From: Manikanta Pubbisetty <mpubb...@codeaurora.org>

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 <mpubb...@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/ce.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/ce.c 
b/drivers/net/wireless/ath/ath10k/ce.c
index b9def7b..6efa69e 100644
--- a/drivers/net/wireless/ath/ath10k/ce.c
+++ b/drivers/net/wireless/ath/ath10k/ce.c
@@ -615,7 +615,7 @@ void ath10k_ce_rx_update_write_idx(struct ath10k_ce_pipe 
*pipe, u32 nentries)
        /* 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);
-- 
2.7.4


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