linux-kernel - [PATCH] drm/vmwgfx: replace idr_init() by idr_init

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Message-ID: <20201105190718.GA89863@localhost>
Date:   Fri, 6 Nov 2020 00:37:18 +0530
From:   Deepak R Varma <mh12gx2825@...il.com>
To:     VMware Graphics <linux-graphics-maintainer@...are.com>,
        Roland Scheidegger <sroland@...are.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     mh12gx2825@...il.com
Subject: [PATCH] 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@...il.com>
---
 drivers/gpu/drm/vmwgfx/ttm_object.c | 2 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/ttm_object.c b/drivers/gpu/drm/vmwgfx/ttm_object.c
index 16077785ad47..cbedcb043803 100644
--- 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 31e3e5c9f362..a24d9363a17e 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -675,7 +675,7 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 	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]);
 	}
 
-- 
2.25.1