diff options
Diffstat (limited to 'drivers/s390/cio/qdio_main.c')
-rw-r--r-- | drivers/s390/cio/qdio_main.c | 42 |
1 files changed, 22 insertions, 20 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 848e3b64ea6e..fb7298920c8c 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -126,7 +126,7 @@ static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, int start, int count, int auto_ack) { - int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0; + int rc, tmp_count = count, tmp_start = start, nr = q->nr; unsigned int ccq = 0; qperf_inc(q, eqbs); @@ -149,14 +149,7 @@ again: qperf_inc(q, eqbs_partial); DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x", tmp_count); - /* - * Retry once, if that fails bail out and process the - * extracted buffers before trying again. - */ - if (!retried++) - goto again; - else - return count - tmp_count; + return count - tmp_count; } DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); @@ -212,7 +205,10 @@ again: return 0; } -/* returns number of examined buffers and their common state in *state */ +/* + * Returns number of examined buffers and their common state in *state. + * Requested number of buffers-to-examine must be > 0. + */ static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, unsigned char *state, unsigned int count, int auto_ack, int merge_pending) @@ -223,17 +219,23 @@ static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, if (is_qebsm(q)) return qdio_do_eqbs(q, state, bufnr, count, auto_ack); - for (i = 0; i < count; i++) { - if (!__state) { - __state = q->slsb.val[bufnr]; - if (merge_pending && __state == SLSB_P_OUTPUT_PENDING) - __state = SLSB_P_OUTPUT_EMPTY; - } else if (merge_pending) { - if ((q->slsb.val[bufnr] & __state) != __state) - break; - } else if (q->slsb.val[bufnr] != __state) - break; + /* get initial state: */ + __state = q->slsb.val[bufnr]; + if (merge_pending && __state == SLSB_P_OUTPUT_PENDING) + __state = SLSB_P_OUTPUT_EMPTY; + + for (i = 1; i < count; i++) { bufnr = next_buf(bufnr); + + /* merge PENDING into EMPTY: */ + if (merge_pending && + q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING && + __state == SLSB_P_OUTPUT_EMPTY) + continue; + + /* stop if next state differs from initial state: */ + if (q->slsb.val[bufnr] != __state) + break; } *state = __state; return i; |