net: ipa: increment backlog in replenish caller

Three spots call ipa_endpoint_replenish(), and just one of those
requests that the backlog be incremented after completing the
replenish operation.

Instead, have the caller increment the backlog, and get rid of the
add_one argument to ipa_endpoint_replenish().

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index f8dbd43..060a025 100644 (file)
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1084,7 +1084,6 @@ err_trans_free:
 /**
  * ipa_endpoint_replenish() - Replenish endpoint receive buffers
  * @endpoint:  Endpoint to be replenished
- * @add_one:   Whether this is replacing a just-consumed buffer
  *
  * The IPA hardware can hold a fixed number of receive buffers for an RX
  * endpoint, based on the number of entries in the underlying channel ring
@@ -1093,24 +1092,17 @@ err_trans_free:
  * an endpoint can be disabled, in which case buffers are not queued to
  * the hardware.
  */
-static void ipa_endpoint_replenish(struct ipa_endpoint *endpoint, bool add_one)
+static void ipa_endpoint_replenish(struct ipa_endpoint *endpoint)
 {
        struct gsi *gsi;
        u32 backlog;
-       int delta;
 
-       if (!test_bit(IPA_REPLENISH_ENABLED, endpoint->replenish_flags)) {
-               if (add_one)
-                       atomic_inc(&endpoint->replenish_backlog);
+       if (!test_bit(IPA_REPLENISH_ENABLED, endpoint->replenish_flags))
                return;
-       }
 
-       /* If already active, just update the backlog */
-       if (test_and_set_bit(IPA_REPLENISH_ACTIVE, endpoint->replenish_flags)) {
-               if (add_one)
-                       atomic_inc(&endpoint->replenish_backlog);
+       /* Skip it if it's already active */
+       if (test_and_set_bit(IPA_REPLENISH_ACTIVE, endpoint->replenish_flags))
                return;
-       }
 
        while (atomic_dec_not_zero(&endpoint->replenish_backlog))
                if (ipa_endpoint_replenish_one(endpoint))
@@ -1118,17 +1110,13 @@ static void ipa_endpoint_replenish(struct ipa_endpoint *endpoint, bool add_one)
 
        clear_bit(IPA_REPLENISH_ACTIVE, endpoint->replenish_flags);
 
-       if (add_one)
-               atomic_inc(&endpoint->replenish_backlog);
-
        return;
 
 try_again_later:
        clear_bit(IPA_REPLENISH_ACTIVE, endpoint->replenish_flags);
 
        /* The last one didn't succeed, so fix the backlog */
-       delta = add_one ? 2 : 1;
-       backlog = atomic_add_return(delta, &endpoint->replenish_backlog);
+       backlog = atomic_inc_return(&endpoint->replenish_backlog);
 
        /* Whenever a receive buffer transaction completes we'll try to
         * replenish again.  It's unlikely, but if we fail to supply even
@@ -1152,7 +1140,7 @@ static void ipa_endpoint_replenish_enable(struct ipa_endpoint *endpoint)
        /* Start replenishing if hardware currently has no buffers */
        max_backlog = gsi_channel_tre_max(gsi, endpoint->channel_id);
        if (atomic_read(&endpoint->replenish_backlog) == max_backlog)
-               ipa_endpoint_replenish(endpoint, false);
+               ipa_endpoint_replenish(endpoint);
 }
 
 static void ipa_endpoint_replenish_disable(struct ipa_endpoint *endpoint)
@@ -1167,7 +1155,7 @@ static void ipa_endpoint_replenish_work(struct work_struct *work)
 
        endpoint = container_of(dwork, struct ipa_endpoint, replenish_work);
 
-       ipa_endpoint_replenish(endpoint, false);
+       ipa_endpoint_replenish(endpoint);
 }
 
 static void ipa_endpoint_skb_copy(struct ipa_endpoint *endpoint,
@@ -1372,7 +1360,8 @@ static void ipa_endpoint_rx_complete(struct ipa_endpoint *endpoint,
 {
        struct page *page;
 
-       ipa_endpoint_replenish(endpoint, true);
+       ipa_endpoint_replenish(endpoint);
+       atomic_inc(&endpoint->replenish_backlog);
 
        if (trans->cancelled)
                return;