' instruction, so control simply moves on to whatever bytes come afterwards in memory. In my tested, that was the ralink_restart() function. This means that an attempt to 'halt' the machine would actually cause a reboot.
So remove ralink_halt() so that a 'halt' really does halt.
Fixes: c06e836ada59 ("MIPS: ralink: adds reset code") Signed-off-by: NeilBrown neil@brown.name Cc: John Crispin john@phrozen.org Cc: Ralf Baechle ralf@linux-mips.org Cc: linux-mips@linux-mips.org Cc: stable@vger.kernel.org # 3.9+ Patchwork: https://patchwork.linux-mips.org/patch/18851/ Signed-off-by: James Hogan jhogan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/mips/ralink/reset.c | 7 ------- 1 file changed, 7 deletions(-)
--- a/arch/mips/ralink/reset.c +++ b/arch/mips/ralink/reset.c @@ -96,16 +96,9 @@ static void ralink_restart(char *command unreachable(); }
-static void ralink_halt(void) -{ - local_irq_disable(); - unreachable(); -} - static int __init mips_reboot_setup(void) { _machine_restart = ralink_restart; - _machine_halt = ralink_halt;
return 0; }