* [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes @ 2011-12-07 13:37 Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 1/8][NET] fec.c: misc cleanups Lothar Waßmann 2011-12-07 18:38 ` [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes David Miller 0 siblings, 2 replies; 12+ messages in thread From: Lothar Waßmann @ 2011-12-07 13:37 UTC (permalink / raw) To: netdev; +Cc: linux-kernel, Shawn Guo, Lothar Waßmann The following set of patches provides some cleanup and bugfixes for drivers/net/ethernet/freescale/fec.c and makes the driver buildable as a module. Changes wrt v1: - more appropriate subject lines - fix a messup in patch 7: mii_cnt must be a driver global variable Lothar Waßmann (8): misc cleanups set con_id in clk_get() call to NULL prevent dobule restart of interface on FDX/HDX change don't request invalid IRQ don't munge MAC address from platform data preserve MII/RMII setting in fec_stop() fix the .remove code make FEC driver buildable as module drivers/net/ethernet/freescale/Kconfig | 2 +- drivers/net/ethernet/freescale/fec.c | 63 ++++++++++++++++++++++---------- 2 files changed, 44 insertions(+), 21 deletions(-) ^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH v2 1/8][NET] fec.c: misc cleanups 2011-12-07 13:37 [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes Lothar Waßmann @ 2011-12-07 13:37 ` Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 2/8][NET] fec.c: set con_id in clk_get() call to NULL Lothar Waßmann 2011-12-07 18:38 ` [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes David Miller 1 sibling, 1 reply; 12+ messages in thread From: Lothar Waßmann @ 2011-12-07 13:37 UTC (permalink / raw) To: netdev; +Cc: linux-kernel, Shawn Guo, Lothar Waßmann - remove some bogus whitespace - remove line wraps from printk messages Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/net/ethernet/freescale/fec.c | 14 ++++++++------ 1 files changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c index 1124ce0..f224e58 100644 --- a/drivers/net/ethernet/freescale/fec.c +++ b/drivers/net/ethernet/freescale/fec.c @@ -99,7 +99,7 @@ static struct platform_device_id fec_devtype[] = { MODULE_DEVICE_TABLE(platform, fec_devtype); enum imx_fec_type { - IMX25_FEC = 1, /* runs on i.mx25/50/53 */ + IMX25_FEC = 1, /* runs on i.mx25/50/53 */ IMX27_FEC, /* runs on i.mx27/35/51 */ IMX28_FEC, IMX6Q_FEC, @@ -132,7 +132,7 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address"); #elif defined (CONFIG_M5272C3) #define FEC_FLASHMAC (0xffe04000 + 4) #elif defined(CONFIG_MOD5272) -#define FEC_FLASHMAC 0xffc0406b +#define FEC_FLASHMAC 0xffc0406b #else #define FEC_FLASHMAC 0 #endif @@ -972,8 +972,9 @@ static int fec_enet_mii_probe(struct net_device *ndev) } if (phy_id >= PHY_MAX_ADDR) { - printk(KERN_INFO "%s: no PHY, assuming direct connection " - "to switch\n", ndev->name); + printk(KERN_INFO + "%s: no PHY, assuming direct connection to switch\n", + ndev->name); strncpy(mdio_bus_id, "0", MII_BUS_ID_SIZE); phy_id = 0; } @@ -998,8 +999,9 @@ static int fec_enet_mii_probe(struct net_device *ndev) fep->link = 0; fep->full_duplex = 0; - printk(KERN_INFO "%s: Freescale FEC PHY driver [%s] " - "(mii_bus:phy_addr=%s, irq=%d)\n", ndev->name, + printk(KERN_INFO + "%s: Freescale FEC PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n", + ndev->name, fep->phy_dev->drv->name, dev_name(&fep->phy_dev->dev), fep->phy_dev->irq); -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v2 2/8][NET] fec.c: set con_id in clk_get() call to NULL 2011-12-07 13:37 ` [PATCH v2 1/8][NET] fec.c: misc cleanups Lothar Waßmann @ 2011-12-07 13:37 ` Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 3/8][NET] fec.c: prevent dobule restart of interface on FDX/HDX change Lothar Waßmann 0 siblings, 1 reply; 12+ messages in thread From: Lothar Waßmann @ 2011-12-07 13:37 UTC (permalink / raw) To: netdev; +Cc: linux-kernel, Shawn Guo, Lothar Waßmann The con_id is actually not needed for clk_get(). Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/net/ethernet/freescale/fec.