2018-04-10 13:30:17

by Jia-Ju Bai

Subject: [PATCH 1/2] net: wireless: zydas: Replace mdelay with msleep in zd1201_probe

zd1201_probe() is never called in atomic context.

zd1201_probe() is only set as ".probe" in struct usb_driver.

Despite never getting called from atomic context, zd1201_probe()
calls mdelay() to busily wait.
This is not necessary and can be replaced with msleep() to
avoid busy waiting.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.

Signed-off-by: Jia-Ju Bai <[email protected]>
---
drivers/net/wireless/zydas/zd1201.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/zydas/zd1201.c b/drivers/net/wireless/zydas/zd1201.c
index 581e857..12774e9 100644
--- a/drivers/net/wireless/zydas/zd1201.c
+++ b/drivers/net/wireless/zydas/zd1201.c
@@ -1767,7 +1767,7 @@ static int zd1201_probe(struct usb_interface *interface,
goto err_zd;
}

- mdelay(100);
+ msleep(100);
err = zd1201_drvr_start(zd);
if (err)
goto err_zd;
--
1.9.1

2018-04-25 08:15:24

by Kalle Valo

Subject: Re: [1/2] net: wireless: zydas: Replace mdelay with msleep in zd1201_probe

Jia-Ju Bai <[email protected]> wrote:

> zd1201_probe() is never called in atomic context.
>
> zd1201_probe() is only set as ".probe" in struct usb_driver.
>
> Despite never getting called from atomic context, zd1201_probe()
> calls mdelay() to busily wait.
> This is not necessary and can be replaced with msleep() to
> avoid busy waiting.
>
> This is found by a static analysis tool named DCNS written by myself.
> And I also manually check it.
>
> Signed-off-by: Jia-Ju Bai <[email protected]>

I need a review from someone else before I'm willing to take this.

--
https://patchwork.kernel.org/patch/10333189/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches