From 9b9f2b8bc2ac98d91da714660c53d1cdac999e09 Mon Sep 17 00:00:00 2001 From: Phil Reid Date: Thu, 24 Aug 2017 17:31:01 +0800 Subject: i2c: i2c-smbus: Use threaded irq for smbalert Prior to this commit the smbalert_irq was handling in the hard irq context. This change switch to using a thread irq which avoids the need for the work thread. Using threaded irq also removes the need for the edge_triggered flag as the enabling / disabling of the hard irq for level triggered interrupts will be handled by the irq core. Without this change have an irq connected to something like an i2c gpio resulted in a null ptr deferences. Specifically handle_nested_irq calls the threaded irq handler. There are currently 3 in tree drivers affected by this change. i2c-parport driver calls i2c_handle_smbus_alert in a hard irq context. This driver use edge trigger interrupts which skip the enable / disable calls. But it still need to handle the smbus transaction on a thread. So the work thread is kept for this driver. i2c-parport-light & i2c-thunderx-pcidrv provide the irq number in the setup which will result in the thread irq being used. i2c-parport-light is edge trigger so the enable / disable call was skipped as well. i2c-thunderx-pcidrv is getting the edge / level trigger setting from of data and was setting the flag as required. However the irq core should handle this automatically. Signed-off-by: Phil Reid Reviewed-by: Benjamin Tissoires Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-parport-light.c | 1 - drivers/i2c/busses/i2c-parport.c | 1 - drivers/i2c/busses/i2c-thunderx-pcidrv.c | 6 ------ 3 files changed, 8 deletions(-) (limited to 'drivers/i2c/busses') diff --git a/drivers/i2c/busses/i2c-parport-light.c b/drivers/i2c/busses/i2c-parport-light.c index faa8fb8f2b8f..fa41ff799533 100644 --- a/drivers/i2c/busses/i2c-parport-light.c +++ b/drivers/i2c/busses/i2c-parport-light.c @@ -123,7 +123,6 @@ static struct i2c_adapter parport_adapter = { /* SMBus alert support */ static struct i2c_smbus_alert_setup alert_data = { - .alert_edge_triggered = 1, }; static struct i2c_client *ara; static struct lineop parport_ctrl_irq = { diff --git a/drivers/i2c/busses/i2c-parport.c b/drivers/i2c/busses/i2c-parport.c index a8e54df4aed6..319209a07353 100644 --- a/drivers/i2c/busses/i2c-parport.c +++ b/drivers/i2c/busses/i2c-parport.c @@ -237,7 +237,6 @@ static void i2c_parport_attach(struct parport *port) /* Setup SMBus alert if supported */ if (adapter_parm[type].smbus_alert) { - adapter->alert_data.alert_edge_triggered = 1; adapter->ara = i2c_setup_smbus_alert(&adapter->adapter, &adapter->alert_data); if (adapter->ara) diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c index df0976f4432a..1a7cad874756 100644 --- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c +++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c @@ -118,8 +118,6 @@ static void thunder_i2c_clock_disable(struct device *dev, struct clk *clk) static int thunder_i2c_smbus_setup_of(struct octeon_i2c *i2c, struct device_node *node) { - u32 type; - if (!node) return -EINVAL; @@ -127,10 +125,6 @@ static int thunder_i2c_smbus_setup_of(struct octeon_i2c *i2c, if (!i2c->alert_data.irq) return -EINVAL; - type = irqd_get_trigger_type(irq_get_irq_data(i2c->alert_data.irq)); - i2c->alert_data.alert_edge_triggered = - (type & IRQ_TYPE_LEVEL_MASK) ? 1 : 0; - i2c->ara = i2c_setup_smbus_alert(&i2c->adap, &i2c->alert_data); if (!i2c->ara) return -ENODEV; -- cgit v1.2.3