[PATCH] dma-coherent: fix rmem_dma_device_init regression

[Arnd Bergmann]

My recent bug fix introduced another bug, which caused rmem_dma_device_init
to always fail, as rmem->priv is never set to anything.

This restores the previous behavior, calling dma_init_coherent_memory()
whenever ->priv is NULL.

Fixes: d35b0996fef3 ("dma-coherent: fix dma_declare_coherent_memory() logic 
error")
Reported-by: Roy Pledge <roy.ple...@nxp.com>
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
Roy, can you test this new fix?
---
 drivers/base/dma-coherent.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
index a39b2166b145..744f64f43454 100644
--- a/drivers/base/dma-coherent.c
+++ b/drivers/base/dma-coherent.c
@@ -348,16 +348,15 @@ static int rmem_dma_device_init(struct reserved_mem 
*rmem, struct device *dev)
        struct dma_coherent_mem *mem = rmem->priv;
        int ret;
 
-       if (!mem)
-               return -ENODEV;
-
-       ret = dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
-                                      DMA_MEMORY_EXCLUSIVE, &mem);
-
-       if (ret) {
-               pr_err("Reserved memory: failed to init DMA memory pool at %pa, 
size %ld MiB\n",
-                       &rmem->base, (unsigned long)rmem->size / SZ_1M);
-               return ret;
+       if (!mem) {
+               ret = dma_init_coherent_memory(rmem->base, rmem->base,
+                                              rmem->size,
+                                              DMA_MEMORY_EXCLUSIVE, &mem);
+               if (ret) {
+                       pr_err("Reserved memory: failed to init DMA memory pool 
at %pa, size %ld MiB\n",
+                               &rmem->base, (unsigned long)rmem->size / SZ_1M);
+                       return ret;
+               }
        }
        mem->use_dev_dma_pfn_offset = true;
        rmem->priv = mem;
-- 
2.9.0