[patch 7/9] smsc-ircc2: PM cleanup - do not close device when suspending

Dmitry Torokhov
2005-05-25T06:53:02Z

[-- Attachment #1: ircc2-pm2.patch --]
[-- Type: text/plain, Size: 2278 bytes --]

IRDA: smsc-ircc2 - avoid closing device and releasing DMA/interrupt
when suspending - they may not be available any more at resume
time.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

drivers/net/irda/smsc-ircc2.c | 35 +++++++++++++++++++++++++++++------
1 files changed, 29 insertions(+), 6 deletions(-)

Index: dtor/drivers/net/irda/smsc-ircc2.c
===================================================================
--- dtor.orig/drivers/net/irda/smsc-ircc2.c
+++ dtor/drivers/net/irda/smsc-ircc2.c
@@ -1579,6 +1579,11 @@ static int smsc_ircc_net_open(struct net
self = (struct smsc_ircc_cb *) dev->priv;
IRDA_ASSERT(self != NULL, return 0;);

+ if (self->io.suspended) {
+ IRDA_DEBUG(0, "%s(), device is suspended\n", __FUNCTION__);
+ return -EAGAIN;
+ }
+
if (request_irq(self->io.irq, smsc_ircc_interrupt, 0, dev->name,
(void *) dev)) {
IRDA_DEBUG(0, "%s(), unable to allocate irq=%d\n",
@@ -1654,11 +1659,17 @@ static int smsc_ircc_suspend(struct devi
{
struct smsc_ircc_cb *self = dev_get_drvdata(dev);

- IRDA_MESSAGE("%s, Suspending\n", driver_name);
-
if (level == SUSPEND_DISABLE && !self->io.suspended) {
- smsc_ircc_net_close(self->netdev);
+ IRDA_DEBUG("%s, Suspending\n", driver_name);
+
+ rtnl_lock();
+ if (netif_running(self->netdev)) {
+ netif_device_detach(self->netdev);
+ disable_irq(self->io.irq);
+ disable_dma(self->io.dma);
+ }
self->io.suspended = 1;
+ rtnl_unlock();
}

return 0;
@@ -1667,13 +1678,25 @@ static int smsc_ircc_suspend(struct devi
static int smsc_ircc_resume(struct device *dev, u32 level)
{
struct smsc_ircc_cb *self = dev_get_drvdata(dev);
+ unsigned long flags;

if (level == RESUME_ENABLE && self->io.suspended) {
+ IRDA_DEBUG("%s, Waking up\n", driver_name);

- smsc_ircc_net_open(self->netdev);
+ rtnl_lock();
+ if (netif_running(self->netdev)) {
+ spin_lock_irqsave(&self->lock, flags);
+ self->io.speed = 0;
+ smsc_ircc_change_speed(self,
+ SMSC_IRCC2_C_IRDA_FALLBACK_SPEED);
+ spin_unlock_irqrestore(&self->lock, flags);
+
+ enable_dma(self->io.dma);
+ enable_irq(self->io.irq);
+ netif_device_attach(self->netdev);
+ }
self->io.suspended = 0;
-
- IRDA_MESSAGE("%s, Waking up\n", driver_name);
+ rtnl_unlock();
}
return 0;
}