@@ -64,6 +64,7 @@
struct virtproc_info {
struct virtio_device *vdev;
struct virtqueue *rvq, *svq;
+ struct device *bufs_dev;
void *rbufs, *sbufs;
unsigned int num_bufs;
unsigned int buf_size;
@@ -924,9 +925,16 @@ static int rpmsg_probe(struct virtio_device *vdev)
total_buf_space, &vrp->bufs_dma,
GFP_KERNEL);
if (!bufs_va) {
- err = -ENOMEM;
- goto vqs_del;
- }
+ bufs_va = dma_alloc_coherent(vdev->dev.parent,
+ total_buf_space, &vrp->bufs_dma,
+ GFP_KERNEL);
+ if (!bufs_va) {
+ err = -ENOMEM;
+ goto vqs_del;
+ } else
+ vrp->bufs_dev = vdev->dev.parent;
+ } else
+ vrp->bufs_dev = vdev->dev.parent->parent;
dev_dbg(&vdev->dev, "buffers: va %p, dma %pad\n",
bufs_va, &vrp->bufs_dma);
@@ -988,7 +996,7 @@ static int rpmsg_probe(struct virtio_device *vdev)
return 0;
free_coherent:
- dma_free_coherent(vdev->dev.parent->parent, total_buf_space,
+ dma_free_coherent(vrp->bufs_dev, total_buf_space,
bufs_va, vrp->bufs_dma);
vqs_del:
vdev->config->del_vqs(vrp->vdev);
@@ -1023,7 +1031,7 @@ static void rpmsg_remove(struct virtio_device *vdev)
vdev->config->del_vqs(vrp->vdev);
- dma_free_coherent(vdev->dev.parent->parent, total_buf_space,
+ dma_free_coherent(vrp->bufs_dev, total_buf_space,
vrp->rbufs, vrp->bufs_dma);
kfree(vrp);
When virtio-rpmsg device is provided via virtio-mmio transport, the dma_alloc_coherent() (called by rpmsg_probe()) fails on ARM/ARM64 systems because "vdev->dev.parent->parent" device is used as parameter to dma_alloc_coherent(). The "vdev->dev.parent->parent" device represents underlying remoteproc platform device when virtio-rpmsg device is provided via virtio-remoteproc transport. When virtio-rpmsg device is provided via virtio-mmio transport, the "vdev->dev.parent->parent" device represents the parent device of virtio-mmio platform device and dma_alloc_coherent() fails for this device because generally there is no corresponding platform device and dma_ops are not setup for "vdev->dev.parent->parent". This patch fixes dma_alloc_coherent() usage in rpmsg_probe() by trying dma_alloc_coherent() with "vdev->dev.parent" device when it fails with "vdev->dev.parent->parent" device. Fixes: b5ab5e24e960 ("remoteproc: maintain a generic child device for each rproc") Signed-off-by: Anup Patel <anup@brainfault.org> Cc: stable@vger.kernel.org --- drivers/rpmsg/virtio_rpmsg_bus.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)