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authorOhad Ben-Cohen <ohad@wizery.com>2012-02-13 11:38:23 +0400
committerOhad Ben-Cohen <ohad@wizery.com>2012-03-06 21:13:53 +0400
commit41a6ee09ee8dd7ac3a6ac12a24e26279b5d93385 (patch)
tree4bc89b62b0076ab23a848a5035bad0c4d524d816 /drivers/remoteproc
parent04a9016e82193cfbe2f9111b4c59de5628fbbe3b (diff)
downloadlinux-41a6ee09ee8dd7ac3a6ac12a24e26279b5d93385.tar.xz
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 <ohad@wizery.com> Cc: Brian Swetland <swetland@google.com> Cc: Iliyan Malchev <malchev@google.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Mark Grosen <mgrosen@ti.com> Cc: John Williams <john.williams@petalogix.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Loic PALLARDY <loic.pallardy@stericsson.com> Cc: Ludovic BARRE <ludovic.barre@stericsson.com> Cc: Omar Ramirez Luna <omar.luna@linaro.org> Cc: Guzman Lugo Fernando <fernando.lugo@ti.com> Cc: Anna Suman <s-anna@ti.com> Cc: Clark Rob <rob@ti.com> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Saravana Kannan <skannan@codeaurora.org> Cc: David Brown <davidb@codeaurora.org> Cc: Kieran Bingham <kieranbingham@gmail.com> Cc: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/remoteproc_virtio.c20
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: