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SubjectRe: [PATCH net-next v3 7/7] net: phy: use phy_read_poll_timeout() to simplify the code
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On 3/21/2020 7:48 PM, Dejin Zheng wrote:
> use phy_read_poll_timeout() to replace the poll codes for
> simplify the code in phy_poll_reset() function.
>
> Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
> ---
> v2 -> v3:
> - adapt to it after modifying the parameter order of the
> newly added function
> v1 -> v2:
> - remove the handle of phy_read()'s return error.
>
> drivers/net/phy/phy_device.c | 16 ++++------------
> 1 file changed, 4 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index a585faf8b844..cfe7aae35084 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -1059,23 +1059,15 @@ EXPORT_SYMBOL(phy_disconnect);
> static int phy_poll_reset(struct phy_device *phydev)
> {
> /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
> - unsigned int retries = 12;
> - int ret;
> -
> - do {
> - msleep(50);
> - ret = phy_read(phydev, MII_BMCR);

You are doing some subtle changes here, the sleep used to be *before*
the read of BMCR and now it will be *after*. If there were PHY devices
that required 50ms at least, but would incorrectly return that
BMCR_RESET is cleared *before* 50ms, then we would be breaking those.

I would recommend we drop this patch for now, the rest looks good to me
though.
--
Florian

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