net: ipa: embed interconnect array in the power structure

Rather than allocating the interconnect array dynamically, represent
the interconnects with a variable-length array at the end of the
ipa_power structure.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ipa/ipa_power.c b/drivers/net/ipa/ipa_power.c
index b1f6978..8a564d7 100644 (file)
--- a/drivers/net/ipa/ipa_power.c
+++ b/drivers/net/ipa/ipa_power.c
@@ -67,7 +67,7 @@ struct ipa_power {
        spinlock_t spinlock;    /* used with STOPPED/STARTED power flags */
        DECLARE_BITMAP(flags, IPA_POWER_FLAG_COUNT);
        u32 interconnect_count;
-       struct icc_bulk_data *interconnect;
+       struct icc_bulk_data interconnect[];
 };
 
 /* Initialize interconnects required for IPA operation */
@@ -75,17 +75,12 @@ static int ipa_interconnect_init(struct ipa_power *power, struct device *dev,
                                 const struct ipa_interconnect_data *data)
 {
        struct icc_bulk_data *interconnect;
-       u32 count;
        int ret;
-
-       count = power->interconnect_count;
-       interconnect = kcalloc(count, sizeof(*interconnect), GFP_KERNEL);
-       if (!interconnect)
-               return -ENOMEM;
-       power->interconnect = interconnect;
+       u32 i;
 
        /* Initialize our interconnect data array for bulk operations */
-       while (count--) {
+       interconnect = &power->interconnect[0];
+       for (i = 0; i < power->interconnect_count; i++) {
                /* interconnect->path is filled in by of_icc_bulk_get() */
                interconnect->name = data->name;
                interconnect->avg_bw = data->average_bandwidth;
@@ -97,7 +92,7 @@ static int ipa_interconnect_init(struct ipa_power *power, struct device *dev,
        ret = of_icc_bulk_get(dev, power->interconnect_count,
                              power->interconnect);
        if (ret)
-               goto err_free;
+               return ret;
 
        /* All interconnects are initially disabled */
        icc_bulk_disable(power->interconnect_count, power->interconnect);
@@ -105,15 +100,7 @@ static int ipa_interconnect_init(struct ipa_power *power, struct device *dev,
        /* Set the bandwidth values to be used when enabled */
        ret = icc_bulk_set_bw(power->interconnect_count, power->interconnect);
        if (ret)
-               goto err_bulk_put;
-
-       return 0;
-
-err_bulk_put:
-       icc_bulk_put(power->interconnect_count, power->interconnect);
-err_free:
-       kfree(power->interconnect);
-       power->interconnect = NULL;
+               icc_bulk_put(power->interconnect_count, power->interconnect);
 
        return ret;
 }
@@ -122,8 +109,6 @@ err_free:
 static void ipa_interconnect_exit(struct ipa_power *power)
 {
        icc_bulk_put(power->interconnect_count, power->interconnect);
-       kfree(power->interconnect);
-       power->interconnect = NULL;
 }
 
 /* Enable IPA power, enabling interconnects and the core clock */
@@ -372,6 +357,7 @@ ipa_power_init(struct device *dev, const struct ipa_power_data *data)
 {
        struct ipa_power *power;
        struct clk *clk;
+       size_t size;
        int ret;
 
        clk = clk_get(dev, "core");
@@ -388,7 +374,8 @@ ipa_power_init(struct device *dev, const struct ipa_power_data *data)
                goto err_clk_put;
        }
 
-       power = kzalloc(sizeof(*power), GFP_KERNEL);
+       size = data->interconnect_count * sizeof(power->interconnect[0]);
+       power = kzalloc(sizeof(*power) + size, GFP_KERNEL);
        if (!power) {
                ret = -ENOMEM;
                goto err_clk_put;