2018-07-27 08:59:05

by Jia-Ju Bai

Subject: [PATCH] sound: pci: cthw20k1: Replace mdelay() with msleep()

hw_pll_init(), hw_reset_dac() and hw_card_init() are never
called in atomic context.
They calls mdelay() to busily wait, which is not necessary.
mdelay() can be replaced with msleep().

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <[email protected]>
---
sound/pci/ctxfi/cthw20k1.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/pci/ctxfi/cthw20k1.c b/sound/pci/ctxfi/cthw20k1.c
index 8e6eb9d7984b..6a051a1c3724 100644
--- a/sound/pci/ctxfi/cthw20k1.c
+++ b/sound/pci/ctxfi/cthw20k1.c
@@ -1319,7 +1319,7 @@ static int hw_pll_init(struct hw *hw, unsigned int rsr)
break;

hw_write_20kx(hw, PLLCTL, pllctl);
- mdelay(40);
+ msleep(40);
}
if (i >= 3) {
dev_alert(hw->card->dev, "PLL initialization failed!!!\n");
@@ -1407,7 +1407,7 @@ static int hw_reset_dac(struct hw *hw)
/* To be effective, need to reset the DAC twice. */
for (i = 0; i < 2; i++) {
/* set gpio */
- mdelay(100);
+ msleep(100);
gpioorg = (u16)hw_read_20kx(hw, GPIO);
gpioorg &= 0xfffd;
hw_write_20kx(hw, GPIO, gpioorg);
@@ -2030,7 +2030,7 @@ static int hw_card_init(struct hw *hw, struct card_conf *info)
hw_write_20kx(hw, GIE, 0);
/* Reset all SRC pending interrupts */
hw_write_20kx(hw, SRCIP, 0);
- mdelay(30);
+ msleep(30);

/* Detect the card ID and configure GPIO accordingly. */
switch (hw->model) {
--
2.17.0

2018-07-27 09:52:45

by Takashi Iwai

Subject: Re: [PATCH] sound: pci: cthw20k1: Replace mdelay() with msleep()

On Fri, 27 Jul 2018 10:57:56 +0200,
Jia-Ju Bai wrote:
>
> hw_pll_init(), hw_reset_dac() and hw_card_init() are never
> called in atomic context.
> They calls mdelay() to busily wait, which is not necessary.
> mdelay() can be replaced with msleep().
>
> This is found by a static analysis tool named DCNS written by myself.
>
> Signed-off-by: Jia-Ju Bai <[email protected]>

Applied, thanks.


Takashi