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iwlwifi: read the Rx write pointer only once

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The FH (DMA engine) tells the driver the index of the last
ready (closed) Rx buffer. This data is in closed_rb_num.
If we read this data several times we may get inconsistencies
between the code and the debug prints which can make it
harder to debug issues here.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Emmanuel Grumbach 2012-11-25 14:42:25 +02:00 • committed by Johannes Berg
commit 52e2a99eee
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/iwlwifi/pcie/rx.c
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@ -698,7 +698,7 @@ static void iwl_pcie_rx_handle(struct iwl_trans *trans)
/* uCode's read index (stored in shared DRAM) indicates the last Rx
* buffer that the driver may process (last buffer filled by ucode). */
r = le16_to_cpu(rxq->rb_stts->closed_rb_num) & 0x0FFF;
r = le16_to_cpu(ACCESS_ONCE(rxq->rb_stts->closed_rb_num)) & 0x0FFF;
i = rxq->read;
/* Rx interrupt, but nothing sent from uCode */