linux-kernel - [PATCH net-next 3/5] net: ipa: don't retry in ipa_endpoint

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Date:   Mon,  4 May 2020 18:53:43 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net
Cc:     evgreen@...omium.org, subashab@...eaurora.org,
        cpratapa@...eaurora.org, bjorn.andersson@...aro.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 3/5] net: ipa: don't retry in ipa_endpoint_stop()

The only reason ipa_endpoint_stop() had a retry loop was that the
just-removed workaround required an IPA DMA command to occur between
attempts.  The gsi_channel_stop() call that implements the stop does
its own retry loop, to cover a channel's transition from started to
stop-in-progress to stopped state.

Get rid of the unnecessary retry loop in ipa_endpoint_stop().

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index c20a5a32fbaa..4939fdd3fca0 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -32,8 +32,6 @@
 /* The amount of RX buffer space consumed by standard skb overhead */
 #define IPA_RX_BUFFER_OVERHEAD	(PAGE_SIZE - SKB_MAX_ORDER(NET_SKB_PAD, 0))
 
-#define IPA_ENDPOINT_STOP_RX_RETRIES		10
-
 #define IPA_ENDPOINT_RESET_AGGR_RETRY_MAX	3
 #define IPA_AGGR_TIME_LIMIT_DEFAULT		1000	/* microseconds */
 
@@ -1254,20 +1252,9 @@ static void ipa_endpoint_reset(struct ipa_endpoint *endpoint)
  */
 int ipa_endpoint_stop(struct ipa_endpoint *endpoint)
 {
-	u32 retries = IPA_ENDPOINT_STOP_RX_RETRIES;
-	int ret;
+	struct gsi *gsi = &endpoint->ipa->gsi;
 
-	do {
-		struct gsi *gsi = &endpoint->ipa->gsi;
-
-		ret = gsi_channel_stop(gsi, endpoint->channel_id);
-		if (ret != -EAGAIN || endpoint->toward_ipa)
-			break;
-
-		msleep(1);
-	} while (retries--);
-
-	return retries ? ret : -EIO;
+	return gsi_channel_stop(gsi, endpoint->channel_id);
 }
 
 static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
-- 
2.20.1