On Thu, Dec 04, 2014 at 01:06:07PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> Commit 1290a958d48e ("usb: phy: propagate __of_usb_find_phy()'s error on
> failure") broke platforms that rely on deferred probing to order probing
> of PHY and host controller drivers. The reason is that the commit simply
> propagates errors from __of_usb_find_phy(), which returns -ENODEV if no
> PHY has been registered yet for a given device tree node. The only case
> in which -EPROBE_DEFER would now be returned is if try_module_get() did
> fail, which does not make sense.
>
> The correct thing to do is to return -EPROBE_DEFER if a PHY hasn't been
> registered yet. The only condition under which it makes sense to return
> -ENODEV is if the device tree node representing the PHY has been
> disabled (via the status property) because in that case the PHY will
> never be registered.
>
> This patch addresses the problem by making __of_usb_find_phy() return an
> appropriate error code while keeping in line with the above-mentioned
> commit to propagate error codes rather than overwriting them. At the
> same time the check for a valid PHY is decoupled from the check for the
> try_module_get() call and a separate error code is returned if the
> latter fails.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> ---
> drivers/usb/phy/phy.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
Ping?
Thierry
Attachment:
pgpUoTTJInfXF.pgp
Description: PGP signature
