On 04/27/2015 05:37 PM, Andrew Bresticker wrote:
> From: Benson Leung <bleung@xxxxxxxxxxxx>
>
> mbox_request_channel() currently returns EBUSY in the event the controller
> is not present or if of_xlate() fails, but in neither case is EBUSY really
> appropriate. Return EPROBE_DEFER if the controller is not yet present
> and change of_xlate() to return an ERR_PTR instead of NULL so that the
> error can be propagated back to the caller of mbox_request_channel().
>
> Signed-off-by: Benson Leung <bleung@xxxxxxxxxxxx>
> Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
> Cc: Jassi Brar <jassisinghbrar@xxxxxxxxx>
> Cc: Suman Anna <s-anna@xxxxxx>
> ---
> Changes from v6:
> - Update omap-mailbox's xlate() to return error codes.
> No changes from v5.
> New for v5.
> ---
> drivers/mailbox/mailbox.c | 11 ++++++++---
> drivers/mailbox/omap-mailbox.c | 6 +++---
For the OMAP mailbox portion,
Acked-by: Suman Anna <s-anna@xxxxxx>
> 2 files changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
> index 19b491d..c3c42d4 100644
> --- a/drivers/mailbox/mailbox.c
> +++ b/drivers/mailbox/mailbox.c
> @@ -318,7 +318,7 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index)
> return ERR_PTR(-ENODEV);
> }
>
> - chan = NULL;
> + chan = ERR_PTR(-EPROBE_DEFER);
> list_for_each_entry(mbox, &mbox_cons, node)
> if (mbox->dev->of_node == spec.np) {
> chan = mbox->of_xlate(mbox, &spec);
> @@ -327,7 +327,12 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index)
>
> of_node_put(spec.np);
>
> - if (!chan || chan->cl || !try_module_get(mbox->dev->driver->owner)) {
> + if (IS_ERR(chan)) {
> + mutex_unlock(&con_mutex);
> + return chan;
> + }
> +
> + if (chan->cl || !try_module_get(mbox->dev->driver->owner)) {
> dev_dbg(dev, "%s: mailbox not free\n", __func__);
> mutex_unlock(&con_mutex);
> return ERR_PTR(-EBUSY);
> @@ -390,7 +395,7 @@ of_mbox_index_xlate(struct mbox_controller *mbox,
> int ind = sp->args[0];
>
> if (ind >= mbox->num_chans)
> - return NULL;
> + return ERR_PTR(-EINVAL);
>
> return &mbox->chans[ind];
> }
> diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c
> index 0f332c1..e0df27b 100644
> --- a/drivers/mailbox/omap-mailbox.c
> +++ b/drivers/mailbox/omap-mailbox.c
> @@ -639,18 +639,18 @@ static struct mbox_chan *omap_mbox_of_xlate(struct mbox_controller *controller,
>
> mdev = container_of(controller, struct omap_mbox_device, controller);
> if (WARN_ON(!mdev))
> - return NULL;
> + return ERR_PTR(-EINVAL);
>
> node = of_find_node_by_phandle(phandle);
> if (!node) {
> pr_err("%s: could not find node phandle 0x%x\n",
> __func__, phandle);
> - return NULL;
> + return ERR_PTR(-ENODEV);
> }
>
> mbox = omap_mbox_device_find(mdev, node->name);
> of_node_put(node);
> - return mbox ? mbox->chan : NULL;
> + return mbox ? mbox->chan : ERR_PTR(-ENOENT);
> }
>
> static int omap_mbox_probe(struct platform_device *pdev)
>
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