net: ena: fix missing calls to READ_ONCE

[ Upstream commit 28abf4e9c9201eda5c4d29ea609d07e877b464b8 ]

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>

diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c
index e3b7a71fcad940bad61802a2c77157b9b965713d..1a4ffc5d3da4ebd2a3662a78885a6086f3cdfb40 100644 (file)
--- a/drivers/net/ethernet/amazon/ena/ena_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_com.c
@@ -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 +