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From: Radhey Shyam Pandey <radheys@xilinx.com>
To: Andre Przywara <andre.przywara@arm.com>,
	"David S . Miller" <davem@davemloft.net>
Cc: Michal Simek <michals@xilinx.com>,
	Robert Hancock <hancock@sedsystems.ca>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH 02/14] net: axienet: Propagate failure of DMA descriptor setup
Date: Fri, 10 Jan 2020 17:53:08 +0000
Message-ID: <CH2PR02MB70007946C760D524D56B6F64C7380@CH2PR02MB7000.namprd02.prod.outlook.com> (raw)
In-Reply-To: <CH2PR02MB7000063BD3CFC30D18B06FDFC7380@CH2PR02MB7000.namprd02.prod.outlook.com>

> -----Original Message-----
> From: Radhey Shyam Pandey
> Sent: Friday, January 10, 2020 8:25 PM
> To: Andre Przywara <andre.przywara@arm.com>; David S . Miller
> <davem@davemloft.net>
> Cc: Michal Simek <michals@xilinx.com>; Robert Hancock
> <hancock@sedsystems.ca>; netdev@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; linux-kernel@vger.kernel.org
> Subject: RE: [PATCH 02/14] net: axienet: Propagate failure of DMA descriptor
> setup
> 
> > -----Original Message-----
> > From: Andre Przywara <andre.przywara@arm.com>
> > Sent: Friday, January 10, 2020 5:24 PM
> > To: David S . Miller <davem@davemloft.net>; Radhey Shyam Pandey
> > <radheys@xilinx.com>
> > Cc: Michal Simek <michals@xilinx.com>; Robert Hancock
> > <hancock@sedsystems.ca>; netdev@vger.kernel.org; linux-arm-
> > kernel@lists.infradead.org; linux-kernel@vger.kernel.org
> > Subject: [PATCH 02/14] net: axienet: Propagate failure of DMA
> > descriptor setup
> >
> > When we fail allocating the DMA buffers in axienet_dma_bd_init(), we
> > report this error, but carry on with initialisation nevertheless.
> >
> > This leads to a kernel panic when the driver later wants to send a
> > packet, as it uses uninitialised data structures.
> >
> > Make the axienet_device_reset() routine return an error value, as it
> > contains the DMA buffer initialisation. Make sure we propagate the
> > error up the chain and eventually fail the driver initialisation, to
> > avoid relying on non-initialised buffers.
> >
> > Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
> 
> > ---
> >  .../net/ethernet/xilinx/xilinx_axienet_main.c | 25
> > +++++++++++++------
> >  1 file changed, 18 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> > b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> > index 20746b801959..97482cf093ce 100644
> > --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> > +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> > @@ -437,9 +437,10 @@ static void axienet_setoptions(struct net_device
> > *ndev, u32 options)
> >  	lp->options |= options;
> >  }
> >
> > -static void __axienet_device_reset(struct axienet_local *lp)
> > +static int __axienet_device_reset(struct axienet_local *lp)
> >  {
> >  	u32 timeout;
> > +
> >  	/* Reset Axi DMA. This would reset Axi Ethernet core as well. The
> > reset
> >  	 * process of Axi DMA takes a while to complete as all pending
> >  	 * commands/transfers will be flushed or completed during this @@
> > -455,9 +456,11 @@ static void __axienet_device_reset(struct
> > axienet_local *lp)
> >  		if (--timeout == 0) {
> >  			netdev_err(lp->ndev, "%s: DMA reset timeout!\n",
> >  				   __func__);
> > -			break;
> > +			return -ETIMEDOUT;
> >  		}
> >  	}
> > +
> > +	return 0;
> >  }
> >
> >  /**
> > @@ -471,12 +474,15 @@ static void __axienet_device_reset(struct
> > axienet_local *lp)
> >   * Ethernet core. No separate hardware reset is done for the Axi Ethernet
> >   * core.
> >   */

Minor nit- we need to add descripton for return value.
drivers/net/ethernet/xilinx/xilinx_axienet_main.c:491: warning: 
No description found for return value of 'axienet_device_reset'

