[PATCH V5 03/12] mailbox: Fix up error handling in mbox_request_channel()
From: Andrew Bresticker <hidden>
Date: 2014-11-17 22:51:18
Also in:
linux-arm-kernel, linux-tegra, lkml
Subsystem:
mailbox api, the rest · Maintainers:
Jassi Brar, Linus Torvalds
From: Benson Leung <redacted> 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 <redacted> Signed-off-by: Andrew Bresticker <redacted> --- New for v5. --- drivers/mailbox/mailbox.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index c281e55..7b1e258 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]; }
--
2.1.0.rc2.206.gedb03e5
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