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PHYLIB: Spinlock fixes for softirqs

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Use spin_lock_bh()/spin_unlock_bh() for the phydev lock throughout as it
is used in phy_timer() that is called as a softirq and all the other
operations may happen in the user context.

There has been a change recently that did such a conversion for some of the
operations on the lock, but some have been left intact.  Many of them,
perhaps all, may be called in the user context and I was able to trigger
recursive spinlock acquisition indeed, so I think for the sake of long-term
maintenance it is best to convert them all, even if unnecessarily for one
or two -- better safe than sorry.

Perhaps one in phy_timer() could actually be skipped as only called as a
softirq -- I can send an update if that sounds like a good idea.

Checked with checkpatch.pl and at the runtime.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Maciej W. Rozycki 2007-09-28 22:42:12 -07:00 committed by David S. Miller
parent 1f8f4559f8
commit 9ff8c68b3c
2 changed files with 14 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/net/phy/phy.c
View File

@ -424,7 +424,7 @@ int phy_start_aneg(struct phy_device *phydev)
{
int err;
spin_lock(&phydev->lock);
spin_lock_bh(&phydev->lock);
if (AUTONEG_DISABLE == phydev->autoneg)
phy_sanitize_settings(phydev);
@ -445,7 +445,7 @@ int phy_start_aneg(struct phy_device *phydev)
}
out_unlock:
spin_unlock(&phydev->lock);
spin_unlock_bh(&phydev->lock);
return err;
}
EXPORT_SYMBOL(phy_start_aneg);
@ -490,10 +490,10 @@ void phy_stop_machine(struct phy_device *phydev)
{
del_timer_sync(&phydev->phy_timer);
spin_lock(&phydev->lock);
spin_lock_bh(&phydev->lock);
if (phydev->state > PHY_UP)
phydev->state = PHY_UP;
spin_unlock(&phydev->lock);
spin_unlock_bh(&phydev->lock);
phydev->adjust_state = NULL;
}
@ -537,9 +537,9 @@ static void phy_force_reduction(struct phy_device *phydev)
*/
void phy_error(struct phy_device *phydev)
{
spin_lock(&phydev->lock);
spin_lock_bh(&phydev->lock);
phydev->state = PHY_HALTED;
spin_unlock(&phydev->lock);
spin_unlock_bh(&phydev->lock);
}
/**
@ -690,10 +690,10 @@ static void phy_change(struct work_struct *work)
if (err)
goto phy_err;
spin_lock(&phydev->lock);
spin_lock_bh(&phydev->lock);
if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
phydev->state = PHY_CHANGELINK;
spin_unlock(&phydev->lock);
spin_unlock_bh(&phydev->lock);
enable_irq(phydev->irq);
@ -718,7 +718,7 @@ phy_err:
*/
void phy_stop(struct phy_device *phydev)
{
spin_lock(&phydev->lock);
spin_lock_bh(&phydev->lock);
if (PHY_HALTED == phydev->state)
goto out_unlock;
@ -734,7 +734,7 @@ void phy_stop(struct phy_device *phydev)
}
out_unlock:
spin_unlock(&phydev->lock);
spin_unlock_bh(&phydev->lock);
/*
* Cannot call flush_scheduled_work() here as desired because
@ -782,7 +782,7 @@ static void phy_timer(unsigned long data)
int needs_aneg = 0;
int err = 0;
spin_lock(&phydev->lock);
spin_lock_bh(&phydev->lock);
if (phydev->adjust_state)
phydev->adjust_state(phydev->attached_dev);
@ -948,7 +948,7 @@ static void phy_timer(unsigned long data)
break;
}
spin_unlock(&phydev->lock);
spin_unlock_bh(&phydev->lock);
if (needs_aneg)
err = phy_start_aneg(phydev);

4
drivers/net/phy/phy_device.c
View File

@ -670,9 +670,9 @@ static int phy_remove(struct device *dev)
phydev = to_phy_device(dev);
spin_lock(&phydev->lock);
spin_lock_bh(&phydev->lock);
phydev->state = PHY_DOWN;
spin_unlock(&phydev->lock);
spin_unlock_bh(&phydev->lock);
if (phydev->drv->remove)
phydev->drv->remove(phydev);