ath6kl: Avoid rolling back of entire scatter setup in case of failure

Current tx scatter gather implementation rolls back the entire
scatter setup in case of a failure in setting up just one packet
into the bundle. Instead of dopping the whole scatter setup,
send the packets available just before the failure one using
scatter gather I/O.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath6kl/htc.c b/drivers/net/wireless/ath/ath6kl/htc.c
index dc575a8..77e548c 100644 (file)
--- a/drivers/net/wireless/ath/ath6kl/htc.c
+++ b/drivers/net/wireless/ath/ath6kl/htc.c
@@ -381,13 +381,7 @@ static int htc_setup_send_scat_list(struct htc_target *target,
 
                cred_pad = htc_get_credit_padding(target->tgt_cred_sz,
                                                  &len, endpoint);
-               if (cred_pad < 0) {
-                       status = -EINVAL;
-                       break;
-               }
-
-               if (rem_scat < len) {
-                       /* exceeds what we can transfer */
+               if (cred_pad < 0 || rem_scat < len) {
                        status = -ENOSPC;
                        break;
                }
@@ -416,7 +410,7 @@ static int htc_setup_send_scat_list(struct htc_target *target,
        }
 
        /* Roll back scatter setup in case of any failure */
-       if (status || (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE)) {
+       if (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE) {
                for (i = scat_req->scat_entries - 1; i >= 0; i--) {
                        packet = scat_req->scat_list[i].packet;
                        if (packet) {
@@ -424,10 +418,10 @@ static int htc_setup_send_scat_list(struct htc_target *target,
                                list_add(&packet->list, queue);
                        }
                }
-               return -EINVAL;
+               return -EAGAIN;
        }
 
-       return 0;
+       return status;
 }
 
 /*
@@ -447,8 +441,10 @@ static void htc_issue_send_bundle(struct htc_endpoint *endpoint,
        struct htc_target *target = endpoint->target;
        struct hif_scatter_req *scat_req = NULL;
        int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0;
+       int status;
 
        while (true) {
+               status = 0;
                n_scat = get_queue_depth(queue);
                n_scat = min(n_scat, target->msg_per_bndl_max);
 
@@ -471,8 +467,9 @@ static void htc_issue_send_bundle(struct htc_endpoint *endpoint,
                scat_req->len = 0;
                scat_req->scat_entries = 0;
 
-               if (htc_setup_send_scat_list(target, endpoint, scat_req,
-                                            n_scat, queue)) {
+               status = htc_setup_send_scat_list(target, endpoint,
+                                                 scat_req, n_scat, queue);
+               if (status == -EAGAIN) {
                        hif_scatter_req_add(target->dev->ar, scat_req);
                        break;
                }
@@ -486,6 +483,9 @@ static void htc_issue_send_bundle(struct htc_endpoint *endpoint,
                           "send scatter total bytes: %d , entries: %d\n",
                           scat_req->len, scat_req->scat_entries);
                ath6kldev_submit_scat_req(target->dev, scat_req, false);
+
+               if (status)
+                       break;
        }
 
        *sent_bundle = n_sent_bundle;