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ath10k: correct target assert problem due to CE5 stuck 

Correct a minor bug in the commit 0628467f97 ("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: 0628467f97 ("ath10k: fix copy engine 5 destination ring stuck)
Signed-off-by: Manikanta Pubbisetty <mpubbise@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Manikanta Pubbisetty 2018-04-12 17:46:50 +05:30 committed by Kalle Valo
parent 5072d87426
commit 1e8f775023
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/ath/ath10k/ce.c
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@ -620,7 +620,7 @@ 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);