From: Yuusuke Ashizuka <ashiduka@xxxxxxxxxxx>
Date: Thu, 20 Aug 2020 18:43:07 +0900
> When this driver is built as a module, I cannot rmmod it after insmoding
> it.
> This is because that this driver calls ravb_mdio_init() at the time of
> probe, and module->refcnt is incremented by alloc_mdio_bitbang() called
> after that.
> Therefore, even if ifup is not performed, the driver is in use and rmmod
> cannot be performed.
>
> $ lsmod
> Module Size Used by
> ravb 40960 1
> $ rmmod ravb
> rmmod: ERROR: Module ravb is in use
>
> Call ravb_mdio_init() at open and free_mdio_bitbang() at close, thereby
> rmmod is possible in the ifdown state.
>
> Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
> Signed-off-by: Yuusuke Ashizuka <ashiduka@xxxxxxxxxxx>
> Reviewed-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxx>
Applied and queued up for -stable, thanks.
