From 1e8f77502341035f079039c9aa9a647ebc9d881a Mon Sep 17 00:00:00 2001
From: Manikanta Pubbisetty <mpubbise@codeaurora.org>
Date: Thu, 12 Apr 2018 17:46:50 +0530
Subject: [PATCH] ath10k: correct target assert problem due to CE5 stuck
Git-commit: 1e8f77502341035f079039c9aa9a647ebc9d881a
Patch-mainline: v4.18-rc1
References: bsc#1051510

Correct a minor bug in the commit 0628467f97b5 ("ath10k: fix
copy engine 5 destination ring stuck") which introduced a change to fix
firmware assert that happens when ring indices of copy engine 5 are stuck
for a specific duration, problem with this fix is that it did not use
ring arithmatic. As a result,firmware asserts did not go away entirely
athough the frequency of occurrence has reduced. Using ring arithmatic
to fix the issue.

Tested on QCA9984(fw version-10.4-3.4-00082).

Fixes: 0628467f97b5 ("ath10k: fix copy engine 5 destination ring stuck)
Signed-off-by: Manikanta Pubbisetty <mpubbise@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/ath/ath10k/ce.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/ath10k/ce.c
+++ b/drivers/net/wireless/ath/ath10k/ce.c
@@ -437,7 +437,7 @@ void ath10k_ce_rx_update_write_idx(struc
 	/* Prevent CE ring stuck issue that will occur when ring is full.
 	 * Make sure that write index is 1 less than read index.
 	 */
-	if ((cur_write_idx + nentries)  == dest_ring->sw_index)
+	if (((cur_write_idx + nentries) & nentries_mask) == dest_ring->sw_index)
 		nentries -= 1;
 
 	write_index = CE_RING_IDX_ADD(nentries_mask, write_index, nentries);