On Tue, 2020-08-25 at 11:39 +0200, Matthias Schiffer wrote:
> On Tue, 2020-08-25 at 11:14 +0200, Ulf Hansson wrote:
> > On Thu, 20 Aug 2020 at 09:59, Matthias Schiffer
> > <matthias.schif...@ew.tq-group.com> wrote:
> > > --- a/drivers/mmc/core/host.c
> > > +++ b/drivers/mmc/core/host.c
> > > @@ -387,6 +387,7 @@ struct mmc_host *mmc_alloc_host(int extra,
> > > struct device *dev)
> > > {
> > > int err;
> > > struct mmc_host *host;
> > > + int alias_id, min_idx, max_idx;
> > >
> > > host = kzalloc(sizeof(struct mmc_host) + extra,
> > > GFP_KERNEL);
> > > if (!host)
> > > @@ -395,7 +396,18 @@ struct mmc_host *mmc_alloc_host(int extra,
> > > struct device *dev)
> > > /* scanning will be enabled when we're ready */
> > > host->rescan_disable = 1;
> > >
> > > - err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
> > > + host->parent = dev;
> > > +
> > > + alias_id = mmc_get_reserved_index(host);
> > > + if (alias_id >= 0) {
> > > + min_idx = alias_id;
> > > + max_idx = alias_id + 1;
> > > + } else {
> > > + min_idx = mmc_first_nonreserved_index();
> > > + max_idx = 0;
> > > + }
> > > +
> > > + err = ida_simple_get(&mmc_host_ida, min_idx, max_idx,
> > > GFP_KERNEL);
One more question I came across when reworking my patch: Do we need a
fallback here for the case where the reserved index is already taken?
To handle an SD card being replaced while still mounted?
> > > if (err < 0) {
> > > kfree(host);
> > > return NULL;
> > > @@ -406,7 +418,6 @@ struct mmc_host *mmc_alloc_host(int extra,
> > > struct device *dev)
> > > dev_set_name(&host->class_dev, "mmc%d", host->index);
> > > host->ws = wakeup_source_register(NULL, dev_name(&host-
> > > > class_dev));
> > >
> > > - host->parent = dev;
> > > host->class_dev.parent = dev;
> > > host->class_dev.class = &mmc_host_class;
> > > device_initialize(&host->class_dev);
> > > --
> > > 2.17.1
> > >
> >
> > Kind regards
> > Uffe
