On Sun, Jan 19, 2014 at 06:38:38AM -0500, Tejun Heo wrote: > On Sun, Jan 19, 2014 at 12:48:50AM +0100, Hans de Goede wrote: > > @@ -126,7 +151,7 @@ static void ahci_put_clks(struct ahci_host_priv *hpriv) > > static int ahci_probe(struct platform_device *pdev) > > { > > struct device *dev = &pdev->dev; > > - struct ahci_platform_data *pdata = dev_get_platdata(dev); > > + const struct ahci_platform_data *pdata = ahci_get_pdata(dev); > > Let's please not add const. For data types which are known to be > terminal, const more or less works, I suppose but for anything even > mildly complicated it ends up being more of a headache. C just > doesn't have enough language support to make const actually useful. > e.g. now if somebody wants to add an accessor to ahci_platform_data() > which is applicable to both readers and writers, we either need two > separate accessors for const and !const paths or have to cast away > const. I don't see anything wrong with this. Platform data should _never_ be written to, because doing so will change the driver behaviour between bindings. It really should be read-only to driver code. -- FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up. Estimation in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad. Estimate before purchase was "up to 13.2Mbit". -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html