[Mesa-stable] [PATCH v2 4/4] gallium/winsys/kms: Look up the GEM handle after importing a prime FD (v2)

[Tomasz Figa]

drmPrimeHandleToFD() will return the same GEM handle every time the same
buffer is imported, even from a different prime FD. Since GEM handles
are not reference counted, we need to make sure that each GEM handle is
referenced only by one display target struct, by looking it up in
kms_sw->bo_list first and bumping the refcount of the found dt on hit
and falling back to creating a new dt only on miss.

v2: Split into separate function.
    Use helper function for lookup.

Signed-off-by: Tomasz Figa <tfiga at chromium.org>
CC: <mesa-stable at lists.freedesktop.org>
---
 src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c b/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c
index cb02b22..4ee2696 100644
--- a/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c
+++ b/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c
@@ -244,6 +244,10 @@ kms_sw_displaytarget_add_from_prime(struct kms_sw_winsys *kms_sw, int fd,
    if (ret)
       return NULL;
 
+   kms_sw_dt = kms_sw_displaytarget_lookup(kms_sw, handle);
+   if (kms_sw_dt)
+      return kms_sw_dt;
+
    kms_sw_dt = CALLOC_STRUCT(kms_sw_displaytarget);
    if (!kms_sw_dt)
       return NULL;
-- 
2.8.0.rc3.226.g39d4020