diff mbox series

[v2,02/12] i2c: riic: Use temporary variable for struct device

Message ID 20240625121358.590547-3-claudiu.beznea.uj@bp.renesas.com
State Superseded
Delegated to: Andi Shyti
Headers show
Series i2c: riic: Add support for Renesas RZ/G3S | expand

Commit Message

Claudiu Beznea June 25, 2024, 12:13 p.m. UTC 
From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Use a temporary variable for the struct device pointers to avoid
dereferencing. While at it, replace riic->adapter.dev argument of
dev_err() from riic_init_hw() with the temporary variable (pointing to
riic->adapter.dev.parent).

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---

Changes in v2:
- updated commit description to reflect all the changes done

 drivers/i2c/busses/i2c-riic.c | 53 ++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 25 deletions(-)

Comments

Andi Shyti July 4, 2024, 10:30 p.m. UTC | #1 
Hi Claudiu,

...

> Use a temporary variable for the struct device pointers to avoid
> dereferencing.

So far just refactoring...

> While at it, replace riic->adapter.dev argument of
> dev_err() from riic_init_hw() with the temporary variable (pointing to
> riic->adapter.dev.parent).

This is the real change in this patch and you are not explaining
why you did it.

...

> @@ -303,11 +304,12 @@ static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)
>  	int ret = 0;
>  	unsigned long rate;
>  	int total_ticks, cks, brl, brh;
> +	struct device *dev = riic->adapter.dev.parent;
>  
> -	pm_runtime_get_sync(riic->adapter.dev.parent);
> +	pm_runtime_get_sync(dev);
>  
>  	if (t->bus_freq_hz > I2C_MAX_FAST_MODE_FREQ) {
> -		dev_err(&riic->adapter.dev,
> +		dev_err(dev,
>  			"unsupported bus speed (%dHz). %d max\n",
>  			t->bus_freq_hz, I2C_MAX_FAST_MODE_FREQ);

I personally prefer the reference to the current device, it's
more traceable. If you think it's not providing enough
information, then you can improve it, but I wouldn't like to lose
reference to this driver in the log.

Andi
Claudiu Beznea July 8, 2024, 5:13 a.m. UTC | #2 
Hi, Andi,

On 05.07.2024 01:30, Andi Shyti wrote:
> Hi Claudiu,
> 
> ...
> 
>> Use a temporary variable for the struct device pointers to avoid
>> dereferencing.
> 
> So far just refactoring...
> 
>> While at it, replace riic->adapter.dev argument of
>> dev_err() from riic_init_hw() with the temporary variable (pointing to
>> riic->adapter.dev.parent).
> 
> This is the real change in this patch and you are not explaining
> why you did it.
> 
> ...
> 
>> @@ -303,11 +304,12 @@ static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)
>>  	int ret = 0;
>>  	unsigned long rate;
>>  	int total_ticks, cks, brl, brh;
>> +	struct device *dev = riic->adapter.dev.parent;
>>  
>> -	pm_runtime_get_sync(riic->adapter.dev.parent);
>> +	pm_runtime_get_sync(dev);
>>  
>>  	if (t->bus_freq_hz > I2C_MAX_FAST_MODE_FREQ) {
>> -		dev_err(&riic->adapter.dev,
>> +		dev_err(dev,
>>  			"unsupported bus speed (%dHz). %d max\n",
>>  			t->bus_freq_hz, I2C_MAX_FAST_MODE_FREQ);
> 
> I personally prefer the reference to the current device, it's
> more traceable. If you think it's not providing enough

OK, I'll keep it as it was initially.

Thank you,
Claudiu Beznea

> information, then you can improve it, but I wouldn't like to lose
> reference to this driver in the log.
> 
> Andi
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index f608b1838cad..c08c988f50c7 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -131,11 +131,12 @@  static inline void riic_clear_set_bit(struct riic_dev *riic, u8 clear, u8 set, u
 static int riic_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 {
 	struct riic_dev *riic = i2c_get_adapdata(adap);
+	struct device *dev = adap->dev.parent;
 	unsigned long time_left;
 	int i;
 	u8 start_bit;
 
-	pm_runtime_get_sync(adap->dev.parent);
+	pm_runtime_get_sync(dev);
 
 	if (riic_readb(riic, RIIC_ICCR2) & ICCR2_BBSY) {
 		riic->err = -EBUSY;
@@ -168,7 +169,7 @@  static int riic_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 	}
 
  out:
-	pm_runtime_put(adap->dev.parent);
+	pm_runtime_put(dev);
 
 	return riic->err ?: num;
 }
@@ -303,11 +304,12 @@  static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)
 	int ret = 0;
 	unsigned long rate;
 	int total_ticks, cks, brl, brh;
+	struct device *dev = riic->adapter.dev.parent;
 
