From: Rosen Penev Date: Thu, 12 Sep 2024 02:49:02 +0000 (-0700) Subject: net: ibm: emac: remove all waiting code X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=c092d0be38f4f754cdbdc76dc6df628ca48ac0eb;p=linux-2.6-microblaze.git net: ibm: emac: remove all waiting code EPROBE_DEFER, which probably wasn't available when this driver was written, can be used instead of waiting manually. Signed-off-by: Rosen Penev Link: https://patch.msgid.link/20240912024903.6201-9-rosenp@gmail.com Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/ethernet/ibm/emac/core.c b/drivers/net/ethernet/ibm/emac/core.c index 6556f9b2b48f..60c4943ca09d 100644 --- a/drivers/net/ethernet/ibm/emac/core.c +++ b/drivers/net/ethernet/ibm/emac/core.c @@ -32,7 +32,6 @@ #include #include #include -#include #include #include #include @@ -96,11 +95,6 @@ MODULE_LICENSE("GPL"); static u32 busy_phy_map; static DEFINE_MUTEX(emac_phy_map_lock); -/* This is the wait queue used to wait on any event related to probe, that - * is discovery of MALs, other EMACs, ZMII/RGMIIs, etc... - */ -static DECLARE_WAIT_QUEUE_HEAD(emac_probe_wait); - /* Having stable interface names is a doomed idea. However, it would be nice * if we didn't have completely random interface names at boot too :-) It's * just a matter of making everybody's life easier. Since we are doing @@ -116,9 +110,6 @@ static DECLARE_WAIT_QUEUE_HEAD(emac_probe_wait); #define EMAC_BOOT_LIST_SIZE 4 static struct device_node *emac_boot_list[EMAC_BOOT_LIST_SIZE]; -/* How long should I wait for dependent devices ? */ -#define EMAC_PROBE_DEP_TIMEOUT (HZ * 5) - /* I don't want to litter system log with timeout errors * when we have brain-damaged PHY. */ @@ -973,8 +964,6 @@ static void __emac_set_multicast_list(struct emac_instance *dev) * we need is just to stop RX channel. This seems to work on all * tested SoCs. --ebs * - * If we need the full reset, we might just trigger the workqueue - * and do it async... a bit nasty but should work --BenH */ dev->mcast_pending = 0; emac_rx_disable(dev); @@ -2378,7 +2367,9 @@ static int emac_check_deps(struct emac_instance *dev, if (deps[i].drvdata != NULL) there++; } - return there == EMAC_DEP_COUNT; + if (there != EMAC_DEP_COUNT) + return -EPROBE_DEFER; + return 0; } static void emac_put_deps(struct emac_instance *dev) @@ -2390,19 +2381,6 @@ static void emac_put_deps(struct emac_instance *dev) platform_device_put(dev->tah_dev); } -static int emac_of_bus_notify(struct notifier_block *nb, unsigned long action, - void *data) -{ - /* We are only intereted in device addition */ - if (action == BUS_NOTIFY_BOUND_DRIVER) - wake_up_all(&emac_probe_wait); - return 0; -} - -static struct notifier_block emac_of_bus_notifier = { - .notifier_call = emac_of_bus_notify -}; - static int emac_wait_deps(struct emac_instance *dev) { struct emac_depentry deps[EMAC_DEP_COUNT]; @@ -2419,18 +2397,13 @@ static int emac_wait_deps(struct emac_instance *dev) deps[EMAC_DEP_MDIO_IDX].phandle = dev->mdio_ph; if (dev->blist && dev->blist > emac_boot_list) deps[EMAC_DEP_PREV_IDX].phandle = 0xffffffffu; - bus_register_notifier(&platform_bus_type, &emac_of_bus_notifier); - wait_event_timeout(emac_probe_wait, - emac_check_deps(dev, deps), - EMAC_PROBE_DEP_TIMEOUT); - bus_unregister_notifier(&platform_bus_type, &emac_of_bus_notifier); - err = emac_check_deps(dev, deps) ? 0 : -ENODEV; + err = emac_check_deps(dev, deps); for (i = 0; i < EMAC_DEP_COUNT; i++) { of_node_put(deps[i].node); if (err) platform_device_put(deps[i].ofdev); } - if (err == 0) { + if (!err) { dev->mal_dev = deps[EMAC_DEP_MAL_IDX].ofdev; dev->zmii_dev = deps[EMAC_DEP_ZMII_IDX].ofdev; dev->rgmii_dev = deps[EMAC_DEP_RGMII_IDX].ofdev; @@ -3087,12 +3060,8 @@ static int emac_probe(struct platform_device *ofdev) /* Wait for dependent devices */ err = emac_wait_deps(dev); - if (err) { - printk(KERN_ERR - "%pOF: Timeout waiting for dependent devices\n", np); - /* display more info about what's missing ? */ + if (err) goto err_irq_unmap; - } dev->mal = platform_get_drvdata(dev->mal_dev); if (dev->mdio_dev != NULL) dev->mdio_instance = platform_get_drvdata(dev->mdio_dev); @@ -3192,10 +3161,6 @@ static int emac_probe(struct platform_device *ofdev) wmb(); platform_set_drvdata(ofdev, dev); - /* There's a new kid in town ! Let's tell everybody */ - wake_up_all(&emac_probe_wait); - - printk(KERN_INFO "%s: EMAC-%d %pOF, MAC %pM\n", ndev->name, dev->cell_index, np, ndev->dev_addr); @@ -3228,14 +3193,8 @@ static int emac_probe(struct platform_device *ofdev) if (dev->wol_irq) irq_dispose_mapping(dev->wol_irq); err_gone: - /* if we were on the bootlist, remove us as we won't show up and - * wake up all waiters to notify them in case they were waiting - * on us - */ - if (blist) { + if (blist) *blist = NULL; - wake_up_all(&emac_probe_wait); - } return err; }