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| author | Jean-Philippe Brucker <jean-philippe.brucker@arm.com> | 2019-04-08 18:17:18 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-22 07:37:36 +0200 |
| commit | f273cd16554a92ea746cf117a126ff5be8c54794 (patch) | |
| tree | daeab5ecceb4028968f130cb0d1074a2c2b13ed1 /arch/arm64 | |
| parent | 26e7d2ad97b9dcc1a4618d0803847a31fc013e86 (diff) | |
| download | linux-stable-f273cd16554a92ea746cf117a126ff5be8c54794.tar.gz linux-stable-f273cd16554a92ea746cf117a126ff5be8c54794.tar.bz2 linux-stable-f273cd16554a92ea746cf117a126ff5be8c54794.zip | |
arm64: Clear OSDLR_EL1 on CPU boot
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: <stable@vger.kernel.org>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kernel/debug-monitors.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index 06ca574495af..262925b98f42 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -135,6 +135,7 @@ 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; |