On Fri, 5 Aug 2016, Robin Murphy wrote: > Hi Julia, > > On 05/08/16 09:56, Julia Lawall wrote: > > Use of_property_read_bool to check for the existence of a property. > > This caught my eye since Rob told me off for doing the same recently[1]. > > > The semantic patch that makes this change is as follows: > > (http://coccinelle.lip6.fr/) > > > > // <smpl> > > @@ > > expression e1,e2; > > statement S2,S1; > > @@ > > - if (of_get_property(e1,e2,NULL)) > > + if (of_property_read_bool(e1,e2)) > > S1 else S2 > > // </smpl> > > > > Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx> > > > > --- > > drivers/soc/ti/knav_qmss_queue.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/soc/ti/knav_qmss_queue.c b/drivers/soc/ti/knav_qmss_queue.c > > index b73e353..56b5d7c 100644 > > --- a/drivers/soc/ti/knav_qmss_queue.c > > +++ b/drivers/soc/ti/knav_qmss_queue.c > > @@ -1240,7 +1240,7 @@ static int knav_setup_queue_range(struct knav_device *kdev, > > if (of_get_property(node, "qalloc-by-id", NULL)) > > According to the binding, "qalloc-by-id" _is_ a boolean property, so > this one really does deserve to be of_property_read_bool()... > > > range->flags |= RANGE_RESERVED; > > > > - if (of_get_property(node, "accumulator", NULL)) { > > + if (of_property_read_bool(node, "accumulator")) { > > ...whereas "accumulator" must have a value, so this isn't technically > appropriate. In general, most of these "if the property exists, read the > property and do stuff" checks are probably a sign of code that could be > simplified by refactoring the "do stuff" step to just specifically > handle the "read the property" step returning -EINVAL when it's not present. Thanks for the very helpful feedback. I will rethink the patch set in light of this information. julia > Robin. > > [1]:https://www.mail-archive.com/iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx/msg13375.html > > > ret = knav_init_acc_range(kdev, node, range); > > if (ret < 0) { > > devm_kfree(dev, range); > > > > > > _______________________________________________ > > linux-arm-kernel mailing list > > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > > > -- > To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
