[PATCH 4/5] DRM: Add support for the sii902x HDMI/DVI encoder

[Sascha Hauer]

On Fri, Jul 08, 2011 at 11:01:18PM +0200, Michał Mirosław wrote:
> 2011/6/7 Sascha Hauer <s.hauer at pengutronix.de>:
> [...]
> > --- /dev/null
> > +++ b/drivers/gpu/drm/i2c/sii902x.c
> > @@ -0,0 +1,334 @@
> [...]
> > +static int sii902x_write(struct i2c_client *client, uint8_t addr, uint8_t val)
> > +{
> > +       int ret;
> > +
> > +       ret = i2c_smbus_write_byte_data(client, addr, val);
> > +       if (ret) {
> > +               dev_dbg(&client->dev, "%s failed with %d\n", __func__, ret);
> > +       }
> > +       return ret;
> > +}
> 
> Return value is never tested.

Yes, but there is not much I can do about it. This function is called
from void functions most of the time, so I can't even forward the error.

> 
> > +static irqreturn_t sii902x_detect_handler(int irq, void *data)
> > +{
> > +       struct sii902x_priv *priv = data;
> > +       struct i2c_client *client = priv->client;
> > +       int dat;
> > +
> > +       dat = sii902x_read(client, 0x3D);
> > +       if (dat & 0x1) {
> > +               /* cable connection changes */
> > +               if (dat & 0x4) {
> > +                       printk("plugin\n");
> > +               } else {
> > +                       printk("plugout\n");
> > +               }
> 
> Missing code?

Yes. I will either remove interrupt support or put the missing code in.

> 
> > +       }
> > +       sii902x_write(client, 0x3D, dat);
> > +
> > +       return IRQ_HANDLED;
> > +}
> [...]
> > +/* I2C driver functions */
> > +
> > +static int
> > +sii902x_probe(struct i2c_client *client, const struct i2c_device_id *id)
> > +{
> > +       int dat, ret;
> > +       struct sii902x_priv *priv;
> > +       const char *drm_name = "imx-drm.0"; /* FIXME: pass from pdata */
> > +       int encon_id = 0; /* FIXME: pass from pdata */
> > +
> > +       priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> > +       if (!priv)
> > +               return -ENOMEM;
> > +
> > +       priv->client = client;
> > +
> > +       /* Set 902x in hardware TPI mode on and jump out of D3 state */
> > +       if (sii902x_write(client, 0xc7, 0x00) < 0) {
> > +               dev_err(&client->dev, "SII902x: cound not find device\n");
> > +               return -ENODEV;
> 
> Leaks priv. Same on other error paths.

Jup, thanks for noting. There are some other bugs in the probe function,
like not checking the return value of drm_encon_register().

Will fix

> 
> > +       }
> [...]
> 
> > +
> > +
> > +static int sii902x_remove(struct i2c_client *client)
> > +{
> > +       struct sii902x_priv *priv;
> > +       int ret;
> > +
> > +       priv = i2c_get_clientdata(client);
> > +
> > +       ret = drm_encon_unregister(&priv->encon);
> > +       if (ret)
> > +               return ret;
> 
> Leaks priv on error.

and forgets to free_irq()

Thanks
 Sascha


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