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net: phy: Threaded interrupts allow some simplification 

The PHY interrupts are now handled in a threaded interrupt handler,
which can sleep. The work queue is no longer needed, phy_change() can
be called directly. phy_mac_interrupt() still needs to be safe to call
in interrupt context, so keep the work queue, and use a helper to call
phy_change().

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2016-10-16 19:56:51 +02:00 committed by David S. Miller
parent c974bdbc3e
commit 664fcf123a
3 changed files with 30 additions and 22 deletions
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45
drivers/net/phy/phy.c
View File

@ -664,7 +664,7 @@ static void phy_error(struct phy_device *phydev)
* @phy_dat: phy_device pointer
*
* Description: When a PHY interrupt occurs, the handler disables
* interrupts, and schedules a work task to clear the interrupt.
* interrupts, and uses phy_change to handle the interrupt.
*/
static irqreturn_t phy_interrupt(int irq, void *phy_dat)
{
@ -673,15 +673,10 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat)
if (PHY_HALTED == phydev->state)
return IRQ_NONE; /* It can't be ours. */
/* The MDIO bus is not allowed to be written in interrupt
* context, so we need to disable the irq here. A work
* queue will write the PHY to disable and clear the
* interrupt, and then reenable the irq line.
*/
disable_irq_nosync(irq);
atomic_inc(&phydev->irq_disable);
queue_work(system_power_efficient_wq, &phydev->phy_queue);
phy_change(phydev);
return IRQ_HANDLED;
}
@ -766,12 +761,6 @@ int phy_stop_interrupts(struct phy_device *phydev)
free_irq(phydev->irq, phydev);
/* Cannot call flush_scheduled_work() here as desired because
* of rtnl_lock(), but we do not really care about what would
* be done, except from enable_irq(), so cancel any work
* possibly pending and take care of the matter below.
*/
cancel_work_sync(&phydev->phy_queue);
/* If work indeed has been cancelled, disable_irq() will have
* been left unbalanced from phy_interrupt() and enable_irq()
* has to be called so that other devices on the line work.
@ -784,14 +773,11 @@ int phy_stop_interrupts(struct phy_device *phydev)
EXPORT_SYMBOL(phy_stop_interrupts);
/**
* phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
* @work: work_struct that describes the work to be done
* phy_change - Called by the phy_interrupt to handle PHY changes
* @phydev: phy_device struct that interrupted
*/
void phy_change(struct work_struct *work)
void phy_change(struct phy_device *phydev)
{
struct phy_device *phydev =
container_of(work, struct phy_device, phy_queue);
if (phy_interrupt_is_valid(phydev)) {
if (phydev->drv->did_interrupt &&
!phydev->drv->did_interrupt(phydev))
@ -832,6 +818,18 @@ phy_err:
phy_error(phydev);
}
/**
* phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes
* @work: work_struct that describes the work to be done
*/
void phy_change_work(struct work_struct *work)
{
struct phy_device *phydev =
container_of(work, struct phy_device, phy_queue);
phy_change(phydev);
}
/**
* phy_stop - Bring down the PHY link, and stop checking the status
* @phydev: target phy_device struct
@ -1116,6 +1114,15 @@ void phy_state_machine(struct work_struct *work)
PHY_STATE_TIME * HZ);
}
/**
* phy_mac_interrupt - MAC says the link has changed
* @phydev: phy_device struct with changed link
* @new_link: Link is Up/Down.
*
* Description: The MAC layer is able indicate there has been a change
* in the PHY link status. Set the new link status, and trigger the
* state machine, work a work queue.
*/
void phy_mac_interrupt(struct phy_device *phydev, int new_link)
{
phydev->link = new_link;

2
drivers/net/phy/phy_device.c
View File

@ -347,7 +347,7 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
mutex_init(&dev->lock);
INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
INIT_WORK(&dev->phy_queue, phy_change);
INIT_WORK(&dev->phy_queue, phy_change_work);
/* Request the appropriate module unconditionally; don't
* bother trying to do so only if it isn't already loaded,

5
include/linux/phy.h
View File

@ -343,7 +343,7 @@ struct phy_c45_device_ids {
* giving up on the current attempt at acquiring a link
* irq: IRQ number of the PHY's interrupt (-1 if none)
* phy_timer: The timer for handling the state machine
* phy_queue: A work_queue for the interrupt
* phy_queue: A work_queue for the phy_mac_interrupt
* attached_dev: The attached enet driver's device instance ptr
* adjust_link: Callback for the enet controller to respond to
* changes in the link state.
@ -802,7 +802,8 @@ int phy_driver_register(struct phy_driver *new_driver, struct module *owner);
int phy_drivers_register(struct phy_driver *new_driver, int n,
struct module *owner);
void phy_state_machine(struct work_struct *work);
void phy_change(struct work_struct *work);
void phy_change(struct phy_device *phydev);
void phy_change_work(struct work_struct *work);
void phy_mac_interrupt(struct phy_device *phydev, int new_link);
void phy_start_machine(struct phy_device *phydev);
void phy_stop_machine(struct phy_device *phydev);