Commit 185be5ae authored by Rabin Vincent's avatar Rabin Vincent Committed by David S. Miller

phy: fix crash in fixed_phy_add()

Since e7f4dc35 ("mdio: Move allocation of interrupts into core"),
platforms which call fixed_phy_add() before fixed_mdio_bus_init() is
called (for example, because the platform code and the fixed_phy driver
use the same initcall level) crash in fixed_phy_add() since the
->mii_bus is not allocated.

Also since e7f4dc35, these interrupts are initalized to polling by
default.  The few (old) platforms which directly use fixed_phy_add()
from their platform code all pass PHY_POLL for the irq argument, so we
can keep these platforms not crashing by simply not attempting to set
the irq if PHY_POLL is passed.

Also, even if problems have not been reported on more modern platforms
which used fixed_phy_register() from drivers' probe functions, we return
-EPROBE_DEFER if the MDIO bus is not yet registered so that the probe is
retried later.

Fixes: e7f4dc35 ("mdio: Move allocation of interrupts into core")
Signed-off-by: default avatarRabin Vincent <rabinv@axis.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 52103b70
......@@ -255,6 +255,7 @@ int fixed_phy_add(unsigned int irq, int phy_addr,
memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
if (irq != PHY_POLL)
fmb->mii_bus->irq[phy_addr] = irq;
fp->addr = phy_addr;
......@@ -314,6 +315,9 @@ struct phy_device *fixed_phy_register(unsigned int irq,
int phy_addr;
int ret;
if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED)
return ERR_PTR(-EPROBE_DEFER);
/* Get the next available PHY address, up to PHY_MAX_ADDR */
spin_lock(&phy_fixed_addr_lock);
if (phy_fixed_addr == PHY_MAX_ADDR) {
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment