linux-kernel - [PATCH 5.13 122/223] drm/ttm: Force re-init if ttm_global

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Message-Id: <20210726153850.265079510@linuxfoundation.org>
Date:   Mon, 26 Jul 2021 17:38:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jason Ekstrand <jason@...kstrand.net>,
        Christian König <christian.koenig@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 122/223] drm/ttm: Force re-init if ttm_global_init() fails

From: Jason Ekstrand <jason@...kstrand.net>

[ Upstream commit 235c3610d5f02ee91244239b43cd9ae8b4859dff ]

If we have a failure, decrement the reference count so that the next
call to ttm_global_init() will actually do something instead of assume
everything is all set up.

Signed-off-by: Jason Ekstrand <jason@...kstrand.net>
Fixes: 62b53b37e4b1 ("drm/ttm: use a static ttm_bo_global instance")
Reviewed-by: Christian König <christian.koenig@....com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210720181357.2760720-5-jason@jlekstrand.net
Signed-off-by: Christian König <christian.koenig@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/ttm/ttm_device.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index 3d9c62b93e29..ef6e0c042bb1 100644
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -100,6 +100,8 @@ static int ttm_global_init(void)
 	debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
 				&glob->bo_count);
 out:
+	if (ret)
+		--ttm_glob_use_count;
 	mutex_unlock(&ttm_global_mutex);
 	return ret;
 }
-- 
2.30.2