dev_printk and new-style class devices

From: Jean Delvare
Date: Fri Mar 09 2007 - 10:35:08 EST


Hi Greg, all,

As the new-style class devices (as opposed to old-style struct
class_device) are becoming more widely used, I noticed that the
dev_printk-based functions are not working properly with these.
New-style class devices have no driver nor bus, almost by definition,
and as a result dev_driver_string(), which is used as the first
parameter of dev_printk, resolves to an empty string. This causes
entries like the following to show in my logs:

i2c-2: adapter [SMBus stub driver] registered

Notice the unaesthetical leading whitespace. In order to fix this
problem, I suggest that we extend dev_driver_string to deal with
new-style class devices:

Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
---
drivers/base/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-2.6.21-rc3.orig/drivers/base/core.c 2007-02-28 09:48:19.000000000 +0100
+++ linux-2.6.21-rc3/drivers/base/core.c 2007-03-09 16:01:07.000000000 +0100
@@ -57,7 +57,8 @@ bool is_lanana_major(unsigned int major)
const char *dev_driver_string(struct device *dev)
{
return dev->driver ? dev->driver->name :
- (dev->bus ? dev->bus->name : "");
+ (dev->bus ? dev->bus->name :
+ (dev->class ? dev->class->name : ""));
}
EXPORT_SYMBOL(dev_driver_string);

In the case above, the message in the logs now looks like:

i2c-adapter i2c-2: adapter [SMBus stub driver] registered

Which is much better IMHO. Greg, what do you think?

Thanks,
--
Jean Delvare
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/