[PATCH 1/2] HID: redragon: Fix regression in non-Redragon keyboard due to this new driver

[John S Gruber]

The Redragon keyboard uses the second device being presented, but other
devices with the same vendor_id/device_id pair (0x0c45:760b) use the first.
Don't cause its deletion. Problem introduced in commit 85455dd906d5
("HID: redragon: Fix modifier keys for Redragon Asura Keyboard")

Fixes: 85455dd906d5
Signed-off-by: John S Gruber 
---
 drivers/hid/hid-redragon.c | 4 
 1 file changed, 4 deletions(-)

diff --git a/drivers/hid/hid-redragon.c b/drivers/hid/hid-redragon.c
index daf5957..85a5fbb 100644
--- a/drivers/hid/hid-redragon.c
+++ b/drivers/hid/hid-redragon.c
@@ -55,10 +55,6 @@ static int redragon_probe(struct hid_device *dev,
return ret;
}

-   /* do not register unused input device */
-   if (dev->maxapplication == 1)
-   return 0;
-
ret = hid_hw_start(dev, HID_CONNECT_DEFAULT);
if (ret) {
hid_err(dev, "hw start failed\n");
-- 
1.9.1

Re: [PATCH 1/2] HID: redragon: Fix regression in non-Redragon keyboard due to this new driver

[John S Gruber]

Right, Robert.

I tested it and it works to solve the problem I reported.

On Mon, Jul 30, 2018 at 10:05 AM Robert Munteanu  wrote:

> Hi John,
>
> On Sat, 2018-07-28 at 15:53 -0400, John S Gruber wrote:
> > The Redragon keyboard uses the second device being presented, but
> > other
> > devices with the same vendor_id/device_id pair (0x0c45:760b) use the
> > first.
> > Don't cause its deletion. Problem introduced in commit 85455dd906d5
> > ("HID: redragon: Fix modifier keys for Redragon Asura Keyboard")
> >
> > Fixes: 85455dd906d5
> > Signed-off-by: John S Gruber 
> > ---
> >  drivers/hid/hid-redragon.c | 4 
> >  1 file changed, 4 deletions(-)
> >
> > diff --git a/drivers/hid/hid-redragon.c b/drivers/hid/hid-redragon.c
> > index daf5957..85a5fbb 100644
> > --- a/drivers/hid/hid-redragon.c
> > +++ b/drivers/hid/hid-redragon.c
> > @@ -55,10 +55,6 @@ static int redragon_probe(struct hid_device *dev,
> >   return ret;
> >   }
> >
> > - /* do not register unused input device */
> > - if (dev->maxapplication == 1)
> > - return 0;
> > -
> >   ret = hid_hw_start(dev, HID_CONNECT_DEFAULT);
> >   if (ret) {
> >   hid_err(dev, "hw start failed\n");
>
> As I mentioned, this is already fixed by
> dc9b8e85ed95cbe7e3ad0eabb5b48d617bbc365e, scheduled for 4.19, and I
> suggest that we instead add that one to 4.18.
>
> The explanation is that the block you deleted was the whole reason for
> adding the redragon_probe function, so the changes are largely
> equivalent.
>
> Thanks,
>
> Robert
>
>

Re: [PATCH 1/2] HID: redragon: Fix regression in non-Redragon keyboard due to this new driver

[Robert Munteanu]

Hi John,

On Sat, 2018-07-28 at 15:53 -0400, John S Gruber wrote:
> The Redragon keyboard uses the second device being presented, but
> other
> devices with the same vendor_id/device_id pair (0x0c45:760b) use the
> first.
> Don't cause its deletion. Problem introduced in commit 85455dd906d5
> ("HID: redragon: Fix modifier keys for Redragon Asura Keyboard")
> 
> Fixes: 85455dd906d5
> Signed-off-by: John S Gruber 
> ---
>  drivers/hid/hid-redragon.c | 4 
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/hid/hid-redragon.c b/drivers/hid/hid-redragon.c
> index daf5957..85a5fbb 100644
> --- a/drivers/hid/hid-redragon.c
> +++ b/drivers/hid/hid-redragon.c
> @@ -55,10 +55,6 @@ static int redragon_probe(struct hid_device *dev,
>   return ret;
>   }
> 
> - /* do not register unused input device */
> - if (dev->maxapplication == 1)
> - return 0;
> -
>   ret = hid_hw_start(dev, HID_CONNECT_DEFAULT);
>   if (ret) {
>   hid_err(dev, "hw start failed\n");

As I mentioned, this is already fixed by
dc9b8e85ed95cbe7e3ad0eabb5b48d617bbc365e, scheduled for 4.19, and I
suggest that we instead add that one to 4.18.

The explanation is that the block you deleted was the whole reason for
adding the redragon_probe function, so the changes are largely
equivalent.

Thanks,

Robert