From: Ping-Ke Shih <pkshih@xxxxxxxxxxx> [ Upstream commit 94298477f81a1701fc4e1b5a0ce9672acab5dcb2 ] Read 32 bits RX info to a local variable to fix race condition between reading RX length and RX tag. Another solution is to get RX tag at first statement, but adopted solution can save some memory read, and also save 15 bytes binary code. RX tag, a sequence number, is used to ensure that RX data has been DMA to memory completely, so driver must check sequence number is expected before reading other data. This potential problem happens only after enabling 36-bit DMA. Signed-off-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx> Link: https://msgid.link/20240611021901.26394-2-pkshih@xxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/wireless/realtek/rtw89/pci.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw89/pci.c b/drivers/net/wireless/realtek/rtw89/pci.c index 03bbcf9b6737c..1ba812fae12f0 100644 --- a/drivers/net/wireless/realtek/rtw89/pci.c +++ b/drivers/net/wireless/realtek/rtw89/pci.c @@ -183,14 +183,17 @@ static void rtw89_pci_sync_skb_for_device(struct rtw89_dev *rtwdev, static void rtw89_pci_rxbd_info_update(struct rtw89_dev *rtwdev, struct sk_buff *skb) { - struct rtw89_pci_rxbd_info *rxbd_info; struct rtw89_pci_rx_info *rx_info = RTW89_PCI_RX_SKB_CB(skb); + struct rtw89_pci_rxbd_info *rxbd_info; + __le32 info; rxbd_info = (struct rtw89_pci_rxbd_info *)skb->data; - rx_info->fs = le32_get_bits(rxbd_info->dword, RTW89_PCI_RXBD_FS); - rx_info->ls = le32_get_bits(rxbd_info->dword, RTW89_PCI_RXBD_LS); - rx_info->len = le32_get_bits(rxbd_info->dword, RTW89_PCI_RXBD_WRITE_SIZE); - rx_info->tag = le32_get_bits(rxbd_info->dword, RTW89_PCI_RXBD_TAG); + info = rxbd_info->dword; + + rx_info->fs = le32_get_bits(info, RTW89_PCI_RXBD_FS); + rx_info->ls = le32_get_bits(info, RTW89_PCI_RXBD_LS); + rx_info->len = le32_get_bits(info, RTW89_PCI_RXBD_WRITE_SIZE); + rx_info->tag = le32_get_bits(info, RTW89_PCI_RXBD_TAG); } static int rtw89_pci_validate_rx_tag(struct rtw89_dev *rtwdev, -- 2.43.0