-	pm_runtime_get_sync(riic->adapter.dev.parent);
+	pm_runtime_get_sync(dev);
 
 	if (t->bus_freq_hz > I2C_MAX_FAST_MODE_FREQ) {
-		dev_err(&riic->adapter.dev,
+		dev_err(dev,
 			"unsupported bus speed (%dHz). %d max\n",
 			t->bus_freq_hz, I2C_MAX_FAST_MODE_FREQ);
 		ret = -EINVAL;
@@ -347,7 +349,7 @@  static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)
 	}
 
 	if (brl > (0x1F + 3)) {
-		dev_err(&riic->adapter.dev, "invalid speed (%lu). Too slow.\n",
+		dev_err(dev, "invalid speed (%lu). Too slow.\n",
 			(unsigned long)t->bus_freq_hz);
 		ret = -EINVAL;
 		goto out;
@@ -396,7 +398,7 @@  static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)
 	riic_clear_set_bit(riic, ICCR1_IICRST, 0, RIIC_ICCR1);
 
 out:
-	pm_runtime_put(riic->adapter.dev.parent);
+	pm_runtime_put(dev);
 	return ret;
 }
 
@@ -415,13 +417,14 @@  static void riic_reset_control_assert(void *data)
 
 static int riic_i2c_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	struct riic_dev *riic;
 	struct i2c_adapter *adap;
 	struct i2c_timings i2c_t;
 	struct reset_control *rstc;
 	int i, ret;
 
-	riic = devm_kzalloc(&pdev->dev, sizeof(*riic), GFP_KERNEL);
+	riic = devm_kzalloc(dev, sizeof(*riic), GFP_KERNEL);
 	if (!riic)
 		return -ENOMEM;
 
@@ -429,22 +432,22 @@  static int riic_i2c_probe(struct platform_device *pdev)
 	if (IS_ERR(riic->base))
 		return PTR_ERR(riic->base);
 
-	riic->clk = devm_clk_get(&pdev->dev, NULL);
+	riic->clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(riic->clk)) {
-		dev_err(&pdev->dev, "missing controller clock");
+		dev_err(dev, "missing controller clock");
 		return PTR_ERR(riic->clk);
 	}
 
-	rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+	rstc = devm_reset_control_get_optional_exclusive(dev, NULL);
 	if (IS_ERR(rstc))
-		return dev_err_probe(&pdev->dev, PTR_ERR(rstc),
+		return dev_err_probe(dev, PTR_ERR(rstc),
 				     "Error: missing reset ctrl\n");
 
 	ret = reset_control_deassert(rstc);
 	if (ret)
 		return ret;
 
-	ret = devm_add_action_or_reset(&pdev->dev, riic_reset_control_assert, rstc);
+	ret = devm_add_action_or_reset(dev, riic_reset_control_assert, rstc);
 	if (ret)
 		return ret;
 
@@ -453,29 +456,29 @@  static int riic_i2c_probe(struct platform_device *pdev)
 		if (ret < 0)
 			return ret;
 
-		ret = devm_request_irq(&pdev->dev, ret, riic_irqs[i].isr,
+		ret = devm_request_irq(dev, ret, riic_irqs[i].isr,
 				       0, riic_irqs[i].name, riic);
 		if (ret) {
-			dev_err(&pdev->dev, "failed to request irq %s\n", riic_irqs[i].name);
+			dev_err(dev, "failed to request irq %s\n", riic_irqs[i].name);
 			return ret;
 		}
 	}
 
-	riic->info = of_device_get_match_data(&pdev->dev);
+	riic->info = of_device_get_match_data(dev);
 
 	adap = &riic->adapter;
 	i2c_set_adapdata(adap, riic);
 	strscpy(adap->name, "Renesas RIIC adapter", sizeof(adap->name));
 	adap->owner = THIS_MODULE;
 	adap->algo = &riic_algo;
-	adap->dev.parent = &pdev->dev;
-	adap->dev.of_node = pdev->dev.of_node;
+	adap->dev.parent = dev;
+	adap->dev.of_node = dev->of_node;
 
 	init_completion(&riic->msg_done);
 
-	i2c_parse_fw_timings(&pdev->dev, &i2c_t, true);
+	i2c_parse_fw_timings(dev, &i2c_t, true);
 
-	pm_runtime_enable(&pdev->dev);
+	pm_runtime_enable(dev);
 
 	ret = riic_init_hw(riic, &i2c_t);
 	if (ret)
@@ -487,24 +490,24 @@  static int riic_i2c_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, riic);
 
-	dev_info(&pdev->dev, "registered with %dHz bus speed\n",
-		 i2c_t.bus_freq_hz);
+	dev_info(dev, "registered with %dHz bus speed\n", i2c_t.bus_freq_hz);
 	return 0;
 
 out:
-	pm_runtime_disable(&pdev->dev);
+	pm_runtime_disable(dev);
 	return ret;
 }
 
 static void riic_i2c_remove(struct platform_device *pdev)
 {
 	struct riic_dev *riic = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
 
-	pm_runtime_get_sync(&pdev->dev);
+	pm_runtime_get_sync(dev);
 	riic_writeb(riic, 0, RIIC_ICIER);
-	pm_runtime_put(&pdev->dev);
+	pm_runtime_put(dev);
 	i2c_del_adapter(&riic->adapter);
-	pm_runtime_disable(&pdev->dev);
+	pm_runtime_disable(dev);
 }
 
 static const struct riic_of_data riic_rz_a_info = {