Hi Jonathan:
On 2021/8/1 0:45, Jonathan Cameron wrote:
On Tue, 27 Jul 2021 20:52:09 +0800
Tang Bin <tangbin@xxxxxxxxxxxxxxxxxxxx> wrote:
For the function of platform_get_irq(), the example in platform.c is
* int irq = platform_get_irq(pdev, 0);
* if (irq < 0)
* return irq;
So the return value of zero is unnecessary to check. And move it
up to a little bit can simplify the code jump.
Co-developed-by: Zhang Shengju <zhangshengju@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Zhang Shengju <zhangshengju@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Tang Bin <tangbin@xxxxxxxxxxxxxxxxxxxx>
Hi,
Logically it is better to keep the irq handling all together, so
I would prefer we didn't move it.
Got it in this place.
Also, platform_get_irq() is documented as never returning 0, so the current
code is not incorrect. As such, this looks like noise unless there is
some plan to make use of the 0 return value? What benefit do we get from
this change?
Thanks for your reply, I think the benefit of this change maybe just
simplify the code.
Because the return value is never equal to 0, so the check in here is
redundant.
We can make the patch like this:
---
drivers/iio/adc/fsl-imx25-gcq.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/drivers/iio/adc/fsl-imx25-gcq.c b/drivers/iio/adc/fsl-imx25-gcq.c
index 8cb51cf7a..d28976f21 100644
--- a/drivers/iio/adc/fsl-imx25-gcq.c
+++ b/drivers/iio/adc/fsl-imx25-gcq.c
@@ -320,6 +320,10 @@ static int mx25_gcq_probe(struct platform_device *pdev)
if (ret)
return ret;
+ priv->irq = platform_get_irq(pdev, 0);
+ if (priv->irq < 0)
+ return priv->irq;
+
for (i = 0; i != 4; ++i) {
if (!priv->vref[i])
continue;
@@ -336,14 +340,6 @@ static int mx25_gcq_probe(struct platform_device *pdev)
goto err_vref_disable;
}
- priv->irq = platform_get_irq(pdev, 0);
- if (priv->irq <= 0) {
- ret = priv->irq;
- if (!ret)
- ret = -ENXIO;
- goto err_clk_unprepare;
- }
-
priv->irq = platform_get_irq(pdev, 0);
if (priv->irq < 0) {
ret = priv->irq;
goto err_clk_unprepare;
}
If you think this is ok, I will send V2 for you. If you think these
change is meaningless,
just dropped this.
Thanks
Tang Bin
