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net: pcs: lynx: check that the fwnode is available prior to use

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Check that the fwnode is marked as available prior to trying to lookup
the PCS device, and return -ENODEV if unavailable. Document the return
codes from lynx_pcs_create_fwnode().

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2023-06-07 12:58:54 +01:00 committed by Jakub Kicinski
parent 05b606b884
commit d143898c6d
1 changed files with 14 additions and 0 deletions
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14
drivers/net/pcs/pcs-lynx.c
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@ -6,6 +6,7 @@
#include <linux/mdio.h>
#include <linux/phylink.h>
#include <linux/pcs-lynx.h>
#include <linux/property.h>
#define SGMII_CLOCK_PERIOD_NS 8 /* PCS is clocked at 125 MHz */
#define LINK_TIMER_VAL(ns) ((u32)((ns) / SGMII_CLOCK_PERIOD_NS))
@ -346,11 +347,24 @@ struct phylink_pcs *lynx_pcs_create_mdiodev(struct mii_bus *bus, int addr)
}
EXPORT_SYMBOL(lynx_pcs_create_mdiodev);
/*
* lynx_pcs_create_fwnode() creates a lynx PCS instance from the fwnode
* device indicated by node.
*
* Returns:
* -ENODEV if the fwnode is marked unavailable
* -EPROBE_DEFER if we fail to find the device
* -ENOMEM if we fail to allocate memory
* pointer to a phylink_pcs on success
*/
struct phylink_pcs *lynx_pcs_create_fwnode(struct fwnode_handle *node)
{
struct mdio_device *mdio;
struct phylink_pcs *pcs;
if (!fwnode_device_is_available(node))
return ERR_PTR(-ENODEV);
mdio = fwnode_mdio_find_device(node);
if (!mdio)
return ERR_PTR(-EPROBE_DEFER);