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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-kernel@vger.kernel.org (open list) Subject: [PATCH net-next v2] net: phy: Improved PHY error reporting in state machine Date: Thu, 23 Mar 2023 14:45:59 -0700 Message-Id: <20230323214559.3249977-1-f.fainelli@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761197639054841631?= X-GMAIL-MSGID: =?utf-8?q?1761197639054841631?= When the PHY library calls phy_error() something bad has happened, and we halt the PHY state machine. Calling phy_error() from the main state machine however is not precise enough to know whether the issue is reading the link status or starting auto-negotiation. Signed-off-by: Florian Fainelli --- Changes in v2: - only call phy_error_precise() in phy_state_machine drivers/net/phy/phy.c | 33 ++++++++++++++++++++++++--------- 1 file changed, 24 insertions(+), 9 deletions(-) diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index b33e55a7364e..bcaf58636199 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -1169,6 +1169,22 @@ void phy_stop_machine(struct phy_device *phydev) mutex_unlock(&phydev->lock); } +static void phy_process_error(struct phy_device *phydev) +{ + mutex_lock(&phydev->lock); + phydev->state = PHY_HALTED; + mutex_unlock(&phydev->lock); + + phy_trigger_machine(phydev); +} + +static void phy_error_precise(struct phy_device *phydev, + const void *func, int err) +{ + WARN(1, "%pS: returned: %d\n", func, err); + phy_process_error(phydev); +} + /** * phy_error - enter HALTED state for this PHY device * @phydev: target phy_device struct @@ -1181,12 +1197,7 @@ void phy_stop_machine(struct phy_device *phydev) void phy_error(struct phy_device *phydev) { WARN_ON(1); - - mutex_lock(&phydev->lock); - phydev->state = PHY_HALTED; - mutex_unlock(&phydev->lock); - - phy_trigger_machine(phydev); + phy_process_error(phydev); } EXPORT_SYMBOL(phy_error); @@ -1378,6 +1389,7 @@ void phy_state_machine(struct work_struct *work) struct net_device *dev = phydev->attached_dev; bool needs_aneg = false, do_suspend = false; enum phy_state old_state; + const void *func = NULL; bool finished = false; int err = 0; @@ -1396,6 +1408,7 @@ void phy_state_machine(struct work_struct *work) case PHY_NOLINK: case PHY_RUNNING: err = phy_check_link_status(phydev); + func = &phy_check_link_status; break; case PHY_CABLETEST: err = phydev->drv->cable_test_get_status(phydev, &finished); @@ -1425,16 +1438,18 @@ void phy_state_machine(struct work_struct *work) mutex_unlock(&phydev->lock); - if (needs_aneg) + if (needs_aneg) { err = phy_start_aneg(phydev); - else if (do_suspend) + func = &phy_start_aneg; + } else if (do_suspend) { phy_suspend(phydev); + } if (err == -ENODEV) return; if (err < 0) - phy_error(phydev); + phy_error_precise(phydev, func, err); if (old_state != phydev->state) { phydev_dbg(phydev, "PHY state change %s -> %s\n",