cpufreq: Return index from cpufreq_frequency_table_target()

This routine can't fail unless the frequency table is invalid and
doesn't contain any valid entries.

Make it return the index and WARN() in case it is used for an invalid
table.

Signed-off-by: Viresh Kumar <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

Documentation/cpu-freq/cpu-drivers.txt

···
 
 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
                                    unsigned int target_freq,
-                                   unsigned int relation,
-                                   unsigned int *index);
+                                   unsigned int relation);
 
 is the corresponding frequency table helper for the ->target
-stage. Just pass the values to this function, and the unsigned int
-index returns the number of the frequency table entry which contains
+stage. Just pass the values to this function, and this function
+returns the number of the frequency table entry which contains
 the frequency the CPU shall be set to.
 
 The following macros can be used as iterators over cpufreq_frequency_table:

drivers/cpufreq/amd_freq_sensitivity.c

···
 		else {
 			unsigned int index;
 
-			cpufreq_frequency_table_target(policy,
-				policy->cur - 1, CPUFREQ_RELATION_H, &index);
+			index = cpufreq_frequency_table_target(policy,
+				policy->cur - 1, CPUFREQ_RELATION_H);
 			freq_next = policy->freq_table[index].frequency;
 		}
 

drivers/cpufreq/cpufreq.c

···
 			    unsigned int relation)
 {
 	unsigned int old_target_freq = target_freq;
-	int index, retval;
+	int index;
 
 	if (cpufreq_disabled())
 		return -ENODEV;
···
 	if (!cpufreq_driver->target_index)
 		return -EINVAL;
 
-	retval = cpufreq_frequency_table_target(policy, target_freq, relation,
-						&index);
-	if (unlikely(retval)) {
-		pr_err("%s: Unable to find matching freq\n", __func__);
-		return retval;
-	}
+	index = cpufreq_frequency_table_target(policy, target_freq, relation);
 
 	return __target_index(policy, index);
 }

drivers/cpufreq/cpufreq_ondemand.c

···
 {
 	unsigned int freq_req, freq_reduc, freq_avg;
 	unsigned int freq_hi, freq_lo;
-	unsigned int index = 0;
+	unsigned int index;
 	unsigned int delay_hi_us;
 	struct policy_dbs_info *policy_dbs = policy->governor_data;
 	struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
···
 		return freq_next;
 	}
 
-	cpufreq_frequency_table_target(policy, freq_next, relation, &index);
+	index = cpufreq_frequency_table_target(policy, freq_next, relation);
 	freq_req = freq_table[index].frequency;
 	freq_reduc = freq_req * od_tuners->powersave_bias / 1000;
 	freq_avg = freq_req - freq_reduc;
 
 	/* Find freq bounds for freq_avg in freq_table */
-	index = 0;
-	cpufreq_frequency_table_target(policy, freq_avg, CPUFREQ_RELATION_H,
-				       &index);
+	index = cpufreq_frequency_table_target(policy, freq_avg,
+					       CPUFREQ_RELATION_H);
 	freq_lo = freq_table[index].frequency;
-	index = 0;
-	cpufreq_frequency_table_target(policy, freq_avg, CPUFREQ_RELATION_L,
-				       &index);
+	index = cpufreq_frequency_table_target(policy, freq_avg,
+					       CPUFREQ_RELATION_L);
 	freq_hi = freq_table[index].frequency;
 
 	/* Find out how long we have to be in hi and lo freqs */

drivers/cpufreq/freq_table.c

···
 EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
 
 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
-				   unsigned int target_freq,
-				   unsigned int relation,
-				   unsigned int *index)
+				    unsigned int target_freq,
+				    unsigned int relation)
 {
 	struct cpufreq_frequency_table optimal = {
 		.driver_data = ~0,
···
 	struct cpufreq_frequency_table *pos;
 	struct cpufreq_frequency_table *table = policy->freq_table;
 	unsigned int freq, diff, i = 0;
+	int index;
 
 	pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
 					target_freq, relation, policy->cpu);
···
 		}
 	}
 	if (optimal.driver_data > i) {
-		if (suboptimal.driver_data > i)
-			return -EINVAL;
-		*index = suboptimal.driver_data;
+		if (suboptimal.driver_data > i) {
+			WARN(1, "Invalid frequency table: %d\n", policy->cpu);
+			return 0;
+		}
+
+		index = suboptimal.driver_data;
 	} else
-		*index = optimal.driver_data;
+		index = optimal.driver_data;
 
