From 31802ca9c030b8f9a137f32826e9c9a76d0d6e17 Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Fri, 19 Jun 2009 16:14:09 -0700
Subject: fallback to ashmem when pmem is not availlable

---
 modules/gralloc/gralloc.cpp | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

(limited to 'modules/gralloc/gralloc.cpp')

diff --git a/modules/gralloc/gralloc.cpp b/modules/gralloc/gralloc.cpp
index 2cf6e02..ccfe40b 100644
--- a/modules/gralloc/gralloc.cpp
+++ b/modules/gralloc/gralloc.cpp
@@ -217,17 +217,23 @@ static int gralloc_alloc_buffer(alloc_device_t* dev,
     }
 
     if ((flags & private_handle_t::PRIV_FLAGS_USES_PMEM) == 0) {
+try_ashmem:
         fd = ashmem_create_region("Buffer", size);
         if (fd < 0) {
+            LOGE("couldn't create ashmem (%s)", strerror(-errno));
             err = -errno;
         }
     } else {
         private_module_t* m = reinterpret_cast<private_module_t*>(
                 dev->common.module);
-        
+
         pthread_mutex_lock(&m->lock);
-        if (m->pmem_master == -1)
+        if (m->pmem_master == -1) {
             err = init_pmem_area(m);
+            if (err) {
+                m->pmem_master = err;
+            }
+        }
         pthread_mutex_unlock(&m->lock);
         
         if (m->pmem_master >= 0) {
@@ -254,6 +260,15 @@ static int gralloc_alloc_buffer(alloc_device_t* dev,
                 }
                 //LOGD_IF(!err, "allocating pmem size=%d, offset=%d", size, offset);
             }
+        } else {
+            if ((usage & GRALLOC_USAGE_HW_2D) == 0) {
+                // the caller didn't request PMEM, so we can try something else
+                flags &= ~private_handle_t::PRIV_FLAGS_USES_PMEM;
+                err = 0;
+                goto try_ashmem;
+            } else {
+                LOGE("couldn't open pmem (%s)", strerror(-errno));
+            }
         }
     }
 
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