A transmit FIFO can never be full, because the mailbox framework
waits until mbox->ops->last_tx_done() succeeds before sending the next
message. sun6i_msgbox_last_tx_done() ensures that the FIFO is empty.

Since the extra check here is unnecessary, remove it.

Signed-off-by: Samuel Holland <sam...@sholland.org>
 drivers/mailbox/sun6i-msgbox.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/mailbox/sun6i-msgbox.c b/drivers/mailbox/sun6i-msgbox.c
index 15d6fd522dc5..ccecf2e5941d 100644
--- a/drivers/mailbox/sun6i-msgbox.c
+++ b/drivers/mailbox/sun6i-msgbox.c
@@ -106,12 +106,6 @@ static int sun6i_msgbox_send_data(struct mbox_chan *chan, 
void *data)
        if (WARN_ON_ONCE(!(readl(mbox->regs + CTRL_REG(n)) & CTRL_TX(n))))
                return 0;
-       /* We cannot post a new message if the FIFO is full. */
-       if (readl(mbox->regs + FIFO_STAT_REG(n)) & FIFO_STAT_MASK) {
-               mbox_dbg(mbox, "Channel %d busy sending 0x%08x\n", n, msg);
-               return -EBUSY;
-       }
        writel(msg, mbox->regs + MSG_DATA_REG(n));
        mbox_dbg(mbox, "Channel %d sent 0x%08x\n", n, msg);

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