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| author | Rabin Vincent <rabinv@axis.com> | 2016-05-18 12:47:31 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-05-20 10:50:16 -0700 |
| commit | 185be5aef1739fff0298f59b54f2ef7ccf5a849d (patch) | |
| tree | b2135e78203ef0eb6b8bb6495c387a93aeff749e /drivers | |
| parent | 52103b70e13ae1381020b5a9fa15824a9b35baeb (diff) | |
| download | linux-stable-185be5aef1739fff0298f59b54f2ef7ccf5a849d.tar.gz linux-stable-185be5aef1739fff0298f59b54f2ef7ccf5a849d.tar.bz2 linux-stable-185be5aef1739fff0298f59b54f2ef7ccf5a849d.zip | |
phy: fix crash in fixed_phy_add()
Since e7f4dc3536a ("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 e7f4dc3536a, 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: e7f4dc3536a400 ("mdio: Move allocation of interrupts into core")
Signed-off-by: Rabin Vincent <rabinv@axis.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/phy/fixed_phy.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c index 9050f21e6f33..2d2e4339f0df 100644 --- a/drivers/net/phy/fixed_phy.c +++ b/drivers/net/phy/fixed_phy.c @@ -255,7 +255,8 @@ int fixed_phy_add(unsigned int irq, int phy_addr, memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM); - fmb->mii_bus->irq[phy_addr] = irq; + if (irq != PHY_POLL) + fmb->mii_bus->irq[phy_addr] = irq; fp->addr = phy_addr; fp->status = *status; @@ -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) { |