drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c:5638 bnx2x_link_settings_status() warn: signedness bug returning '(-22)'

From: Dan Carpenter
Date: Wed Oct 07 2020 - 03:42:51 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: d3d45f8220d60a0b2aaaacf8fb2be4e6ffd9008e
commit: 2c855d73f2f6107f5b8ebc45f8b934bf7f4419e0 bnx2x: Remove read_status_t function casts
config: x86_64-randconfig-m001-20201003 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

New smatch warnings:
drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c:5638 bnx2x_link_settings_status() warn: signedness bug returning '(-22)'

Old smatch warnings:
drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c:7184 bnx2x_8073_8727_external_rom_boot() error: uninitialized symbol 'fw_ver1'.

vim +5638 drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c

2c855d73f2f6107 drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Kees Cook 2019-11-14 5614 static u8 bnx2x_link_settings_status(struct bnx2x_phy *phy,
^^

3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5615 struct link_params *params,
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5616 struct link_vars *vars)
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5617 {
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5618 struct bnx2x *bp = params->bp;
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5619
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5620 u16 gp_status, duplex = DUPLEX_HALF, link_up = 0, speed_mask;
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5621 int rc = 0;
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5622
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5623 /* Read gp_status */
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5624 CL22_RD_OVER_CL45(bp, phy,
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5625 MDIO_REG_BANK_GP_STATUS,
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5626 MDIO_GP_STATUS_TOP_AN_STATUS1,
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5627 &gp_status);
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5628 if (gp_status & MDIO_GP_STATUS_TOP_AN_STATUS1_DUPLEX_STATUS)
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5629 duplex = DUPLEX_FULL;
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5630 if (gp_status & MDIO_GP_STATUS_TOP_AN_STATUS1_LINK_STATUS)
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5631 link_up = 1;
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5632 speed_mask = gp_status & GP_STATUS_SPEED_MASK;
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5633 DP(NETIF_MSG_LINK, "gp_status 0x%x, is_link_up %d, speed_mask 0x%x\n",
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5634 gp_status, link_up, speed_mask);
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5635 rc = bnx2x_get_link_speed_duplex(phy, params, vars, link_up, speed_mask,
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5636 duplex);
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5637 if (rc == -EINVAL)
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 @5638 return rc;
^^^^^^^^^^
return -EINVAL gets truncated to a u8.

3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5639
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5640 if (gp_status & MDIO_GP_STATUS_TOP_AN_STATUS1_LINK_STATUS) {
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5641 if (SINGLE_MEDIA_DIRECT(params)) {
430d172a635c3dd drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Yaniv Rosner 2012-09-11 5642 vars->duplex = duplex;
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5643 bnx2x_flow_ctrl_resolve(phy, params, vars, gp_status);
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5644 if (phy->req_line_speed == SPEED_AUTO_NEG)
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5645 bnx2x_xgxs_an_resolve(phy, params, vars,
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5646 gp_status);
3c9ada227c56c6f drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2011-06-14 5647 }
d231023eb17134e drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Yuval Mintz 2012-06-20 5648 } else { /* Link_down */
c18aa15d08a2d1a drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2010-09-07 5649 if ((phy->req_line_speed == SPEED_AUTO_NEG) &&
c18aa15d08a2d1a drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2010-09-07 5650 SINGLE_MEDIA_DIRECT(params)) {
239d686d494f10e drivers/net/bnx2x_link.c Eilon Greenstein 2009-08-12 5651 /* Check signal is detected */
c18aa15d08a2d1a drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2010-09-07 5652 bnx2x_check_fallback_to_cl37(phy, params);
239d686d494f10e drivers/net/bnx2x_link.c Eilon Greenstein 2009-08-12 5653 }
ea4e040abc72f2d drivers/net/bnx2x_link.c Yaniv Rosner 2008-06-23 5654 }
ea4e040abc72f2d drivers/net/bnx2x_link.c Yaniv Rosner 2008-06-23 5655
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5656 /* Read LP advertised speeds*/
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5657 if (SINGLE_MEDIA_DIRECT(params) &&
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5658 (vars->link_status & LINK_STATUS_AUTO_NEGOTIATE_COMPLETE)) {
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5659 u16 val;
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5660
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5661 CL22_RD_OVER_CL45(bp, phy, MDIO_REG_BANK_CL73_IEEEB1,
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5662 MDIO_CL73_IEEEB1_AN_LP_ADV2, &val);
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5663
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5664 if (val & MDIO_CL73_IEEEB1_AN_ADV2_ADVR_1000M_KX)
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5665 vars->link_status |=
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5666 LINK_STATUS_LINK_PARTNER_1000TFD_CAPABLE;
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5667 if (val & (MDIO_CL73_IEEEB1_AN_ADV2_ADVR_10G_KX4 |
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5668 MDIO_CL73_IEEEB1_AN_ADV2_ADVR_10G_KR))
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5669 vars->link_status |=
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5670 LINK_STATUS_LINK_PARTNER_10GXFD_CAPABLE;
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5671
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5672 CL22_RD_OVER_CL45(bp, phy, MDIO_REG_BANK_OVER_1G,
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5673 MDIO_OVER_1G_LP_UP1, &val);
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5674
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5675 if (val & MDIO_OVER_1G_UP1_2_5G)
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5676 vars->link_status |=
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5677 LINK_STATUS_LINK_PARTNER_2500XFD_CAPABLE;
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5678 if (val & (MDIO_OVER_1G_UP1_10G | MDIO_OVER_1G_UP1_10GH))
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5679 vars->link_status |=
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5680 LINK_STATUS_LINK_PARTNER_10GXFD_CAPABLE;
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5681 }
9e7e8399c5d3c4d drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c Mintz Yuval 2012-02-15 5682
a22f078867ef362 drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2010-09-07 5683 DP(NETIF_MSG_LINK, "duplex %x flow_ctrl 0x%x link_status 0x%x\n",
a22f078867ef362 drivers/net/bnx2x/bnx2x_link.c Yaniv Rosner 2010-09-07 5684 vars->duplex, vars->flow_ctrl, vars->link_status);
ea4e040abc72f2d drivers/net/bnx2x_link.c Yaniv Rosner 2008-06-23 5685 return rc;
ea4e040abc72f2d drivers/net/bnx2x_link.c Yaniv Rosner 2008-06-23 5686 }

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Next message: Johannes Berg: "Re: [PATCH v2 1/2] mmap locking API: Order lock of nascent mm outside lock of live mm"
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