watchdog: Move watchdog_dev to data section (BSS may not be cleared)

This patch moves all instances of static "watchdog_dev" declarations to
the "data" section. This may be needed, as the BSS may not be cleared
in the early U-Boot phase, where watchdog_reset() is already beeing
called. This may result in incorrect pointer access, as the check to
"!watchdog_dev" in watchdog_reset() may not be true and the function
may continue to run.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: "Marek Behún" <marek.behun@nic.cz>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Tested-by: Michal Simek <michal.simek@xilinx.com> (on zcu100)
Reviewed-by: Michal Simek <michal.simek@xilinx.com>

arch/mips/mach-mt7620/cpu.c

@@ -70,7 +70,7 @@ int print_cpuinfo(void)
 }
 
 #ifdef CONFIG_WATCHDOG
-static struct udevice *watchdog_dev;
+static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL;
 
 /* Called by macro WATCHDOG_RESET */
 void watchdog_reset(void)

board/CZ.NIC/turris_mox/turris_mox.c

@@ -120,7 +120,7 @@ int board_fix_fdt(void *blob)
 #endif
 
 #ifdef CONFIG_WDT_ARMADA_37XX
-static struct udevice *watchdog_dev;
+static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL;
 
 void watchdog_reset(void)
 {

board/CZ.NIC/turris_omnia/turris_omnia.c

@@ -365,7 +365,7 @@ static bool disable_mcu_watchdog(void)
 #endif
 
 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION)
-static struct udevice *watchdog_dev = NULL;
+static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL;
 #endif
 
 int board_init(void)

board/xilinx/microblaze-generic/microblaze-generic.c

@@ -25,7 +25,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT)
-static struct udevice *watchdog_dev;
+static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL;
 #endif /* !CONFIG_SPL_BUILD && CONFIG_WDT */
 
 ulong ram_base;

board/xilinx/zynq/board.c

@@ -19,17 +19,12 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT)
-static struct udevice *watchdog_dev;
+static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL;
 #endif
 
 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_BOARD_EARLY_INIT_F)
 int board_early_init_f(void)
 {
-# if defined(CONFIG_WDT)
-	/* bss is not cleared at time when watchdog_reset() is called */
-	watchdog_dev = NULL;
-# endif
-
 	return 0;
 }
 #endif

board/xilinx/zynqmp/zynqmp.c

@@ -25,7 +25,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT)
-static struct udevice *watchdog_dev;
+static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL;
 #endif
 
 #if defined(CONFIG_FPGA) && defined(CONFIG_FPGA_ZYNQMPPL) && \
@@ -322,11 +322,6 @@ int board_early_init_f(void)
 	ret = psu_init();
 #endif
 
-#if defined(CONFIG_WDT) && !defined(CONFIG_SPL_BUILD)
-	/* bss is not cleared at time when watchdog_reset() is called */
-	watchdog_dev = NULL;
-#endif
-
 	return ret;
 }