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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>
This commit is contained in:
Netanel Belgazal 2017-02-09 15:21:35 +02:00 committed by David S. Miller
parent b1669c9f5a
commit a8496eb813
2 changed files with 5 additions and 4 deletions
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1
drivers/net/ethernet/amazon/ena/ena_com.h
View File

@ -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>

8
drivers/net/ethernet/amazon/ena/ena_eth_com.c
View File

@ -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;
}