hwd accel framebuffer: Newbi question (sleep in sync)

hwd accel framebuffer: Newbi question (sleep in sync)

[Andrey Volkov]

Hi all,

Anyone could explain me, could I or couldn't
use process sleep (i.e. wait_for..., sleep_on...)
in fb_info->fb_sync and/or in any hwd accelerated routines (i.e. blit,
cursor and rectfill)?
Code, which now in kernel, look terrible for me (counter based pooling).
Must it be so?

-- 
Regards
Andrey Volkov

hwd accel framebuffer: Newbi question (sleep in sync)

[Andrey Volkov]

Hi all,

Anyone could explain me, could I or couldn't
use process sleep (i.e. wait_for..., sleep_on...)
in fb_info->fb_sync and/or in any hwd accelerated routines (i.e. blit,
cursor and rectfill)?
Code, which now in kernel, look terrible for me (counter based pooling).
Must it be so?

--
Regards,
Andrey Volkov


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Re: hwd accel framebuffer: Newbi question (sleep in sync)

[Antonino A. Daplas]

On Monday 11 July 2005 16:04, Andrey Volkov wrote:
> Hi all,
>
> Anyone could explain me, could I or couldn't
> use process sleep (i.e. wait_for..., sleep_on...)
> in fb_info->fb_sync and/or in any hwd accelerated routines (i.e. blit,
> cursor and rectfill)?

No, in general, it's not safe to sleep in some of the fb_xxx routines,
especially when fbdev is used by fbcon.

> Code, which now in kernel, look terrible for me (counter based pooling).
> Must it be so?

Yes, because of the above reason. A few drivers though test a "can_sleep"
flag and alter behavior between looping and sleeping.

Tony



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