lkml.org 
[lkml]   [2022]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] net: mv643xx_eth: handle EPROBE_DEFER
On Mon, Feb 21, 2022 at 08:24:41AM +0200, Mauri Sandberg wrote:
> Obtaining MAC address may be deferred in cases when the MAC is stored
> in NVMEM block and it may now be ready upon the first retrieval attempt
> returing EPROBE_DEFER. Handle it here and leave logic otherwise as it
> was.
>
> Signed-off-by: Mauri Sandberg <maukka@ext.kapsi.fi>
> ---
> drivers/net/ethernet/marvell/mv643xx_eth.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
> index 105247582684..0694f53981f2 100644
> --- a/drivers/net/ethernet/marvell/mv643xx_eth.c
> +++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
> @@ -2740,7 +2740,10 @@ static int mv643xx_eth_shared_of_add_port(struct platform_device *pdev,
> return -EINVAL;
> }
>
> - of_get_mac_address(pnp, ppd.mac_addr);
> + ret = of_get_mac_address(pnp, ppd.mac_addr);
> +
> + if (ret == -EPROBE_DEFER)
> + return ret;

Hi Mauri

There appears to be a follow on issue. There can be multiple ports. So
it could be the first port does not use a MAC address from the NVMEM,
but the second one does. The first time in
mv643xx_eth_shared_of_add_port() is successful and a platform device
is added. The second port can then fail with -EPROBE_DEFER. That
causes the probe to fail, but the platform device will not be
removed. The next time the driver is probed, it will add a second
platform device for the first port, causing bad things to happen.

Please can you add code to remove the platform device when the probe
fails.

Andrew

\
 
 \ /
  Last update: 2022-02-21 19:21    [W:0.105 / U:0.784 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site