[Bug 41838] Kernel Crash/Hanging system in connection between WebKit and Gnome-Shell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41838

--- Comment #25 from Peter Weber <peter.weber at ttyhoney.com> 2011-11-06 07:11:34 PST ---
Created attachment 53218
  --> https://bugs.freedesktop.org/attachment.cgi?id=53218
remove r600_ioctl_wait_idle for evergreen (r800) based cards

It seems mit guess was right, if I'm right this patch caused the bug?
https://lkml.org/lkml/2011/6/1/302

I take a look at the source of /drivers/gpu/drm/radeon/radeon_asic.c and
decided to remove "ioctl_wait_idle = r600_ioctl_wait_idle" from "static struct
radeon_asic evergreen_asic". I hope this doesn't cause a new problems, but
maybe I'm lucky:

/drivers/gpu/drm/radeon/r600.c
3533 /**
3534  * r600_ioctl_wait_idle - flush host path cache on wait idle ioctl
3535  * rdev: radeon device structure
3536  * bo: buffer object struct which userspace is waiting for idle
3537  *
3538  * Some R6XX/R7XX doesn't seems to take into account HDP flush performed
3539  * through ring buffer, this leads to corruption in rendering, see
3540  * http://bugzilla.kernel.org/show_bug.cgi?id=15186 to avoid this we
3541  * directly perform HDP flush by writing register through MMIO.
3542  */
3543 void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo
*bo)
{
...
}

My affected card is a Radeon 5650 Mobility, a Evergreen which is ~ R800. So
r600_ioctl_wait_idle() shouldn't be necessary for Evergreen based cards. I've
tested the change now as much as possible for me within the Gnome-Shell and
Framebuffer-Terminals (Suspend to RAM, runs of IOQuake3, glxgears, glchess,
Midori, Firefox).

Thanks

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