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| author | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2019-11-14 11:03:43 +0300 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2019-12-04 20:11:28 +0300 |
| commit | d9c148cfaf0a99296ad7c92fb8b65952196053ec (patch) | |
| tree | 16c52ad673b2b2c92e08ada351c5d2ea79794e76 /drivers/gpu | |
| parent | d6d07ca19c045924f2b9cac14cb277cc34f85d43 (diff) | |
| download | linux-d9c148cfaf0a99296ad7c92fb8b65952196053ec.tar.xz | |
drm/omap: fix dma_addr refcounting
cec4fa7511ef7a73eb635834e9d85b25a5b47a98 ("drm/omap: use refcount API to
track the number of users of dma_addr") changed omap_gem.c to use
refcounting API to track dma_addr uses. However, the driver only tracks
the refcounts for non-contiguous buffers, and the patch didn't fully
take this in account.
After the patch, the driver always decreased refcount in omap_gem_unpin,
instead of decreasing the refcount only for non-contiguous buffers. This
leads to refcounting mismatch.
As for the contiguous cases the refcount is never increased, fix this
issue by returning from omap_gem_unpin if the buffer being unpinned is
contiguous.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191114080343.30704-1-tomi.valkeinen@ti.com
Fixes: cec4fa7511ef ("drm/omap: use refcount API to track the number of users of dma_addr")
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/omap_gem.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c index e518d93ca6df..d08ae95ecc0a 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem.c +++ b/drivers/gpu/drm/omapdrm/omap_gem.c @@ -843,9 +843,13 @@ fail: */ static void omap_gem_unpin_locked(struct drm_gem_object *obj) { + struct omap_drm_private *priv = obj->dev->dev_private; struct omap_gem_object *omap_obj = to_omap_bo(obj); int ret; + if (omap_gem_is_contiguous(omap_obj) || !priv->has_dmm) + return; + if (refcount_dec_and_test(&omap_obj->dma_addr_cnt)) { ret = tiler_unpin(omap_obj->block); if (ret) { |