From 52e2a99eee77cc4a47e183eb7f5102301a31e282 Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Sun, 25 Nov 2012 14:42:25 +0200 Subject: [PATCH] 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 Signed-off-by: Johannes Berg --- drivers/net/wireless/iwlwifi/pcie/rx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c index c81b978..787b9ca 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 */ -- 2.7.4