Hi Alexander,
On 04/21/2012 11:26 AM, Alexander Holler wrote:
> Hello,
>
> as for the patch for udlfb, I forgot to mention that this is a candidate
> for all stable trees 3.2 and above.
>
> Btw., the address of the maintainer doesn't seem to be valid anymore.
it is better to cc me on patches to the framebuffer subsystem for such
cases. I don't have much free time so it's rare that I come around to
dig in the mailing list.
>
> Regards,
>
> Alexander
>
> Am 21.04.2012 00:11, schrieb Alexander Holler:
>> Line 0 and 1 were both written to line 0 (on the display) and all
>> subsequent
>> lines had an offset of -1. The result was that the last line on the
>> display
>> was never overwritten by writes to /dev/fbN.
>>
>> The origin of this bug seems to have been udlfb.
>>
>> Signed-off-by: Alexander Holler<holler@xxxxxxxxxxxxx>
>
> Cc: stable@xxxxxxxxxxxxxxx
Patch looks good to me but can be made simpler.
>
>> ---
>> drivers/video/smscufx.c | 2 +-
>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/video/smscufx.c b/drivers/video/smscufx.c
>> index ccbfef5..1e1e2d2 100644
>> --- a/drivers/video/smscufx.c
>> +++ b/drivers/video/smscufx.c
>> @@ -904,7 +904,7 @@ static ssize_t ufx_ops_write(struct fb_info *info,
>> const char __user *buf,
>> result = fb_sys_write(info, buf, count, ppos);
>>
>> if (result> 0) {
>> - int start = max((int)(offset / info->fix.line_length) - 1, 0);
>> + int start = max((int)(offset / info->fix.line_length), 0);
the cast to int as well as the max is superfluous without the -1 as the
value can no longer be negative.
>> int lines = min((u32)((result / info->fix.line_length) + 1),
>> (u32)info->var.yres);
>>
>
Best regards,
Florian Tobias Schandinat
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