5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Shannon Nelson <shannon.nelson@xxxxxxx>
[ Upstream commit 24f110240c03c6b5368f1203bac72883d511e606 ]
Don't rely on the PCI memory for the devcmd opcode because we
read a 0xff value if the PCI bus is broken, which can cause us
to report a bogus dev_cmd opcode later.
Signed-off-by: Shannon Nelson <shannon.nelson@xxxxxxx>
Reviewed-by: Brett Creeley <brett.creeley@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/pensando/ionic/ionic_dev.c | 1 +
drivers/net/ethernet/pensando/ionic/ionic_dev.h | 1 +
drivers/net/ethernet/pensando/ionic/ionic_main.c | 2 +-
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.c b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
index dc5fbc2704f3..b5f681918f6e 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
@@ -200,6 +200,7 @@ void ionic_dev_cmd_comp(struct ionic_dev *idev, union ionic_dev_cmd_comp *comp)
void ionic_dev_cmd_go(struct ionic_dev *idev, union ionic_dev_cmd *cmd)
{
+ idev->opcode = cmd->cmd.opcode;
memcpy_toio(&idev->dev_cmd_regs->cmd, cmd, sizeof(*cmd));
iowrite32(0, &idev->dev_cmd_regs->done);
iowrite32(1, &idev->dev_cmd_regs->doorbell);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
index 64d27e8e0772..1ce0d307a9d0 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -136,6 +136,7 @@ struct ionic_dev {
unsigned long last_hb_time;
u32 last_hb;
u8 last_fw_status;
+ u8 opcode;
u64 __iomem *db_pages;
dma_addr_t phy_db_pages;
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
index 00b6985edea0..694e710244e6 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
@@ -333,7 +333,7 @@ int ionic_dev_cmd_wait(struct ionic *ionic, unsigned long max_seconds)
*/
max_wait = jiffies + (max_seconds * HZ);
try_again:
- opcode = readb(&idev->dev_cmd_regs->cmd.cmd.opcode);
+ opcode = idev->opcode;
start_time = jiffies;
do {
done = ionic_dev_cmd_done(idev);
--
2.43.0
