diff options
| author |   Benson Leung <bleung@chromium.org> | 2015-05-04 10:36:36 -0700 |
|---|---|---|
| committer |   Jassi Brar <jaswinder.singh@linaro.org> | 2015-05-12 09:18:21 +0530 |
| commit | 2d805fc1c6b2ec09f27bcd951c2aee3da919f81a (patch) | |
| tree | 295523b6586a470b8b01e91929b531cf3c0e0af4 /drivers/mailbox/mailbox.c | |
| parent | mailbox: Make mbox_chan_ops const (diff) | |
| download | linux-dev-2d805fc1c6b2ec09f27bcd951c2aee3da919f81a.tar.xz linux-dev-2d805fc1c6b2ec09f27bcd951c2aee3da919f81a.zip | |
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>
Diffstat (limited to 'drivers/mailbox/mailbox.c')
| -rw-r--r-- | drivers/mailbox/mailbox.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 19b491d2964f..c3c42d42d017 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]; } |