> -----Original Message-----
> From: Denis Kirjanov <k...@linux-powerpc.org>
> Sent: Tuesday, November 17, 2020 6:43 PM
> To: Radhey Shyam Pandey <radh...@xilinx.com>
> Cc: da...@davemloft.net; netdev@vger.kernel.org; k...@kernel.org;
> Michal Simek <mich...@xilinx.com>; mchehab+sams...@kernel.org;
> gre...@linuxfoundation.org; nicolas.fe...@microchip.com; linux-arm-
> ker...@lists.infradead.org; linux-ker...@vger.kernel.org; git
> <g...@xilinx.com>; Shravya Kumbham <shrav...@xilinx.com>
> Subject: Re: [PATCH net v2] net: emaclite: Add error handling for
> of_address_ and _mdio_setup functions
>
> On 11/17/20, Radhey Shyam Pandey <radhey.shyam.pan...@xilinx.com>
> wrote:
> > From: Shravya Kumbham <shravya.kumb...@xilinx.com>
> >
> > Add ret variable, condition to check the return value and error path
> > for the of_address_to_resource() function. It also adds error handling
> > for mdio setup and decrement refcount of phy node.
> >
> > Addresses-Coverity: Event check_return value.
> > Signed-off-by: Shravya Kumbham <shravya.kumb...@xilinx.com>
> > Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pan...@xilinx.com>
> > ---
> > Changes for v2:
> >
> > - Change subject_prefix to target net tree.
> > - Add error handling for mdio_setup and remove phy_read changes.
> > Error checking of phy_read will be added along with phy_write
> > in a followup patch. Document the changes in commit description.
> > ---
> > drivers/net/ethernet/xilinx/xilinx_emaclite.c | 16 +++++++++++++---
> > 1 file changed, 13 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
> > b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
> > index 0c26f5bcc523..4e0005164785 100644
> > --- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
> > +++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
> > @@ -820,7 +820,7 @@ static int xemaclite_mdio_write(struct mii_bus
> > *bus, int phy_id, int reg, static int xemaclite_mdio_setup(struct
> > net_local *lp, struct device *dev) {
> > struct mii_bus *bus;
> > - int rc;
> > + int rc, ret;
> > struct resource res;
> > struct device_node *np = of_get_parent(lp->phy_node);
> > struct device_node *npp;
> > @@ -834,7 +834,12 @@ static int xemaclite_mdio_setup(struct net_local
> > *lp, struct device *dev)
> > }
> > npp = of_get_parent(np);
> >
> > - of_address_to_resource(npp, 0, &res);
> > + ret = of_address_to_resource(npp, 0, &res);
> > + if (ret) {
> > + dev_err(dev, "%s resource error!\n",
> > + dev->of_node->full_name);
> > + return ret;
> > + }
>
> npp is not returned to of_node_put() in the error case below
Yes, agree. The ref counting of npp device node is broken.
I am planning to send v3 with a separate patch to simplify
this.
[1/2] net: emaclite: Simplify device node ref counting
[2/2] net: emaclite: Add error handling for of_address_
to_resource and xemaclite_mdio_setup functions
>
> > if (lp->ndev->mem_start != res.start) {
> > struct phy_device *phydev;
> > phydev = of_phy_find_device(lp->phy_node); @@ -1173,7
> +1178,11 @@
> > static int xemaclite_of_probe(struct platform_device
> > *ofdev)
> > xemaclite_update_address(lp, ndev->dev_addr);
> >
> > lp->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-
> handle", 0);
> > - xemaclite_mdio_setup(lp, &ofdev->dev);
> > + rc = xemaclite_mdio_setup(lp, &ofdev->dev);
> > + if (rc) {
> > + dev_warn(dev, "error registering MDIO bus: %d\n", rc);
> > + goto error;
> > + }
> >
> > dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
> >
> > @@ -1197,6 +1206,7 @@ static int xemaclite_of_probe(struct
> > platform_device
> > *ofdev)
> > return 0;
> >
> > error:
> > + of_node_put(lp->phy_node);
> > free_netdev(ndev);
> > return rc;
> > }
> > --
> > 2.7.4
> >
> >
