Messages in this thread Patch in this message | | | From | Ohad Ben-Cohen <> | Subject | [PATCH 3/7] remoteproc: safer boot/shutdown order | Date | Thu, 1 Mar 2012 10:11:33 +0200 |
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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> --- 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 4f73e81..78d8527 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: -- 1.7.5.4
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