path: root/drivers/s390/cio/qdio_main.c
diff options
authorJulian Wiedmann <jwi@linux.vnet.ibm.com>2018-03-07 14:01:01 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-03-26 16:12:33 +0200
commit0cf1e05157b9e5530dcc3ca9fec9bf617fc93375 (patch)
tree84d7bf1718e23a269638511ef961dc0e8f5bf8c8 /drivers/s390/cio/qdio_main.c
parents390/qdio: simplify math in get_*_buffer_frontier() (diff)
s390/qdio: don't merge ERROR output buffers
On an Output queue, both EMPTY and PENDING buffer states imply that the buffer is ready for completion-processing by the upper-layer drivers. So for a non-QEBSM Output queue, get_buf_states() merges mixed batches of PENDING and EMPTY buffers into one large batch of EMPTY buffers. The upper-layer driver (ie. qeth) later distuingishes PENDING from EMPTY by inspecting the slsb_state for QDIO_OUTBUF_STATE_FLAG_PENDING. But the merge logic in get_buf_states() contains a bug that causes us to erronously also merge ERROR buffers into such a batch of EMPTY buffers (ERROR is 0xaf, EMPTY is 0xa1; so ERROR & EMPTY == EMPTY). Effectively, most outbound ERROR buffers are currently discarded silently and processed as if they had succeeded. Note that this affects _all_ non-QEBSM device types, not just IQD with CQ. Fix it by explicitly spelling out the exact conditions for merging. For extracting the "get initial state" part out of the loop, this relies on the fact that get_buf_states() is never called with a count of 0. The QEBSM path already strictly requires this, and the two callers with variable 'count' make sure of it. Fixes: 104ea556ee7f ("qdio: support asynchronous delivery of storage blocks") Cc: <stable@vger.kernel.org> #v3.2+ Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to '')
1 files changed, 20 insertions, 11 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 6b340e6e29ac..bd26df85f559 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -214,7 +214,10 @@ 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)
@@ -225,17 +228,23 @@ 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;