From: Jean-Philippe Brucker <[email protected]> commit 6fda41bf12615ee7c3ddac88155099b1a8cf8d00 upstream.
Some firmwares may reboot CPUs with OS Double Lock set. Make sure that it is unlocked, in order to use debug exceptions. Cc: <[email protected]> Signed-off-by: Jean-Philippe Brucker <[email protected]> Signed-off-by: Will Deacon <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/arm64/kernel/debug-monitors.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -133,6 +133,7 @@ NOKPROBE_SYMBOL(disable_debug_monitors); */ static int clear_os_lock(unsigned int cpu) { + write_sysreg(0, osdlr_el1); write_sysreg(0, oslar_el1); isb(); return 0;
