linux-kernel - [PATCH 0/2] mailbox: Fix error handling in mbox_send

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Date:   Thu, 15 Sep 2022 19:47:28 +0300
From:   Evgenii Shatokhin <e.shatokhin@...ro.com>
To:     Jassi Brar <jassisinghbrar@...il.com>
CC:     <linux-kernel@...r.kernel.org>, Ilya Kuznetsov <ilya@...ro.com>,
        <linux@...ro.com>, Evgenii Shatokhin <e.shatokhin@...ro.com>
Subject: [PATCH 0/2] mailbox: Fix error handling in mbox_send_message()

This series fixes a couple issues I found while experimenting with mailbox device drivers:

1. If one tries to send a message via the mailbox using mbox_send_message(), and the controller driver for the mailbox device returns any error, mbox_send_message() returns -ETIME when in blocking mode. This is confusing at least.

2. If the mbox controller driver fails to send a message, mbox_send_message() needlessly waits for the message to be sent. That ends when the waiting timeout has been expired. However, the pointer to the message remains in the queue of the mbox framework (chan->msg_data) and the framework will try to process it over and over again, when one tries to send other messages. If the driver rejects the message each time because it is invalid (some drivers do that), this will prevent anyone from using that mailbox channel.

Evgenii Shatokhin (2):
  mailbox: Propagate errors from .send_data() callback to
    mbox_send_message()
  mailbox: Error out early if the mbox driver has failed to submit the
    message

 drivers/mailbox/mailbox.c | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

-- 
2.34.1