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mfd: use a dedicated workqueue for pcf50633 irq processing 

Using the default kernel "events" workqueue causes problems with
synchronous adc readings if initiated from some task on the same
workqueue.

I had a deadlock trying to use pcf50633_adc_sync_read from a
power_supply class driver because the reading was initiated from the
workqueue and it waited for the irq processing to complete (to get the
result) and that was put on the same workqueue.

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Paul Fertser 2009-07-28 00:41:15 +04:00 committed by Samuel Ortiz
parent 9c3664ddce
commit ed52e62ebe
2 changed files with 5 additions and 1 deletions
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5
drivers/mfd/pcf50633-core.c
View File

@ -444,7 +444,7 @@ static irqreturn_t pcf50633_irq(int irq, void *data)
get_device(pcf->dev);
disable_irq_nosync(pcf->irq);
schedule_work(&pcf->irq_work);
queue_work(pcf->work_queue, &pcf->irq_work);
return IRQ_HANDLED;
}
@ -575,6 +575,7 @@ static int __devinit pcf50633_probe(struct i2c_client *client,
pcf->dev = &client->dev;
pcf->i2c_client = client;
pcf->irq = client->irq;
pcf->work_queue = create_singlethread_workqueue("pcf50633");
INIT_WORK(&pcf->irq_work, pcf50633_irq_worker);
@ -651,6 +652,7 @@ static int __devinit pcf50633_probe(struct i2c_client *client,
return 0;
err:
destroy_workqueue(pcf->work_queue);
kfree(pcf);
return ret;
}
@ -661,6 +663,7 @@ static int __devexit pcf50633_remove(struct i2c_client *client)
int i;
free_irq(pcf->irq, pcf);
destroy_workqueue(pcf->work_queue);
platform_device_unregister(pcf->input_pdev);
platform_device_unregister(pcf->rtc_pdev);

1
include/linux/mfd/pcf50633/core.h
View File

@ -136,6 +136,7 @@ struct pcf50633 {
int irq;
struct pcf50633_irq irq_handler[PCF50633_NUM_IRQ];
struct work_struct irq_work;
struct workqueue_struct *work_queue;
struct mutex lock;
u8 mask_regs[5];