From: Shannon Nelson shannon.nelson@amd.com
[ 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@amd.com Reviewed-by: Brett Creeley brett.creeley@amd.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- 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 b778d8264bca..f81b00c7e106 100644 --- a/drivers/net/ethernet/pensando/ionic/ionic_dev.c +++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c @@ -268,6 +268,7 @@ 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 38f38fe8f21d..1ab86eee8b5a 100644 --- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h +++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h @@ -144,6 +144,7 @@ struct ionic_dev { bool fw_hb_ready; bool fw_status_ready; u8 fw_generation; + 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 538c024afed5..7942a7f0f7b3 100644 --- a/drivers/net/ethernet/pensando/ionic/ionic_main.c +++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c @@ -350,7 +350,7 @@ 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);