linux-kernel - Re: [PATCH] xen,input: try to read screen resolution for xen-kbdfront

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Date:   Fri, 27 Jan 2017 07:06:10 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        xen-devel@...ts.xenproject.org, stable@...r.kernel.org
Subject: Re: [PATCH] xen,input: try to read screen resolution for xen-kbdfront

On 24/01/17 19:47, Dmitry Torokhov wrote:
> On Tue, Jan 24, 2017 at 01:09:55PM +0100, Juergen Gross wrote:
>> Instead of using the default resolution of 800*600 for the pointing
>> device of xen-kbdfront try to read the resolution of the (virtual)
>> framebuffer device. Use the default as fallback only.
>>
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>> ---
>>  drivers/input/misc/xen-kbdfront.c | 15 ++++++++++++---
>>  1 file changed, 12 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
>> index 3900875..0032c81 100644
>> --- a/drivers/input/misc/xen-kbdfront.c
>> +++ b/drivers/input/misc/xen-kbdfront.c
>> @@ -16,6 +16,7 @@
>>  #include <linux/kernel.h>
>>  #include <linux/errno.h>
>>  #include <linux/module.h>
>> +#include <linux/fb.h>
>>  #include <linux/input.h>
>>  #include <linux/slab.h>
>>  
>> @@ -108,10 +109,11 @@ static irqreturn_t input_handler(int rq, void *dev_id)
>>  static int xenkbd_probe(struct xenbus_device *dev,
>>  				  const struct xenbus_device_id *id)
>>  {
>> -	int ret, i;
>> +	int ret, i, width, height;
>>  	unsigned int abs;
>>  	struct xenkbd_info *info;
>>  	struct input_dev *kbd, *ptr;
>> +	struct fb_info *fb0;
>>  
>>  	info = kzalloc(sizeof(*info), GFP_KERNEL);
>>  	if (!info) {
>> @@ -173,9 +175,16 @@ static int xenkbd_probe(struct xenbus_device *dev,
>>  	ptr->id.product = 0xfffe;
>>  
>>  	if (abs) {
>> +		width = XENFB_WIDTH;
>> +		height = XENFB_HEIGHT;
>> +		fb0 = registered_fb[0];
> 
> This will break if !CONFIG_FBi I think. While i see that xen.config has
> it on I wonder if it is still possible to turn it off (either randconfig
> or intentionally).

kbuild robot says it is. :-(

Sending V2.


Thanks,

Juergen