clk: st: Make sure clk_init_data is fully initialized

The clk_init_data structure contains several mutually-exclusive members
for different methods to specify the possible parents of a clock,
prompting drivers to initialize only the members they need.  However,
not initializing all members may cause subtle issues, which are only
exposed when CONFIG_INIT_STACK_ALL_PATTERN or CONFIG_INIT_STACK_NONE is
enabled.

Make sure all members are fully initialized, to avoid such bugs, and to
prevent future breakage when converting drivers to a different method
for specifying the parents.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Message-ID: <e43a03b5f0b1a8151835d9823cbbcc03178b5e46.1787239813.git.geert+renesas@glider.be>
Signed-off-by: Brian Masney <bmasney@redhat.com>

drivers/clk/st/clk-flexgen.c

@@ -209,7 +209,7 @@ static struct clk *clk_register_flexgen(const char *name,
 				unsigned long flexgen_flags, bool mode) {
 	struct flexgen *fgxbar;
 	struct clk *clk;
-	struct clk_init_data init;
+	struct clk_init_data init = {};
 	u32  xbar_shift;
 	void __iomem *xbar_reg, *fdiv_reg;
 

drivers/clk/st/clkgen-fsyn.c

@@ -444,9 +444,9 @@ static struct clk * __init st_clk_register_quadfs_pll(
 		struct clkgen_quadfs_data *quadfs, void __iomem *reg,
 		spinlock_t *lock)
 {
+	struct clk_init_data init = {};
 	struct st_clk_quadfs_pll *pll;
 	struct clk *clk;
-	struct clk_init_data init;
 
 	/*
 	 * Sanity check required pointers.
@@ -885,8 +885,8 @@ static struct clk * __init st_clk_register_quadfs_fsynth(
 		unsigned long flags, spinlock_t *lock)
 {
 	struct st_clk_quadfs_fsynth *fs;
+	struct clk_init_data init = {};
 	struct clk *clk;
-	struct clk_init_data init;
 
 	/*
 	 * Sanity check required pointers, note that nsdiv3 is optional.

drivers/clk/st/clkgen-pll.c

@@ -652,9 +652,9 @@ static struct clk * __init clkgen_pll_register(const char *parent_name,
 				void __iomem *reg, unsigned long pll_flags,
 				const char *clk_name, spinlock_t *lock)
 {
+	struct clk_init_data init = {};
 	struct clkgen_pll *pll;
 	struct clk *clk;
-	struct clk_init_data init;
 
 	pll = kzalloc_obj(*pll);
 	if (!pll)