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s390/qdio: add sanity checks to the fast-requeue path
If the device driver were to send out a full queue's worth of SBALs, current code would end up discovering the last of those SBALs as PRIMED and erroneously skip the SIGA-w. This immediately stalls the queue. Add a check to not attempt fast-requeue in this case. While at it also make sure that the state of the previous SBAL was successfully extracted before inspecting it. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Reviewed-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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1 changed files with 6 additions and 6 deletions
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@ -1558,13 +1558,13 @@ static int handle_outbound(struct qdio_q *q, unsigned int callflags,
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rc = qdio_kick_outbound_q(q, phys_aob);
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} else if (need_siga_sync(q)) {
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rc = qdio_siga_sync_q(q);
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} else if (count < QDIO_MAX_BUFFERS_PER_Q &&
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get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
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state == SLSB_CU_OUTPUT_PRIMED) {
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/* The previous buffer is not processed yet, tack on. */
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qperf_inc(q, fast_requeue);
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} else {
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/* try to fast requeue buffers */
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get_buf_state(q, prev_buf(bufnr), &state, 0);
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if (state != SLSB_CU_OUTPUT_PRIMED)
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rc = qdio_kick_outbound_q(q, 0);
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else
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qperf_inc(q, fast_requeue);
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rc = qdio_kick_outbound_q(q, 0);
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}
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/* in case of SIGA errors we must process the error immediately */
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