net/sfc: handle already flushed Tx queue gracefully

Tx queue may be already flushed because of previous Tx error or
MC reboot.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>

diff --git a/drivers/net/sfc/sfc_tx.c b/drivers/net/sfc/sfc_tx.c
index 9e426ca..fc439cb 100644 (file)
--- a/drivers/net/sfc/sfc_tx.c
+++ b/drivers/net/sfc/sfc_tx.c
@@ -479,6 +479,7 @@ sfc_tx_qstop(struct sfc_adapter *sa, unsigned int sw_index)
        struct sfc_txq *txq;
        unsigned int retry_count;
        unsigned int wait_count;
+       int rc;
 
        sfc_log_init(sa, "TxQ = %u", sw_index);
 
@@ -502,8 +503,10 @@ sfc_tx_qstop(struct sfc_adapter *sa, unsigned int sw_index)
             ((txq->state & SFC_TXQ_FLUSHED) == 0) &&
             (retry_count < SFC_TX_QFLUSH_ATTEMPTS);
             ++retry_count) {
-               if (efx_tx_qflush(txq->common) != 0) {
-                       txq->state |= SFC_TXQ_FLUSH_FAILED;
+               rc = efx_tx_qflush(txq->common);
+               if (rc != 0) {
+                       txq->state |= (rc == EALREADY) ?
+                               SFC_TXQ_FLUSHED : SFC_TXQ_FLUSH_FAILED;
                        break;
                }