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mailbox: Fix up error handling in mbox_request_channel() 

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@chromium.org>
Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Acked-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Benson Leung 2015-05-04 10:36:36 -07:00 committed by Jassi Brar
parent 05ae797566
commit 2d805fc1c6
2 changed files with 11 additions and 6 deletions
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11
drivers/mailbox/mailbox.c
View File

@ -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];
}

6
drivers/mailbox/omap-mailbox.c
View File

@ -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)