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| author | Emmanuel Grumbach <emmanuel.grumbach@intel.com> | 2012-11-25 14:42:25 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2012-11-28 15:34:27 +0100 |
| commit | 52e2a99eee77cc4a47e183eb7f5102301a31e282 (patch) | |
| tree | eaaa0795fee04da8408f4c4220fca378a50cdb23 | |
| parent | eea54c8ec971d4759c541dba351477dafc39ce54 (diff) | |
| download | blackbird-op-linux-52e2a99eee77cc4a47e183eb7f5102301a31e282.tar.gz blackbird-op-linux-52e2a99eee77cc4a47e183eb7f5102301a31e282.zip | |
iwlwifi: read the Rx write pointer only once
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>
| -rw-r--r-- | drivers/net/wireless/iwlwifi/pcie/rx.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c index c81b9782d2a4..787b9ca6af9f 100644 --- a/drivers/net/wireless/iwlwifi/pcie/rx.c +++ b/drivers/net/wireless/iwlwifi/pcie/rx.c @@ -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 */ |
