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mailbox: Clarify multi-thread is not supported in blocking mode

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Unlike in non-blocking mode, multi-thread has not been supported in
blocking mode. This commit is to prevent clients from having wrong
assumption by explicitly specifying this fact to the API doc.

Signed-off-by: Joonwon Kang <joonwonkang@google.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
This commit is contained in:
Joonwon Kang 2026-04-21 10:46:51 +00:00 committed by Jassi Brar
parent b57d1a40bc
commit c96c8a7404
1 changed files with 4 additions and 0 deletions
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drivers/mailbox/mailbox.c
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@ -258,6 +258,10 @@ EXPORT_SYMBOL_GPL(mbox_chan_tx_slots_available);
* over the chan, i.e, tx_done() is made.
* This function could be called from atomic context as it simply
* queues the data and returns a token against the request.
* In blocking mode, it is caller's responsibility to serialize threads'
* access to a channel if multi-threads are to send messages through the
* same channel, i.e. caller should not call this function until any
* previous call returns.
*
* Return: Non-negative integer for successful submission (non-blocking mode)
* or transmission over chan (blocking mode).