From: Julian Wiedmann Date: Mon, 3 Jun 2019 05:47:04 +0000 (+0200) Subject: s390/qdio: handle PENDING state for QEBSM devices X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=21f2b10ca6649368527e54a1a77713d1cf822d08;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git s390/qdio: handle PENDING state for QEBSM devices [ Upstream commit 04310324c6f482921c071444833e70fe861b73d9 ] When a CQ-enabled device uses QEBSM for SBAL state inspection, get_buf_states() can return the PENDING state for an Output Queue. get_outbound_buffer_frontier() isn't prepared for this, and any PENDING buffer will permanently stall all further completion processing on this Queue. This isn't a concern for non-QEBSM devices, as get_buf_states() for such devices will manually turn PENDING buffers into EMPTY ones. Fixes: 104ea556ee7f ("qdio: support asynchronous delivery of storage blocks") Signed-off-by: Julian Wiedmann Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin --- diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index c7afdbded26b..ab8dd81fbc2b 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -759,6 +759,7 @@ static int get_outbound_buffer_frontier(struct qdio_q *q) switch (state) { case SLSB_P_OUTPUT_EMPTY: + case SLSB_P_OUTPUT_PENDING: /* the adapter got it */ DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);