i2c: Shrink struct i2c_client

This shrinks the size of "struct i2c_client" by 40 bytes:

 - Substantially shrinks the string used to identify the chip type
 - The "flags" don't need to be so big
 - Removes some internal padding

It also adds kerneldoc for that struct, explaining how "name" is really a
chip type identifier; it's otherwise potentially confusing.

Because the I2C_NAME_SIZE symbol was abused for both i2c_client.name
and for i2c_adapter.name, this needed to affect i2c_adapter too.  The
adapters which used that symbol now use the more-obviously-correct
idiom of taking the size of that field.

JD: Shorten i2c_adapter.name from 50 to 48 bytes while we're here, to
avoid wasting space in padding.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 21b180904085..5a52bf5e3fb0 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -428,7 +428,7 @@ static int __devinit piix4_probe(struct pci_dev *dev,
         /* set up the sysfs linkage to our parent device */
         piix4_adapter.dev.parent = &dev->dev;
 
-        snprintf(piix4_adapter.name, I2C_NAME_SIZE,
+        snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
                 "SMBus PIIX4 adapter at %04x", piix4_smba);
 
         if ((retval = i2c_add_adapter(&piix4_adapter))) {