Hi Tong Am 04.02.21 um 19:52 schrieb Tong Zhang:
Hi Thomas, The original problem was qxl_device_init() can fail, when it fails there is no need to call qxl_modeset_fini(qdev); qxl_device_fini(qdev); But those two functions are otherwise called in the qxl_drm_release() -
OK, makes sense. Thanks for the explanation.
I have posted an updated patch. The new patch use the following logic + if (!qdev->ddev.mode_config.funcs) + return;
This is again just papering over the issue. Better don't call qxl_drm_release() in the error path if qxl_device_init() fails.
I see two solutions: either roll-back manually, or use our new managed DRM interfaces. This is what the other drivers do.
Best regards Thomas
qxl_modeset_fini(qdev); qxl_device_fini(qdev); Thanks, - TongOn Feb 4, 2021, at 1:34 PM, Thomas Zimmermann <tzimmermann@xxxxxxx> wrote: Hi Am 04.02.21 um 15:57 schrieb Gerd Hoffmann:This reverts commit b91907a6241193465ca92e357adf16822242296d.This should be in the correct format, as given by 'dim cite'. dim cite b91907a6241193465ca92e357adf16822242296d b91907a62411 ("drm/qxl: do not run release if qxl failed to init")Patch is broken, it effectively makes qxl_drm_release() a nop because on normal driver shutdown qxl_drm_release() is called *after* drm_dev_unregister(). Cc: Tong Zhang <ztong0001@xxxxxxxxx> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> --- drivers/gpu/drm/qxl/qxl_drv.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c index 34c8b25b5780..fb5f6a5e81d7 100644 --- a/drivers/gpu/drm/qxl/qxl_drv.c +++ b/drivers/gpu/drm/qxl/qxl_drv.c @@ -144,8 +144,6 @@ static void qxl_drm_release(struct drm_device *dev) * reodering qxl_modeset_fini() + qxl_device_fini() calls is * non-trivial though. */ - if (!dev->registered) - return;I'm not sure what the original problem was, but I'm sure that this isn't the fix for it. If there's a problem with shutdown, the operations rather have to be reordered correctly. With the citation style address: Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>qxl_modeset_fini(qdev); qxl_device_fini(qdev); }-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer
Attachment:
OpenPGP_signature
Description: OpenPGP digital signature
_______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
