From: Sekhar Nori <nsekhar@xxxxxx>
Date: Mon, 3 Apr 2017 17:34:28 +0530
> TI's cpsw driver handles both OF and non-OF case for phy
> connect. Unfortunately of_phy_connect() returns NULL on
> error while phy_connect() returns ERR_PTR().
>
> To handle this, cpsw_slave_open() overrides the return value
> from phy_connect() to make it NULL or error.
>
> This leaves a small window, where cpsw_adjust_link() may be
> invoked for a slave while slave->phy pointer is temporarily
> set to -ENODEV (or some other error) before it is finally set
> to NULL.
>
> _cpsw_adjust_link() only handles the NULL case, and an oops
> results when ERR_PTR() is seen by it.
>
> Note that cpsw_adjust_link() checks PHY status for each
> slave whenever it is invoked. It can so happen that even
> though phy_connect() for a given slave returns error,
> _cpsw_adjust_link() is still called for that slave because
> the link status of another slave changed.
>
> Fix this by using a temporary pointer to store return value
> of {of_}phy_connect() and do a one-time write to slave->phy.
>
> Reviewed-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
> Reported-by: Yan Liu <yan-liu@xxxxxx>
> Signed-off-by: Sekhar Nori <nsekhar@xxxxxx>
Applied, thank you.
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