OMAP: clock: bail out early if arch_clock functions not implemented

Bail out before we take the clockfw_lock spinlock if the corresponding
OMAP1 or OMAP2+ clock function is not defined.  The intention is to
reduce and simplify the work that is done inside the spinlock.

Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 38 insertions, 28 deletions

diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index 2770dddd72c0..c9122dd6ee8d 100644
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -37,14 +37,16 @@ static struct clk_functions *arch_clock;
 int clk_enable(struct clk *clk)
 {
         unsigned long flags;
-        int ret = 0;
+        int ret;
 
         if (clk == NULL || IS_ERR(clk))
                 return -EINVAL;
 
+        if (!arch_clock || !arch_clock->clk_enable)
+                return -EINVAL;
+
         spin_lock_irqsave(&clockfw_lock, flags);
-        if (arch_clock->clk_enable)
-                ret = arch_clock->clk_enable(clk);
+        ret = arch_clock->clk_enable(clk);
         spin_unlock_irqrestore(&clockfw_lock, flags);
 
         return ret;
@@ -58,6 +60,9 @@ void clk_disable(struct clk *clk)
         if (clk == NULL || IS_ERR(clk))
                 return;
 
+        if (!arch_clock || !arch_clock->clk_disable)
+                return;
+
         spin_lock_irqsave(&clockfw_lock, flags);
         if (clk->usecount == 0) {
                 pr_err("Trying disable clock %s with 0 usecount\n",
@@ -66,8 +71,7 @@ void clk_disable(struct clk *clk)
                 goto out;
         }
 
-        if (arch_clock->clk_disable)
-                arch_clock->clk_disable(clk);
+        arch_clock->clk_disable(clk);
 
 out:
         spin_unlock_irqrestore(&clockfw_lock, flags);
@@ -77,7 +81,7 @@ EXPORT_SYMBOL(clk_disable);
 unsigned long clk_get_rate(struct clk *clk)
 {
         unsigned long flags;
-        unsigned long ret = 0;
+        unsigned long ret;
 
         if (clk == NULL || IS_ERR(clk))
                 return 0;
@@ -97,14 +101,16 @@ EXPORT_SYMBOL(clk_get_rate);
 long clk_round_rate(struct clk *clk, unsigned long rate)
 {
         unsigned long flags;
-        long ret = 0;
+        long ret;
 
         if (clk == NULL || IS_ERR(clk))
-                return ret;
+                return 0;
+
+        if (!arch_clock || !arch_clock->clk_round_rate)
+                return 0;
 
         spin_lock_irqsave(&clockfw_lock, flags);
-        if (arch_clock->clk_round_rate)
-                ret = arch_clock->clk_round_rate(clk, rate);
+        ret = arch_clock->clk_round_rate(clk, rate);
         spin_unlock_irqrestore(&clockfw_lock, flags);
 
         return ret;
@@ -119,14 +125,13 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
         if (clk == NULL || IS_ERR(clk))
                 return ret;
 
+        if (!arch_clock || !arch_clock->clk_set_rate)
+                return ret;
+
         spin_lock_irqsave(&clockfw_lock, flags);
-        if (arch_clock->clk_set_rate)
-                ret = arch_clock->clk_set_rate(clk, rate);
-        if (ret == 0) {
-                if (clk->recalc)
-                        clk->rate = clk->recalc(clk);
+        ret = arch_clock->clk_set_rate(clk, rate);
+        if (ret == 0)
                 propagate_rate(clk);
-        }
         spin_unlock_irqrestore(&clockfw_lock, flags);
 
         return ret;
@@ -141,15 +146,14 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
         if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent))
                 return ret;
 
+        if (!arch_clock || !arch_clock->clk_set_parent)
+                return ret;
+
         spin_lock_irqsave(&clockfw_lock, flags);
         if (clk->usecount == 0) {
-                if (arch_clock->clk_set_parent)
-                        ret = arch_clock->clk_set_parent(clk, parent);
-                if (ret == 0) {
-                        if (clk->recalc)
-                                clk->rate = clk->recalc(clk);
+                ret = arch_clock->clk_set_parent(clk, parent);
+                if (ret == 0)
                         propagate_rate(clk);
-                }
         } else
                 ret = -EBUSY;
         spin_unlock_irqrestore(&clockfw_lock, flags);
@@ -399,9 +403,11 @@ void clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
 {
         unsigned long flags;
 
+        if (!arch_clock || !arch_clock->clk_init_cpufreq_table)
+                return;
+
         spin_lock_irqsave(&clockfw_lock, flags);
-        if (arch_clock->clk_init_cpufreq_table)
-                arch_clock->clk_init_cpufreq_table(table);
+        arch_clock->clk_init_cpufreq_table(table);
         spin_unlock_irqrestore(&clockfw_lock, flags);
 }
 
@@ -409,9 +415,11 @@ void clk_exit_cpufreq_table(struct cpufreq_frequency_table **table)
 {
         unsigned long flags;
 
+        if (!arch_clock || !arch_clock->clk_exit_cpufreq_table)
+                return;
+
         spin_lock_irqsave(&clockfw_lock, flags);
-        if (arch_clock->clk_exit_cpufreq_table)
-                arch_clock->clk_exit_cpufreq_table(table);
+        arch_clock->clk_exit_cpufreq_table(table);
         spin_unlock_irqrestore(&clockfw_lock, flags);
 }
 #endif
@@ -429,6 +437,9 @@ static int __init clk_disable_unused(void)
         struct clk *ck;
         unsigned long flags;
 
+        if (!arch_clock || !arch_clock->clk_disable_unused)
+                return 0;
+
         pr_info("clock: disabling unused clocks to save power\n");
         list_for_each_entry(ck, &clocks, node) {
                 if (ck->ops == &clkops_null)
@@ -438,8 +449,7 @@ static int __init clk_disable_unused(void)
                         continue;
 
                 spin_lock_irqsave(&clockfw_lock, flags);
-                if (arch_clock->clk_disable_unused)
-                        arch_clock->clk_disable_unused(ck);
+                arch_clock->clk_disable_unused(ck);
                 spin_unlock_irqrestore(&clockfw_lock, flags);
         }