diff options
| author | Ohad Ben-Cohen <[email protected]> | 2012-02-13 09:38:23 +0200 |
|---|---|---|
| committer | Ohad Ben-Cohen <[email protected]> | 2012-03-06 19:13:53 +0200 |
| commit | 41a6ee09ee8dd7ac3a6ac12a24e26279b5d93385 (patch) | |
| tree | 4bc89b62b0076ab23a848a5035bad0c4d524d816 | |
| parent | 04a9016e82193cfbe2f9111b4c59de5628fbbe3b (diff) | |
remoteproc: safer boot/shutdown order
Boot the remote processor only after setting up the virtqueues,
and shut it down before deleting them.
Remote processors should obey virtio status changes, and
therefore not manipulate/trigger the virtqueues while the virtio
driver isn't ready, but it's just safer not to rely on that
(plus a vq access might already be inflight while a vdev
status is changed).
We also don't have yet status change notifications, but that's
a temporary limitation.
Signed-off-by: Ohad Ben-Cohen <[email protected]>
Cc: Brian Swetland <[email protected]>
Cc: Iliyan Malchev <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Mark Grosen <[email protected]>
Cc: John Williams <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Loic PALLARDY <[email protected]>
Cc: Ludovic BARRE <[email protected]>
Cc: Omar Ramirez Luna <[email protected]>
Cc: Guzman Lugo Fernando <[email protected]>
Cc: Anna Suman <[email protected]>
Cc: Clark Rob <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Saravana Kannan <[email protected]>
Cc: David Brown <[email protected]>
Cc: Kieran Bingham <[email protected]>
Cc: Tony Lindgren <[email protected]>
| -rw-r--r-- | drivers/remoteproc/remoteproc_virtio.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c index 4f73e811bb80..78d8527a8fec 100644 --- a/drivers/remoteproc/remoteproc_virtio.c +++ b/drivers/remoteproc/remoteproc_virtio.c @@ -123,14 +123,14 @@ static void rproc_virtio_del_vqs(struct virtio_device *vdev) struct virtqueue *vq, *n; struct rproc *rproc = vdev_to_rproc(vdev); + /* power down the remote processor before deleting vqs */ + rproc_shutdown(rproc); + list_for_each_entry_safe(vq, n, &vdev->vqs, list) { struct rproc_virtio_vq_info *rpvq = vq->priv; vring_del_virtqueue(vq); kfree(rpvq); } - - /* power down the remote processor */ - rproc_shutdown(rproc); } static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs, @@ -145,13 +145,6 @@ static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs, if (nvqs != 2) return -EINVAL; - /* boot the remote processor */ - ret = rproc_boot(rproc); - if (ret) { - dev_err(rproc->dev, "rproc_boot() failed %d\n", ret); - goto error; - } - for (i = 0; i < nvqs; ++i) { vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i]); if (IS_ERR(vqs[i])) { @@ -160,6 +153,13 @@ static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs, } } + /* now that the vqs are all set, boot the remote processor */ + ret = rproc_boot(rproc); + if (ret) { + dev_err(rproc->dev, "rproc_boot() failed %d\n", ret); + goto error; + } + return 0; error: |