> > -static void axienet_device_reset(struct net_device *ndev)
> > +static int axienet_device_reset(struct net_device *ndev)
> >  {
> >  	u32 axienet_status;
> >  	struct axienet_local *lp = netdev_priv(ndev);
> > +	int ret;
> >
> > -	__axienet_device_reset(lp);
> > +	ret = __axienet_device_reset(lp);
> > +	if (ret)
> > +		return ret;
> >
> >  	lp->max_frm_size = XAE_MAX_VLAN_FRAME_SIZE;
> >  	lp->options |= XAE_OPTION_VLAN;
> > @@ -491,9 +497,11 @@ static void axienet_device_reset(struct
> > net_device
> > *ndev)
> >  			lp->options |= XAE_OPTION_JUMBO;
> >  	}
> >
> > -	if (axienet_dma_bd_init(ndev)) {
> > +	ret = axienet_dma_bd_init(ndev);
> > +	if (ret) {
> >  		netdev_err(ndev, "%s: descriptor allocation failed\n",
> >  			   __func__);
> > +		return ret;
> >  	}
> >
> >  	axienet_status = axienet_ior(lp, XAE_RCW1_OFFSET); @@ -518,6
> +526,8
> > @@ static void axienet_device_reset(struct net_device
> > *ndev)
> >  	axienet_setoptions(ndev, lp->options);
> >
> >  	netif_trans_update(ndev);
> > +
> > +	return 0;
> >  }
> >
> >  /**
> > @@ -921,8 +931,9 @@ static int axienet_open(struct net_device *ndev)
> >  	 */
> >  	mutex_lock(&lp->mii_bus->mdio_lock);
> >  	axienet_mdio_disable(lp);
> > -	axienet_device_reset(ndev);
> > -	ret = axienet_mdio_enable(lp);
> > +	ret = axienet_device_reset(ndev);
> > +	if (ret == 0)
> > +		ret = axienet_mdio_enable(lp);
> >  	mutex_unlock(&lp->mii_bus->mdio_lock);
> >  	if (ret < 0)
> >  		return ret;
> > --
> > 2.17.1


  reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 11:54 [PATCH 00/14] net: axienet: Error handling, SGMII and 64-bit DMA fixes Andre Przywara
2020-01-10 11:54 ` [PATCH 01/14] net: xilinx: temac: Relax Kconfig dependencies Andre Przywara
2020-01-10 14:19   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 02/14] net: axienet: Propagate failure of DMA descriptor setup Andre Przywara
2020-01-10 14:54   ` Radhey Shyam Pandey
2020-01-10 17:53     ` Radhey Shyam Pandey [this message]
2020-01-10 11:54 ` [PATCH 03/14] net: axienet: Fix DMA descriptor cleanup path Andre Przywara
2020-01-10 15:14   ` Radhey Shyam Pandey
2020-01-10 15:43     ` Andre Przywara
2020-01-10 17:05       ` Radhey Shyam Pandey
2020-01-16 18:03         ` Andre Przywara
2020-01-20 18:32           ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 04/14] net: axienet: Improve DMA error handling Andre Przywara
2020-01-10 15:26   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 05/14] net: axienet: Factor out TX descriptor chain cleanup Andre Przywara
2020-01-10 18:04   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 06/14] net: axienet: Check for DMA mapping errors Andre Przywara
2020-01-13  5:54   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 07/14] net: axienet: Fix SGMII support Andre Przywara
2020-01-10 14:04   ` Andrew Lunn
2020-01-10 14:20     ` Andre Przywara
2020-01-10 14:26       ` Andrew Lunn
2020-01-10 15:04       ` Russell King - ARM Linux admin
2020-01-10 15:22         ` Russell King - ARM Linux admin
2020-01-10 17:04           ` Russell King - ARM Linux admin
2020-01-18 11:22             ` Russell King - ARM Linux admin
2020-01-20 14:50               ` Andre Przywara
2020-01-20 15:45                 ` Russell King - ARM Linux admin
2020-01-27 17:04                   ` Andre Przywara
2020-01-27 17:20                     ` Radhey Shyam Pandey
2020-01-27 18:53                     ` Russell King - ARM Linux admin
2020-01-10 14:58   ` Russell King - ARM Linux admin
2020-01-10 17:32     ` Andre Przywara
2020-01-10 18:05       ` Russell King - ARM Linux admin
2020-01-10 19:33         ` Andrew Lunn
2020-01-10 11:54 ` [PATCH 08/14] net: axienet: Drop MDIO interrupt registers from ethtools dump Andre Przywara
2020-01-13  6:02   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 09/14] net: axienet: Add mii-tool support Andre Przywara
2020-01-13  6:12   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 10/14] net: axienet: Wrap DMA pointer writes to prepare for 64 bit Andre Przywara
2020-01-10 11:54 ` [PATCH 11/14] net: axienet: Upgrade descriptors to hold 64-bit addresses Andre Przywara
2020-01-14 16:35   ` Radhey Shyam Pandey
2020-01-14 17:29     ` Andre Przywara
2020-01-10 11:54 ` [PATCH 12/14] net: axienet: Autodetect 64-bit DMA capability Andre Przywara
2020-01-10 14:08   ` Andrew Lunn
2020-01-10 14:13     ` Andre Przywara
2020-01-10 14:22       ` Andrew Lunn
2020-01-10 15:08         ` Andre Przywara
2020-01-10 15:22           ` Andrew Lunn
2020-01-14 17:03   ` Radhey Shyam Pandey
2020-01-14 17:41     ` Andre Przywara
2020-01-15  6:02       ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 13/14] net: axienet: Allow DMA to beyond 4GB Andre Przywara
2020-01-10 11:54 ` [PATCH 14/14] net: axienet: Update devicetree binding documentation Andre Przywara
2020-01-21 21:51   ` Rob Herring
2020-01-24 16:29     ` Andre Przywara
2020-01-27  9:28       ` Radhey Shyam Pandey

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