drm/vmwgfx: replace idr_init() by idr_init_base()

idr_init() uses base 0 which is an invalid identifier for this driver.
The idr_alloc for this driver uses 1 as start value for ID range. The
new function idr_init_base allows IDR to set the ID lookup from base 1.
This avoids all lookups that otherwise starts from 0 since 0 is always
unused / available.

References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient")

Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201105190718.GA89863@localhost

diff --git a/drivers/gpu/drm/vmwgfx/ttm_object.c b/drivers/gpu/drm/vmwgfx/ttm_object.c
index 112394d..04789b2 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/ttm_object.c
+++ b/drivers/gpu/drm/vmwgfx/ttm_object.c
@@ -540,7 +540,7 @@ ttm_object_device_init(struct ttm_mem_global *mem_glob,
        if (ret != 0)
                goto out_no_object_hash;
 
-       idr_init(&tdev->idr);
+       idr_init_base(&tdev->idr, 1);
        tdev->ops = *ops;
        tdev->dmabuf_release = tdev->ops.release;
        tdev->ops.release = ttm_prime_dmabuf_release;

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 997dadc..e9ea971 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -725,7 +725,7 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
        spin_lock_init(&dev_priv->cursor_lock);
 
        for (i = vmw_res_context; i < vmw_res_max; ++i) {
-               idr_init(&dev_priv->res_idr[i]);
+               idr_init_base(&dev_priv->res_idr[i], 1);
                INIT_LIST_HEAD(&dev_priv->res_lru[i]);
        }