OMAP3 clock: Check return values for clk_get()

This patch checks if clk_get() returned success for
the clocks used in function omap2_clk_arch_init().

This version incorporates review comments from
Kevin Hilman and Paul Walmsley.

Signed-off-by: Sanjeev Premi <premi@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index 0e4fdba7f20b61740bbcd21c8715afea6cc35a86..de7391b6bcfd552bbe965b0b496586bcb96c6c00 100644 (file)
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -21,6 +21,7 @@
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/err.h>
 
 #include <plat/cpu.h>
 #include <plat/clock.h>
@@ -286,6 +287,7 @@ static int __init omap3xxx_clk_arch_init(void)
 {
        struct clk *osc_sys_ck, *dpll1_ck, *arm_fck, *core_ck;
        unsigned long osc_sys_rate;
+       bool err = 0;
 
        if (!cpu_is_omap34xx())
                return 0;
@@ -295,9 +297,23 @@ static int __init omap3xxx_clk_arch_init(void)
 
        /* XXX test these for success */
        dpll1_ck = clk_get(NULL, "dpll1_ck");
+       if (WARN(IS_ERR(dpll1_ck), "Failed to get dpll1_ck.\n"))
+               err = 1;
+
        arm_fck = clk_get(NULL, "arm_fck");
+       if (WARN(IS_ERR(arm_fck), "Failed to get arm_fck.\n"))
+               err = 1;
+
        core_ck = clk_get(NULL, "core_ck");
+       if (WARN(IS_ERR(core_ck), "Failed to get core_ck.\n"))
+               err = 1;
+
        osc_sys_ck = clk_get(NULL, "osc_sys_ck");
+       if (WARN(IS_ERR(osc_sys_ck), "Failed to get osc_sys_ck.\n"))
+               err = 1;
+
+       if (err)
+               return -ENOENT;
 
        /* REVISIT: not yet ready for 343x */
        if (clk_set_rate(dpll1_ck, mpurate))