From cd0a719fbd702eb4b455a6ad986483750125588a Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Thu, 19 Aug 2021 17:17:55 +0300 Subject: [PATCH] net: dpaa2-switch: disable the control interface on error path Currently dpaa2_switch_takedown has a funny name and does not do the opposite of dpaa2_switch_init, which makes probing fail when we need to handle an -EPROBE_DEFER. A sketch of what dpaa2_switch_init does: dpsw_open dpaa2_switch_detect_features dpsw_reset for (i = 0; i < ethsw->sw_attr.num_ifs; i++) { dpsw_if_disable dpsw_if_set_stp dpsw_vlan_remove_if_untagged dpsw_if_set_tci dpsw_vlan_remove_if } dpsw_vlan_remove alloc_ordered_workqueue dpsw_fdb_remove dpaa2_switch_ctrl_if_setup When dpaa2_switch_takedown is called from the error path of dpaa2_switch_probe(), the control interface, enabled by dpaa2_switch_ctrl_if_setup from dpaa2_switch_init, remains enabled, because dpaa2_switch_takedown does not call dpaa2_switch_ctrl_if_teardown. Since dpaa2_switch_probe might fail due to EPROBE_DEFER of a PHY, this means that a second probe of the driver will happen with the control interface directly enabled. This will trigger a second error: [ 93.273528] fsl_dpaa2_switch dpsw.0: dpsw_ctrl_if_set_pools() failed [ 93.281966] fsl_dpaa2_switch dpsw.0: fsl_mc_driver_probe failed: -13 [ 93.288323] fsl_dpaa2_switch: probe of dpsw.0 failed with error -13 Which if we investigate the /dev/dpaa2_mc_console log, we find out is caused by: [E, ctrl_if_set_pools:2211, DPMNG] ctrl_if must be disabled So make dpaa2_switch_takedown do the opposite of dpaa2_switch_init (in reasonable limits, no reason to change STP state, re-add VLANs etc), and rename it to something more conventional, like dpaa2_switch_teardown. Fixes: 613c0a5810b7 ("staging: dpaa2-switch: enable the control interface") Signed-off-by: Vladimir Oltean Reviewed-by: Ioana Ciornei Link: https://lore.kernel.org/r/20210819141755.1931423-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski --- .../ethernet/freescale/dpaa2/dpaa2-switch.c | 36 +++++++++---------- 1 file changed, 18 insertions(+), 18 deletions(-) diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c index 68b78642c045..98cc0133c343 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c @@ -3038,26 +3038,30 @@ static int dpaa2_switch_port_init(struct ethsw_port_priv *port_priv, u16 port) return err; } -static void dpaa2_switch_takedown(struct fsl_mc_device *sw_dev) +static void dpaa2_switch_ctrl_if_teardown(struct ethsw_core *ethsw) +{ + dpsw_ctrl_if_disable(ethsw->mc_io, 0, ethsw->dpsw_handle); + dpaa2_switch_free_dpio(ethsw); + dpaa2_switch_destroy_rings(ethsw); + dpaa2_switch_drain_bp(ethsw); + dpaa2_switch_free_dpbp(ethsw); +} + +static void dpaa2_switch_teardown(struct fsl_mc_device *sw_dev) { struct device *dev = &sw_dev->dev; struct ethsw_core *ethsw = dev_get_drvdata(dev); int err; + dpaa2_switch_ctrl_if_teardown(ethsw); + + destroy_workqueue(ethsw->workqueue); + err = dpsw_close(ethsw->mc_io, 0, ethsw->dpsw_handle); if (err) dev_warn(dev, "dpsw_close err %d\n", err); } -static void dpaa2_switch_ctrl_if_teardown(struct ethsw_core *ethsw) -{ - dpsw_ctrl_if_disable(ethsw->mc_io, 0, ethsw->dpsw_handle); - dpaa2_switch_free_dpio(ethsw); - dpaa2_switch_destroy_rings(ethsw); - dpaa2_switch_drain_bp(ethsw); - dpaa2_switch_free_dpbp(ethsw); -} - static int dpaa2_switch_remove(struct fsl_mc_device *sw_dev) { struct ethsw_port_priv *port_priv; @@ -3068,8 +3072,6 @@ static int dpaa2_switch_remove(struct fsl_mc_device *sw_dev) dev = &sw_dev->dev; ethsw = dev_get_drvdata(dev); - dpaa2_switch_ctrl_if_teardown(ethsw); - dpaa2_switch_teardown_irqs(sw_dev); dpsw_disable(ethsw->mc_io, 0, ethsw->dpsw_handle); @@ -3084,9 +3086,7 @@ static int dpaa2_switch_remove(struct fsl_mc_device *sw_dev) kfree(ethsw->acls); kfree(ethsw->ports); - dpaa2_switch_takedown(sw_dev); - - destroy_workqueue(ethsw->workqueue); + dpaa2_switch_teardown(sw_dev); fsl_mc_portal_free(ethsw->mc_io); @@ -3199,7 +3199,7 @@ static int dpaa2_switch_probe(struct fsl_mc_device *sw_dev) GFP_KERNEL); if (!(ethsw->ports)) { err = -ENOMEM; - goto err_takedown; + goto err_teardown; } ethsw->fdbs = kcalloc(ethsw->sw_attr.num_ifs, sizeof(*ethsw->fdbs), @@ -3270,8 +3270,8 @@ err_free_fdbs: err_free_ports: kfree(ethsw->ports); -err_takedown: - dpaa2_switch_takedown(sw_dev); +err_teardown: + dpaa2_switch_teardown(sw_dev); err_free_cmdport: fsl_mc_portal_free(ethsw->mc_io); -- 2.34.1