i2c: Race fix for i2c-mpc.c
The problem was that the clock speed and driver data is
initialized after the i2c adapter was added. This caused
the i2c bus to start working at a wrong speed. (Mostly
noticable on the second bus on mpc5200)
With this patch we've tried to keep the i2c adapter
working perfectly all the time it is included in the system.
Initialize before added, Remove garbage after deleleted.
Submitted-by: Asier Llano Palacios
Signed-off-by: Sylvain Munaut <tnt at 246tNt.com>
Signed-off-by: Kumar Gala <kumar.gala at freescale.com>
---
--- linux-2.6/drivers/i2c/busses/i2c-mpc.c 2005-05-16 09:47:10.000000000 +0200
+++ linux-2.6-mpc52xx/drivers/i2c/busses/i2c-mpc.c 2005-05-16 17:50:18.000000000 +0200
@@ -333,6 +333,9 @@
} else
i2c->irq = 0;
+ mpc_i2c_setclock(i2c);
+ ocp_set_drvdata(ocp, i2c);
+
i2c->adap = mpc_ops;
i2c_set_adapdata(&i2c->adap, i2c);
@@ -341,8 +344,6 @@
goto fail_add;
}
- mpc_i2c_setclock(i2c);
- ocp_set_drvdata(ocp, i2c);
return result;
fail_add:
@@ -358,8 +359,8 @@
static void __devexit mpc_i2c_remove(struct ocp_device *ocp)
{
struct mpc_i2c *i2c = ocp_get_drvdata(ocp);
- ocp_set_drvdata(ocp, NULL);
i2c_del_adapter(&i2c->adap);
+ ocp_set_drvdata(ocp, NULL);
if (ocp->def->irq != OCP_IRQ_NA)
free_irq(i2c->irq, i2c);
@@ -430,6 +431,9 @@
goto fail_irq;
}
+ mpc_i2c_setclock(i2c);
+ dev_set_drvdata(device, i2c);
+
i2c->adap = mpc_ops;
i2c_set_adapdata(&i2c->adap, i2c);
i2c->adap.dev.parent = &pdev->dev;
@@ -438,8 +442,6 @@
goto fail_add;
}
- mpc_i2c_setclock(i2c);
- dev_set_drvdata(device, i2c);
return result;
fail_add:
@@ -456,8 +458,8 @@
{
struct mpc_i2c *i2c = dev_get_drvdata(device);
- dev_set_drvdata(device, NULL);
i2c_del_adapter(&i2c->adap);
+ dev_set_drvdata(device, NULL);
if (i2c->irq != 0)
free_irq(i2c->irq, i2c);
