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net: ena: fix missing calls to READ_ONCE 

[ Upstream commit 28abf4e9c9 ]

Add READ_ONCE calls where necessary (for example when iterating
over a memory field that gets updated by the hardware).

Signed-off-by: Netanel Belgazal <netanel@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Netanel Belgazal 2018-09-09 08:15:25 +00:00 committed by Greg Kroah-Hartman
parent 3e2cc5bd61
commit 36918e899e
1 changed files with 4 additions and 4 deletions
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8
drivers/net/ethernet/amazon/ena/ena_com.c
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@ -457,7 +457,7 @@ static void ena_com_handle_admin_completion(struct ena_com_admin_queue *admin_qu
cqe = &admin_queue->cq.entries[head_masked];
/* Go over all the completions */
while ((cqe->acq_common_descriptor.flags &
while ((READ_ONCE(cqe->acq_common_descriptor.flags) &
ENA_ADMIN_ACQ_COMMON_DESC_PHASE_MASK) == phase) {
/* Do not read the rest of the completion entry before the
* phase bit was validated
@ -633,7 +633,7 @@ static u32 ena_com_reg_bar_read32(struct ena_com_dev *ena_dev, u16 offset)
writel(mmio_read_reg, ena_dev->reg_bar + ENA_REGS_MMIO_REG_READ_OFF);
for (i = 0; i < timeout; i++) {
if (read_resp->req_id == mmio_read->seq_num)
if (READ_ONCE(read_resp->req_id) == mmio_read->seq_num)
break;
udelay(1);
@ -1790,8 +1790,8 @@ void ena_com_aenq_intr_handler(struct ena_com_dev *dev, void *data)
aenq_common = &aenq_e->aenq_common_desc;
/* Go over all the events */
while ((aenq_common->flags & ENA_ADMIN_AENQ_COMMON_DESC_PHASE_MASK) ==
phase) {
while ((READ_ONCE(aenq_common->flags) &
ENA_ADMIN_AENQ_COMMON_DESC_PHASE_MASK) == phase) {
pr_debug("AENQ! Group[%x] Syndrom[%x] timestamp: [%llus]\n",
aenq_common->group, aenq_common->syndrom,
(u64)aenq_common->timestamp_low +