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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Deepak R Varma <mh12gx2825@gmail.com>,
        Thierry Reding <treding@nvidia.com>,
        Sasha Levin <sashal@kernel.org>,
        dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org
Subject: [PATCH AUTOSEL 5.9 03/23] drm/tegra: replace idr_init() by idr_init_base()
Date:   Sat, 12 Dec 2020 11:07:44 -0500
Message-Id: <20201212160804.2334982-3-sashal@kernel.org>
In-Reply-To: <20201212160804.2334982-1-sashal@kernel.org>
References: <20201212160804.2334982-1-sashal@kernel.org>
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From: Deepak R Varma <mh12gx2825@gmail.com>

[ Upstream commit 41f71629b4c432f8dd47d70ace813be5f79d4d75 ]

idr_init() uses base 0 which is an invalid identifier for this driver.
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.

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

Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/tegra/drm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index ba9d1c3e7cacf..e4baf07992a4d 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -90,7 +90,7 @@ static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
 	if (!fpriv)
 		return -ENOMEM;
 
-	idr_init(&fpriv->contexts);
+	idr_init_base(&fpriv->contexts, 1);
 	mutex_init(&fpriv->lock);
 	filp->driver_priv = fpriv;
 
-- 
2.27.0