-	pr_debug("target index is %u, freq is:%u kHz\n", *index,
-		 table[*index].frequency);
-
-	return 0;
+	pr_debug("target index is %u, freq is:%u kHz\n", index,
+		 table[index].frequency);
+	return index;
 }
 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
 

drivers/cpufreq/powernv-cpufreq.c

···
 		struct cpufreq_policy policy;
 
 		cpufreq_get_policy(&policy, cpu);
-		cpufreq_frequency_table_target(&policy, policy.cur,
-					       CPUFREQ_RELATION_C, &index);
+		index = cpufreq_frequency_table_target(&policy, policy.cur,
+					       CPUFREQ_RELATION_C);
 		powernv_cpufreq_target_index(&policy, index);
 		cpumask_andnot(&mask, &mask, policy.cpus);
 	}

drivers/cpufreq/s3c24xx-cpufreq.c

···
 		     __func__, policy, target_freq, relation);
 
 	if (ftab) {
-		if (cpufreq_frequency_table_target(policy, target_freq,
-						   relation, &index)) {
-			s3c_freq_dbg("%s: table failed\n", __func__);
-			return -EINVAL;
-		}
+		index = cpufreq_frequency_table_target(policy, target_freq,
+						       relation);
 
 		s3c_freq_dbg("%s: adjust %d to entry %d (%u)\n", __func__,
 			     target_freq, index, ftab[index].frequency);
···
 		pll = NULL;
 	} else {
 		struct cpufreq_policy tmp_policy;
-		int ret;
 
 		/* we keep the cpu pll table in Hz, to ensure we get an
 		 * accurate value for the PLL output. */
···
 		tmp_policy.cpu = policy->cpu;
 		tmp_policy.freq_table = pll_reg;
 
-		/* cpufreq_frequency_table_target uses a pointer to 'index'
-		 * which is the number of the table entry, not the value of
+		/* cpufreq_frequency_table_target returns the index
+		 * of the table entry, not the value of
 		 * the table entry's index field. */
 
-		ret = cpufreq_frequency_table_target(&tmp_policy, target_freq,
-						     relation, &index);
-
-		if (ret < 0) {
-			pr_err("%s: no PLL available\n", __func__);
-			goto err_notpossible;
-		}
-
+		index = cpufreq_frequency_table_target(&tmp_policy, target_freq,
+						       relation);
 		pll = pll_reg + index;
 
 		s3c_freq_dbg("%s: target %u => %u\n",
···
 	}
 
 	return s3c_cpufreq_settarget(policy, target_freq, pll);
-
- err_notpossible:
-	pr_err("no compatible settings for %d\n", target_freq);
-	return -EINVAL;
 }
 
 struct clk *s3c_cpufreq_clk_get(struct device *dev, const char *name)

drivers/cpufreq/s5pv210-cpufreq.c

···
 	new_freq = s5pv210_freq_table[index].frequency;
 
 	/* Finding current running level index */
-	if (cpufreq_frequency_table_target(policy, old_freq, CPUFREQ_RELATION_H,
-					   &priv_index)) {
-		ret = -EINVAL;
-		goto exit;
-	}
+	priv_index = cpufreq_frequency_table_target(policy, old_freq,
+						    CPUFREQ_RELATION_H);
 
 	arm_volt = dvs_conf[index].arm_volt;
 	int_volt = dvs_conf[index].int_volt;

include/linux/cpufreq.h

···
 
 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 				   unsigned int target_freq,
-				   unsigned int relation,
-				   unsigned int *index);
+				   unsigned int relation);
 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 		unsigned int freq);