[PATCH v2] efi: stop hw watchdog during EBS

[Casey Connolly]

Hardware watchdogs don't currently get stopped as part of
ExitBootServices, this can result in resets during boot if the OS
doesn't have a driver for the watchdog, or if the driver isn't loaded
in time.

As with the EFI watchdog, stop any hardware watchdogs as well.

Signed-off-by: Casey Connolly <casey.connolly at linaro.org>
---
Changes in v2:
* Fix compilation when CONFIG_WATCHDOG is disabled.

---
 lib/efi_loader/efi_boottime.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index ddc935d22409..c34616db578a 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -21,8 +21,9 @@
 #include <time.h>
 #include <u-boot/crc.h>
 #include <usb.h>
 #include <watchdog.h>
+#include <wdt.h>
 #include <asm/global_data.h>
 #include <linux/libfdt_env.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -2263,8 +2264,10 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
 	efi_update_table_header_crc32(&systab.hdr);
 
 	/* Give the payload some time to boot */
 	efi_set_watchdog(0);
+	if (CONFIG_IS_ENABLED(WDT))
+		wdt_stop_all();
 	schedule();
 out:
 	if (IS_ENABLED(CONFIG_EFI_TCG2_PROTOCOL)) {
 		if (ret != EFI_SUCCESS)
-- 
2.52.0