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drm/vmwgfx: Fix regression caused by "drm/ttm: make ttm reservation calls behave like reservation calls" 

The call to ttm_eu_backoff_reservation() as part of an error path would cause
a lock imbalance if the reservation ticket was not initialized. This error is
easily triggered from user-space by submitting a bogus command stream.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Cc: stable@vger.kernel.org
Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
hifive-unleashed-5.1
Thomas Hellstrom 2014-01-30 10:58:19 +01:00
parent 76c7d18bcd
commit cf5e341333
1 changed files with 5 additions and 4 deletions
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9
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
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@ -2195,11 +2195,11 @@ int vmw_execbuf_process(struct drm_file *file_priv,
ret = vmw_cmd_check_all(dev_priv, sw_context, kernel_commands,
command_size);
if (unlikely(ret != 0))
goto out_err;
goto out_err_nores;
ret = vmw_resources_reserve(sw_context);
if (unlikely(ret != 0))
goto out_err;
goto out_err_nores;
ret = ttm_eu_reserve_buffers(&ticket, &sw_context->validate_nodes);
if (unlikely(ret != 0))
@ -2291,10 +2291,11 @@ int vmw_execbuf_process(struct drm_file *file_priv,
out_unlock_binding:
mutex_unlock(&dev_priv->binding_mutex);
out_err:
ttm_eu_backoff_reservation(&ticket, &sw_context->validate_nodes);
out_err_nores:
vmw_resource_list_unreserve(&sw_context->resource_list, true);
vmw_resource_relocations_free(&sw_context->res_relocations);
vmw_free_relocations(sw_context);
ttm_eu_backoff_reservation(&ticket, &sw_context->validate_nodes);
vmw_resource_list_unreserve(&sw_context->resource_list, true);
vmw_clear_validations(sw_context);
if (unlikely(dev_priv->pinned_bo != NULL &&
!dev_priv->query_cid_valid))