On Thu, 27 May 2021 23:30:59 +0200,
Dmitry Torokhov wrote:
>
> Hi Takashi,
>
> On Thu, May 27, 2021 at 07:31:53PM +0200, Takashi Iwai wrote:
> > The recent change in elants_i2c driver to support more chips
> > introduced a regression leading to Oops at probing. The driver reads
> > id->driver_data, but the id may be NULL depending on the device type
> > the driver gets bound.
> >
> > Replace the driver data extraction with the device_get_match_data()
> > helper, and define the driver data in OF table, too.
> >
> > Fixes: 9517b95bdc46 ("Input: elants_i2c - add support for eKTF3624")
> > BugLink: https://bugzilla.suse.com/show_bug.cgi?id=1186454
> > Cc: <stable@xxxxxxxxxxxxxxx>
> > Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
> > ---
> > v1->v2: Use device_get_match_data()
> >
> > drivers/input/touchscreen/elants_i2c.c | 6 +++---
> > 1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
> > index 17540bdb1eaf..29b5bb03cff9 100644
> > --- a/drivers/input/touchscreen/elants_i2c.c
> > +++ b/drivers/input/touchscreen/elants_i2c.c
> > @@ -1396,7 +1396,7 @@ static int elants_i2c_probe(struct i2c_client *client,
>
> Might want to switch to probe_new() to avoid same/similar issue down
> the road, either in the same patch or in a separate one.
I think it's better to split. Will submit v3 with the fixes mentioned
below.
thanks,
Takashi
>
>
> > init_completion(&ts->cmd_done);
> >
> > ts->client = client;
> > - ts->chip_id = (enum elants_chip_id)id->driver_data;
> > + ts->chip_id = (enum elants_chip_id)device_get_match_data(&client->dev);
>
> I think this might need to go through an intermediate cast to shut up
> compiler warnings:
>
> ts->chip_id = (enum elants_chip_id)(uintptr_t)
> device_get_match_data(&client->dev);
>
> > i2c_set_clientdata(client, ts);
> >
> > ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
> > @@ -1636,8 +1636,8 @@ MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
> >
> > #ifdef CONFIG_OF
> > static const struct of_device_id elants_of_match[] = {
> > - { .compatible = "elan,ekth3500" },
> > - { .compatible = "elan,ektf3624" },
> > + { .compatible = "elan,ekth3500", .data = EKTH3500 },
> > + { .compatible = "elan,ektf3624", .data = EKTF3624 },
>
> As the bot mentioned this needs a cast.
>
> > { /* sentinel */ }
> > };
> > MODULE_DEVICE_TABLE(of, elants_of_match);
> > --
> > 2.26.2
> >
>
> Thanks.
>
> --
> Dmitry
>
