staging: unisys: visorbus: return EAGAIN when empty
It really isn't an error when you call visorchannel_signalremove and there isn't anything in the queue. Just means that the IOSP didn't process anything since the last time you checked. Just inform the caller that it is empty by returning -EAGAIN. Signed-off-by: David Kershner <david.kershner@unisys.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -237,8 +237,9 @@ signalremove_inner(struct visorchannel *channel, u32 queue, void *msg)
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if (error)
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return error;
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/* No signals to remove; have caller try again. */
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if (sig_hdr.head == sig_hdr.tail)
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return -EIO; /* no signals to remove */
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return -EAGAIN;
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sig_hdr.tail = (sig_hdr.tail + 1) % sig_hdr.max_slots;
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