Re: [PATCH v2 4/4] drm/qxl: use qxl pin function

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Am 29.09.20 um 12:53 schrieb Daniel Vetter:
On Tue, Sep 29, 2020 at 11:51:15AM +0200, Gerd Hoffmann wrote:
Otherwise ttm throws a WARN because we try to pin without a reservation.

Fixes: 9d36d4320462 ("drm/qxl: switch over to the new pin interface")
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
  drivers/gpu/drm/qxl/qxl_object.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/qxl/qxl_object.c b/drivers/gpu/drm/qxl/qxl_object.c
index d3635e3e3267..eb45267d51db 100644
--- a/drivers/gpu/drm/qxl/qxl_object.c
+++ b/drivers/gpu/drm/qxl/qxl_object.c
@@ -145,7 +145,7 @@ int qxl_bo_create(struct qxl_device *qdev,
  		return r;
  	}
  	if (pinned)
-		ttm_bo_pin(&bo->tbo);
+		qxl_bo_pin(bo);
I think this is now after ttm_bo_init, and at that point the object is
visible to lru users and everything. So I do think you need to grab locks
here instead of just incrementing the pin count alone.

It's also I think a bit racy, since ttm_bo_init drops the lock, so someone
might have snuck in and evicted the object already.

I think what you need is to call ttm_bo_init_reserved, then ttm_bo_pin,
then ttm_bo_unreserve, all explicitly.

Ah, yes Daniel is right. I thought I've fixed that up, but looks like I only did that for VMWGFX.

Sorry for the noise, fix to correctly address this is underway.

Regards,
Christian.

-Daniel

  	*bo_ptr = bo;
  	return 0;
  }
--
2.27.0


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