The patch titled
PHYLIB: fix an interrupt loop potential when halting
has been added to the -mm tree. Its filename is
phylib-fix-an-interrupt-loop-potential-when-halting.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: PHYLIB: fix an interrupt loop potential when halting
From: "Maciej W. Rozycki" <macro@xxxxxxxxxxxxxx>
Ensure the PHY_HALTED state is not entered with the IRQ asserted as it
could lead to an interrupt loop.
There is a small window in phy_stop(), where the state of the PHY machine
indicates it has been halted, but its interrupt output might still be
unmasked. If an interrupt goes active right at this moment it will loop as
the phy_interrupt() handler exits immediately with IRQ_NONE if the halted
state is seen. It is unsafe to extend the phydev spinlock to cover
phy_interrupt(). It is safe to swap the order of the actions though as all
the competing places to unmask the interrupt output of the PHY, which are
phy_change() and phy_timer() are already covered with the lock as is the
sequence in question.
Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx>
Cc: Andy Fleming <afleming@xxxxxxxxxxxxx>
Cc: Jeff Garzik <jgarzik@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/net/phy/phy.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff -puN drivers/net/phy/phy.c~phylib-fix-an-interrupt-loop-potential-when-halting drivers/net/phy/phy.c
--- a/drivers/net/phy/phy.c~phylib-fix-an-interrupt-loop-potential-when-halting
+++ a/drivers/net/phy/phy.c
@@ -737,8 +737,6 @@ void phy_stop(struct phy_device *phydev)
if (PHY_HALTED == phydev->state)
goto out_unlock;
- phydev->state = PHY_HALTED;
-
if (phydev->irq != PHY_POLL) {
/* Disable PHY Interrupts */
phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
@@ -747,6 +745,8 @@ void phy_stop(struct phy_device *phydev)
phy_clear_interrupt(phydev);
}
+ phydev->state = PHY_HALTED;
+
out_unlock:
spin_unlock_bh(&phydev->lock);
_
Patches currently in -mm which might be from macro@xxxxxxxxxxxxxx are
git-mips.patch
git-net.patch
phylib-spinlock-fixes-for-softirqs.patch
phylib-irq-event-workqueue-handling-fixes.patch
phylib-fix-an-interrupt-loop-potential-when-halting.patch
include-linux-typesh-in-if_fddih.patch
avoid-negative-and-full-width-shifts-in-radix-treec.patch
lk201-remove-obsolete-driver.patch
drivers-video-kconfig-fix-fb_pmagb_b-dependencies.patch
drivers-video-pmag-ba-fbc-improve-diagnostics.patch
drivers-video-pmag-ba-fbc-improve-diagnostics-fix.patch
-
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