[{"id":3688149,"web_url":"http://patchwork.ozlabs.org/comment/3688149/","msgid":"<05165d50-d60f-4afb-aeb4-1c20641379ce@intel.com>","list_archive_url":null,"date":"2026-05-08T04:15:00","subject":"Re: [Intel-wired-lan] [PATCH iwl-next 2/8] ixgbe: use int instead\n of u32 for error code variables","submitter":{"id":85252,"url":"http://patchwork.ozlabs.org/api/people/85252/","name":"Przemek Kitszel","email":"przemyslaw.kitszel@intel.com"},"content":"On 5/8/26 05:12, Aleksandr Loktionov wrote:\n> The variables used to store return values of kernel and driver functions\n> throughout the ixgbe driver are declared as u32 in several places. Such\n> functions return negative errno values on error (e.g. -EIO, -EFAULT),\n> which are sign-extended negative integers. Storing them in an unsigned\n> u32 silently wraps the value: -EIO (0xFFFFFFF7) stored in u32 becomes a\n> large positive number, so any \"if (status)\" truthiness check still works\n> by accident, but comparisons against specific negative error codes or\n> propagation up the call stack produce wrong results.\n> \n> In the Linux kernel, u32 is reserved for fixed-width quantities used in\n> hardware interfaces or protocol structures. Using it for generic error\n> codes misleads reviewers into thinking the value is hardware-constrained.\n> \n> Change all such local variables from u32 to int driver-wide: one in\n> ixgbe_main.c (ixgbe_resume), three in ixgbe_phy.c\n> (ixgbe_identify_phy_generic, ixgbe_tn_check_overtemp,\n> ixgbe_set_copper_phy_power), and six in ixgbe_x550.c\n> (ixgbe_check_link_t_X550em, ixgbe_get_lasi_ext_t_x550em,\n> ixgbe_enable_lasi_ext_t_x550em, ixgbe_handle_lasi_ext_t_x550em,\n> ixgbe_ext_phy_t_x550em_get_link, ixgbe_setup_internal_phy_t_x550em).\n> \n> No functional change.\n\nunless there is a check \"status < 0\" somewhere\nanyway, that's why the preferred style is to write \"!status\" or \"status\"\n\nReviewed-by: Przemek Kitszel \n\n> \n> Reviewed-by: Simon Horman \n> Signed-off-by: Aleksandr Loktionov \n> ---\n> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 2 +-\n> drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c | 6 +++---\n> drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c | 12 ++++++------\n> 3 files changed, 10 insertions(+), 10 deletions(-)\n> \n> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c\n> index 65426a1..b6308c1 100644\n> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c\n> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c\n> @@ -7528,7 +7528,7 @@ static int ixgbe_resume(struct device *dev_d)\n> \tstruct pci_dev *pdev = to_pci_dev(dev_d);\n> \tstruct ixgbe_adapter *adapter = pci_get_drvdata(pdev);\n> \tstruct net_device *netdev = adapter->netdev;\n> -\tu32 err;\n> +\tint err;\n> \n> \tadapter->hw.hw_addr = adapter->io_addr;\n> \n> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c\n> index ab733e7..de8f6c6 100644\n> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c\n> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c\n> @@ -262,7 +262,7 @@ static bool ixgbe_probe_phy(struct ixgbe_hw *hw, u16 phy_addr)\n> **/\n> int ixgbe_identify_phy_generic(struct ixgbe_hw *hw)\n> {\n> -\tu32 status = -EFAULT;\n> +\tint status = -EFAULT;\n> \tu32 phy_addr;\n> \n> \tif (!hw->phy.phy_semaphore_mask) {\n> @@ -2811,7 +2811,7 @@ static void ixgbe_i2c_bus_clear(struct ixgbe_hw *hw)\n> bool ixgbe_tn_check_overtemp(struct ixgbe_hw *hw)\n> {\n> \tu16 phy_data = 0;\n> -\tu32 status;\n> +\tint status;\n> \n> \tif (hw->device_id != IXGBE_DEV_ID_82599_T3_LOM)\n> \t\treturn false;\n> @@ -2831,7 +2831,7 @@ bool ixgbe_tn_check_overtemp(struct ixgbe_hw *hw)\n> **/\n> int ixgbe_set_copper_phy_power(struct ixgbe_hw *hw, bool on)\n> {\n> -\tu32 status;\n> +\tint status;\n> \tu16 reg;\n> \n> \t/* Bail if we don't have copper phy */\n> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c\n> index 76d2fa3..9b14f3b 100644\n> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c\n> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c\n> @@ -1911,7 +1911,7 @@ static int ixgbe_check_link_t_X550em(struct ixgbe_hw *hw,\n> \t\t\t\t bool *link_up,\n> \t\t\t\t bool link_up_wait_to_complete)\n> {\n> -\tu32 status;\n> +\tint status;\n> \tu16 i, autoneg_status;\n> \n> \tif (hw->mac.ops.get_media_type(hw) != ixgbe_media_type_copper)\n> @@ -2330,7 +2330,7 @@ static int ixgbe_get_link_capabilities_X550em(struct ixgbe_hw *hw,\n> static int ixgbe_get_lasi_ext_t_x550em(struct ixgbe_hw *hw, bool *lsc,\n> \t\t\t\t bool *is_overtemp)\n> {\n> -\tu32 status;\n> +\tint status;\n> \tu16 reg;\n> \n> \t*is_overtemp = false;\n> @@ -2418,7 +2418,7 @@ static int ixgbe_get_lasi_ext_t_x550em(struct ixgbe_hw *hw, bool *lsc,\n> static int ixgbe_enable_lasi_ext_t_x550em(struct ixgbe_hw *hw)\n> {\n> \tbool lsc, overtemp;\n> -\tu32 status;\n> +\tint status;\n> \tu16 reg;\n> \n> \t/* Clear interrupt flags */\n> @@ -2512,7 +2512,7 @@ static int ixgbe_handle_lasi_ext_t_x550em(struct ixgbe_hw *hw,\n> {\n> \tstruct ixgbe_phy_info *phy = &hw->phy;\n> \tbool lsc;\n> -\tu32 status;\n> +\tint status;\n> \n> \tstatus = ixgbe_get_lasi_ext_t_x550em(hw, &lsc, is_overtemp);\n> \tif (status)\n> @@ -2606,7 +2606,7 @@ static int ixgbe_setup_kr_x550em(struct ixgbe_hw *hw)\n> **/\n> static int ixgbe_ext_phy_t_x550em_get_link(struct ixgbe_hw *hw, bool *link_up)\n> {\n> -\tu32 ret;\n> +\tint ret;\n> \tu16 autoneg_status;\n> \n> \t*link_up = false;\n> @@ -2642,7 +2642,7 @@ static int ixgbe_setup_internal_phy_t_x550em(struct ixgbe_hw *hw)\n> {\n> \tixgbe_link_speed force_speed;\n> \tbool link_up;\n> -\tu32 status;\n> +\tint status;\n> \tu16 speed;\n> \n> \tif (hw->mac.ops.get_media_type(hw) != ixgbe_media_type_copper)","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default 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