diff options
| author |   Netanel Belgazal <netanel@annapurnalabs.com> | 2017-02-09 15:21:35 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-02-09 22:27:06 -0500 |
| commit | a8496eb81342393e4c8280a5ec27e1872a3fb9fd (patch) | |
| tree | 204e1ce4b2e26fe971a06b11565204cb618b8cbc /drivers/net/ethernet/amazon | |
| parent | net/ena: use napi_complete_done() return value (diff) | |
| download | linux-dev-a8496eb81342393e4c8280a5ec27e1872a3fb9fd.tar.xz linux-dev-a8496eb81342393e4c8280a5ec27e1872a3fb9fd.zip | |
net/ena: use READ_ONCE to access completion descriptors
Completion descriptors are accessed from the driver and from the device.
To avoid reading the old value, use READ_ONCE macro.
Signed-off-by: Netanel Belgazal <netanel@annapurnalabs.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/amazon')
| -rw-r--r-- | drivers/net/ethernet/amazon/ena/ena_com.h | 1 | ||||
| -rw-r--r-- | drivers/net/ethernet/amazon/ena/ena_eth_com.c | 8 |
2 files changed, 5 insertions, 4 deletions
diff --git a/drivers/net/ethernet/amazon/ena/ena_com.h b/drivers/net/ethernet/amazon/ena/ena_com.h index 509d7b8e15ab..c9b33ee5f258 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.h +++ b/drivers/net/ethernet/amazon/ena/ena_com.h @@ -33,6 +33,7 @@ #ifndef ENA_COM #define ENA_COM +#include <linux/compiler.h> #include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/gfp.h> diff --git a/drivers/net/ethernet/amazon/ena/ena_eth_com.c b/drivers/net/ethernet/amazon/ena/ena_eth_com.c index 539c536464a5..f999305e1363 100644 --- a/drivers/net/ethernet/amazon/ena/ena_eth_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_eth_com.c @@ -45,7 +45,7 @@ static inline struct ena_eth_io_rx_cdesc_base *ena_com_get_next_rx_cdesc( cdesc = (struct ena_eth_io_rx_cdesc_base *)(io_cq->cdesc_addr.virt_addr + (head_masked * io_cq->cdesc_entry_size_in_bytes)); - desc_phase = (cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_PHASE_MASK) >> + desc_phase = (READ_ONCE(cdesc->status) & ENA_ETH_IO_RX_CDESC_BASE_PHASE_MASK) >> ENA_ETH_IO_RX_CDESC_BASE_PHASE_SHIFT; if (desc_phase != expected_phase) @@ -141,7 +141,7 @@ static inline u16 ena_com_cdesc_rx_pkt_get(struct ena_com_io_cq *io_cq, ena_com_cq_inc_head(io_cq); count++; - last = (cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_LAST_MASK) >> + last = (READ_ONCE(cdesc->status) & ENA_ETH_IO_RX_CDESC_BASE_LAST_MASK) >> ENA_ETH_IO_RX_CDESC_BASE_LAST_SHIFT; } while (!last); @@ -489,13 +489,13 @@ int ena_com_tx_comp_req_id_get(struct ena_com_io_cq *io_cq, u16 *req_id) * expected, it mean that the device still didn't update * this completion. */ - cdesc_phase = cdesc->flags & ENA_ETH_IO_TX_CDESC_PHASE_MASK; + cdesc_phase = READ_ONCE(cdesc->flags) & ENA_ETH_IO_TX_CDESC_PHASE_MASK; if (cdesc_phase != expected_phase) return -EAGAIN; ena_com_cq_inc_head(io_cq); - *req_id = cdesc->req_id; + *req_id = READ_ONCE(cdesc->req_id); return 0; } |