hwd accel framebuffer: Newbi question (sleep in sync)

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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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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