[PATCH v1 2/2] net: designware: eqos: do not try to talk to not existing PHY

[Oleksij Rempel]

On Thu, Apr 07, 2022 at 02:23:04PM +0200, Ahmad Fatoum wrote:
> Hello Oleksij,
> 
> On 07.04.22 11:02, Oleksij Rempel wrote:
> > From: Rouven Czerwinski <r.czerwinski at pengutronix.de>
> > 
> > Currently barebox will try to talk to the phy over mdio, even if the
> > parent is a fixed-link. This will result in the following stacktrace:
> 
> Is this not covered by Rouven's 6269556397ed ("net: eqos: let phy_resume
> handle fixed link phys")?

Yes, you right. Please ignore this patch.

> > 
> >   barebox at Linux Automation Test Automation Controller (TAC):/ dhcp
> >   unable to handle NULL pointer dereference at address 0x00000130
> >   pc : [<dfc01800>]    lr : [<dfc0f963>]
> >   sp : dffefd40  ip : 004c4b40  fp : d00286e0
> >   r10: cf25cc4e  r9 : 00000000  r8 : 05f5e100
> >   r7 : 00000130  r6 : 00000000  r5 : 00000000  r4 : 00000130
> >   r3 : 00000109  r2 : 00000000  r1 : 00000000  r0 : 00000130
> >   Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
> >   WARNING: [<dfc01800>] (slice_acquire+0xc/0x28) from [<dfc0f963>] (mdiobus_read+0x13/0x28)
> >   WARNING: [<dfc0f963>] (mdiobus_read+0x13/0x28) from [<dfc10685>] (eqos_start+0x85/0x32c)
> >   WARNING: [<dfc10685>] (eqos_start+0x85/0x32c) from [<dfc3cdf1>] (eth_open+0xd/0x24)
> >   WARNING: [<dfc3cdf1>] (eth_open+0xd/0x24) from [<dfc3e391>] (dhcp+0xb/0x3a)
> >   WARNING: [<dfc3e391>] (dhcp+0xb/0x3a) from [<dfc30fab>] (do_dhcp+0xfb/0x114)
> >   WARNING: [<dfc30fab>] (do_dhcp+0xfb/0x114) from [<dfc0490f>] (execute_command+0x23/0x4c)
> >   WARNING: [<dfc0490f>] (execute_command+0x23/0x4c) from [<dfc0a127>] (run_list_real+0x5bf/0x638)
> >   WARNING: [<dfc0a127>] (run_list_real+0x5bf/0x638) from [<dfc09a2b>] (parse_stream_outer+0xc7/0x154)
> >   WARNING: [<dfc09a2b>] (parse_stream_outer+0xc7/0x154) from [<dfc0a383>] (run_shell+0x3f/0x6c)
> >   WARNING: [<dfc0a383>] (run_shell+0x3f/0x6c) from [<dfc010b9>] (run_init+0x191/0x200)
> >   WARNING: [<dfc010b9>] (run_init+0x191/0x200) from [<dfc01153>] (start_barebox+0x2b/0x6c)
> >   WARNING: [<dfc01153>] (start_barebox+0x2b/0x6c) from [<dfc4be6d>] (barebox_non_pbl_start+0x121/0x164)
> >   WARNING: [<dfc4be6d>] (barebox_non_pbl_start+0x121/0x164) from [<dfc00005>] (__bare_init_start+0x1/0xc)
> > 
> >   WARNING: [<dfc4da7d>] (unwind_backtrace+0x1/0x78) from [<dfc01461>] (panic+0x1d/0x34)
> >   WARNING: [<dfc01461>] (panic+0x1d/0x34) from [<dfc4b6a3>] (do_exception+0xf/0x14)
> >   WARNING: [<dfc4b6a3>] (do_exception+0xf/0x14) from [<dfc4b711>] (do_data_abort+0x21/0x34)
> >   WARNING: [<dfc4b711>] (do_data_abort+0x21/0x34) from [<dfc4b454>] (do_abort_6+0x48/0x54)
> > 
> > Signed-off-by: Rouven Czerwinski <r.czerwinski at pengutronix.de>
> > Signed-off-by: Oleksij Rempel <o.rempel at pengutronix.de>
> > ---
> >  drivers/net/designware_eqos.c | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/net/designware_eqos.c b/drivers/net/designware_eqos.c
> > index 1f97d84880..6b372e4274 100644
> > --- a/drivers/net/designware_eqos.c
> > +++ b/drivers/net/designware_eqos.c
> > @@ -417,9 +417,11 @@ static int eqos_start(struct eth_device *edev)
> >  	/* Before we reset the mac, we must insure the PHY is not powered down
> >  	 * as the dw controller needs all clock domains to be running, including
> >  	 * the PHY clock, to come out of a mac reset.  */
> > -	ret = phy_resume(edev->phydev);
> > -	if (ret)
> > -		return ret;
> > +	if (edev->phydev) {
> > +		ret = phy_resume(edev->phydev);
> > +		if (ret)
> > +			return ret;
> > +	}
> >  
> >  	/* Configure MTL */
> >  
> 
> 
> -- 
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-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |