4.20-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 68f60538daa4bc3da5d0764d46f391916fba20fd ] The probe function needs to verify the CvP enable bit in order to properly determine if FPGA Manager functionality can be safely enabled. Fixes: 34d1dc17ce97 ("fpga manager: Add Altera CvP driver") Signed-off-by: Andreas Puhm <puhm@xxxxxxxxxx> Signed-off-by: Anatolij Gustschin <agust@xxxxxxx> Reviewed-by: Moritz Fischer <mdf@xxxxxxxxxx> Acked-by: Alan Tull <atull@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/fpga/altera-cvp.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/fpga/altera-cvp.c b/drivers/fpga/altera-cvp.c index d9fa7d4bf11f..36d79b039c57 100644 --- a/drivers/fpga/altera-cvp.c +++ b/drivers/fpga/altera-cvp.c @@ -403,6 +403,7 @@ static int altera_cvp_probe(struct pci_dev *pdev, struct altera_cvp_conf *conf; struct fpga_manager *mgr; u16 cmd, val; + u32 regval; int ret; /* @@ -416,6 +417,14 @@ static int altera_cvp_probe(struct pci_dev *pdev, return -ENODEV; } + pci_read_config_dword(pdev, VSE_CVP_STATUS, ®val); + if (!(regval & VSE_CVP_STATUS_CVP_EN)) { + dev_err(&pdev->dev, + "CVP is disabled for this device: CVP_STATUS Reg 0x%x\n", + regval); + return -ENODEV; + } + conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL); if (!conf) return -ENOMEM; -- 2.19.1