clk: at91: optimize pmc data allocation

Alloc whole data structure in one block. This makes the code shorter,
more efficient and easier to extend in following patch.

Signed-off-by: Michał Mirosław <[email protected]>
Link: https://lkml.kernel.org/r/fc6f6d67b8cee0beace4a9d9cca7431e5efa769d.1588630999.git.mirq-linux@rere.qmqm.pl
Acked-by: Alexandre Belloni <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

Author: osctobe

drivers/clk/at91/at91rm9200.c

@@ -187,7 +187,7 @@ static void __init at91rm9200_pmc_setup(struct device_node *np)
 	return;
 
 err_free:
-	pmc_data_free(at91rm9200_pmc);
+	kfree(at91rm9200_pmc);
 }
 /*
  * While the TCB can be used as the clocksource, the system timer is most likely

drivers/clk/at91/at91sam9260.c

@@ -462,7 +462,7 @@ static void __init at91sam926x_pmc_setup(struct device_node *np,
 	return;
 
 err_free:
-	pmc_data_free(at91sam9260_pmc);
+	kfree(at91sam9260_pmc);
 }
 
 static void __init at91sam9260_pmc_setup(struct device_node *np)

drivers/clk/at91/at91sam9g45.c

@@ -210,7 +210,7 @@ static void __init at91sam9g45_pmc_setup(struct device_node *np)
 	return;
 
 err_free:
-	pmc_data_free(at91sam9g45_pmc);
+	kfree(at91sam9g45_pmc);
 }
 /*
  * The TCB is used as the clocksource so its clock is needed early. This means

drivers/clk/at91/at91sam9n12.c

@@ -228,7 +228,7 @@ static void __init at91sam9n12_pmc_setup(struct device_node *np)
 	return;
 
 err_free:
-	pmc_data_free(at91sam9n12_pmc);
+	kfree(at91sam9n12_pmc);
 }
 /*
  * The TCB is used as the clocksource so its clock is needed early. This means

drivers/clk/at91/at91sam9rl.c

@@ -166,6 +166,6 @@ static void __init at91sam9rl_pmc_setup(struct device_node *np)
 	return;
 
 err_free:
-	pmc_data_free(at91sam9rl_pmc);
+	kfree(at91sam9rl_pmc);
 }
 CLK_OF_DECLARE_DRIVER(at91sam9rl_pmc, "atmel,at91sam9rl-pmc", at91sam9rl_pmc_setup);

drivers/clk/at91/at91sam9x5.c

@@ -278,7 +278,7 @@ static void __init at91sam9x5_pmc_setup(struct device_node *np,
 	return;
 
 err_free:
-	pmc_data_free(at91sam9x5_pmc);
+	kfree(at91sam9x5_pmc);
 }
 
 static void __init at91sam9g15_pmc_setup(struct device_node *np)

drivers/clk/at91/pmc.c

@@ -76,48 +76,30 @@ struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data)
 	return ERR_PTR(-EINVAL);
 }
 
-void pmc_data_free(struct pmc_data *pmc_data)
-{
-	kfree(pmc_data->chws);
-	kfree(pmc_data->shws);
-	kfree(pmc_data->phws);
-	kfree(pmc_data->ghws);
-}
-
 struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
 				   unsigned int nperiph, unsigned int ngck)
 {
-	struct pmc_data *pmc_data = kzalloc(sizeof(*pmc_data), GFP_KERNEL);
+	unsigned int num_clks = ncore + nsystem + nperiph + ngck;
+	struct pmc_data *pmc_data;
 
+	pmc_data = kzalloc(struct_size(pmc_data, hwtable, num_clks),
+			   GFP_KERNEL);
 	if (!pmc_data)
 		return NULL;
 
 	pmc_data->ncore = ncore;
-	pmc_data->chws = kcalloc(ncore, sizeof(struct clk_hw *), GFP_KERNEL);
-	if (!pmc_data->chws)
-		goto err;
+	pmc_data->chws = pmc_data->hwtable;
 
 	pmc_data->nsystem = nsystem;
-	pmc_data->shws = kcalloc(nsystem, sizeof(struct clk_hw *), GFP_KERNEL);
-	if (!pmc_data->shws)
-		goto err;
+	pmc_data->shws = pmc_data->chws + ncore;
 
 	pmc_data->nperiph = nperiph;
-	pmc_data->phws = kcalloc(nperiph, sizeof(struct clk_hw *), GFP_KERNEL);
-	if (!pmc_data->phws)
-		goto err;
+	pmc_data->phws = pmc_data->shws + nsystem;
 
 	pmc_data->ngck = ngck;
-	pmc_data->ghws = kcalloc(ngck, sizeof(struct clk_hw *), GFP_KERNEL);
-	if (!pmc_data->ghws)
-		goto err;
+	pmc_data->ghws = pmc_data->phws + nperiph;
 
 	return pmc_data;
-
-err:
-	pmc_data_free(pmc_data);
-
-	return NULL;
 }
 
 #ifdef CONFIG_PM

drivers/clk/at91/pmc.h

@@ -24,6 +24,8 @@ struct pmc_data {
 	struct clk_hw **phws;
 	unsigned int ngck;
 	struct clk_hw **ghws;
+
+	struct clk_hw *hwtable[];
 };
 
 struct clk_range {
@@ -95,7 +97,6 @@ struct clk_pcr_layout {
 #define nck(a) (a[ARRAY_SIZE(a) - 1].id + 1)
 struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
 				   unsigned int nperiph, unsigned int ngck);
-void pmc_data_free(struct pmc_data *pmc_data);
 
 int of_at91_get_clk_range(struct device_node *np, const char *propname,
 			  struct clk_range *range);

drivers/clk/at91/sam9x60.c

@@ -299,7 +299,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
 	return;
 
 err_free:
-	pmc_data_free(sam9x60_pmc);
+	kfree(sam9x60_pmc);
 }
 /* Some clks are used for a clocksource */
 CLK_OF_DECLARE(sam9x60_pmc, "microchip,sam9x60-pmc", sam9x60_pmc_setup);

drivers/clk/at91/sama5d2.c

@@ -351,6 +351,6 @@ static void __init sama5d2_pmc_setup(struct device_node *np)
 	return;
 
 err_free:
-	pmc_data_free(sama5d2_pmc);
+	kfree(sama5d2_pmc);
 }
 CLK_OF_DECLARE_DRIVER(sama5d2_pmc, "atmel,sama5d2-pmc", sama5d2_pmc_setup);