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c index f224e58..65ee506 100644 --- a/drivers/net/ethernet/freescale/fec.c +++ b/drivers/net/ethernet/freescale/fec.c @@ -1585,7 +1585,7 @@ fec_probe(struct platform_device *pdev) } } - fep->clk = clk_get(&pdev->dev, "fec_clk"); + fep->clk = clk_get(&pdev->dev, NULL); if (IS_ERR(fep->clk)) { ret = PTR_ERR(fep->clk); goto failed_clk; -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v2 3/8][NET] fec.c: prevent dobule restart of interface on FDX/HDX change 2011-12-07 13:37 ` [PATCH v2 2/8][NET] fec.c: set con_id in clk_get() call to NULL Lothar Waßmann @ 2011-12-07 13:37 ` Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 4/8][NET] fec.c: don't request invalid IRQ Lothar Waßmann 0 siblings, 1 reply; 12+ messages in thread From: Lothar Waßmann @ 2011-12-07 13:37 UTC (permalink / raw) To: netdev; +Cc: linux-kernel, Shawn Guo, Lothar Waßmann Upon detection of a FDX/HDX change the interface is restarted twice. Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/net/ethernet/freescale/fec.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c index 65ee506..7ef408f 100644 --- a/drivers/net/ethernet/freescale/fec.c +++ b/drivers/net/ethernet/freescale/fec.c @@ -865,6 +865,8 @@ static void fec_enet_adjust_link(struct net_device *ndev) if (phy_dev->link) { if (fep->full_duplex != phy_dev->duplex) { fec_restart(ndev, phy_dev->duplex); + /* prevent unnecessary second fec_restart() below */ + fep->link = phy_dev->link; status_change = 1; } } -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v2 4/8][NET] fec.c: don't request invalid IRQ 2011-12-07 13:37 ` [PATCH v2 3/8][NET] fec.c: prevent dobule restart of interface on FDX/HDX change Lothar Waßmann @ 2011-12-07 13:37 ` Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 5/8][NET] fec.c: don't munge MAC address from platform data Lothar Waßmann 0 siblings, 1 reply; 12+ messages in thread From: Lothar Waßmann @ 2011-12-07 13:37 UTC (permalink / raw) To: netdev; +Cc: linux-kernel, Shawn Guo, Lothar Waßmann prevent calling request_irq() with a known invalid IRQ number and preserve the return value of the platform_get_irq() function Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/net/ethernet/freescale/fec.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c index 7ef408f..e2b5ce6 100644 --- a/drivers/net/ethernet/freescale/fec.c +++ b/drivers/net/ethernet/freescale/fec.c @@ -1575,8 +1575,12 @@ fec_probe(struct platform_device *pdev) for (i = 0; i < FEC_IRQ_NUM; i++) { irq = platform_get_irq(pdev, i); - if (i && irq < 0) - break; + if (irq < 0) { + if (i) + break; + ret = irq; + goto failed_irq; + } ret = request_irq(irq, fec_enet_interrupt, IRQF_DISABLED, pdev->name, ndev); if (ret) { while (--i >= 0) { -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v2 5/8][NET] fec.c: don't munge MAC address from platform data 2011-12-07 13:37 ` [PATCH v2 4/8][NET] fec.c: don't request invalid IRQ Lothar Waßmann @ 2011-12-07 13:37 ` Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 6/8][NET] fec.c: preserve MII/RMII setting in fec_stop() Lothar Waßmann 0 siblings, 1 reply; 12+ messages in thread From: Lothar Waßmann @ 2011-12-07 13:37 UTC (permalink / raw) To: netdev; +Cc: linux-kernel, Shawn Guo, Lothar Waßmann When the MAC address is supplied via platform_data it should be OK as it is and should not be modified in case of a dual FEC setup. Also copying the MAC from platform_data to the single 'macaddr' variable will overwrite the MAC for the first interface in case of a dual FEC setup. Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/net/ethernet/freescale/fec.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c index e2b5ce6..11534b9 100644 --- a/drivers/net/ethernet/freescale/fec.c +++ b/drivers/net/ethernet/freescale/fec.c @@ -818,7 +818,7 @@ static void __inline__ fec_get_mac(struct net_device *ndev) iap = (unsigned char *)FEC_FLASHMAC; #else if (pdata) - memcpy(iap, pdata->mac, ETH_ALEN); + iap = (unsigned char *)&pdata->mac; #endif } -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v2 6/8][NET] fec.c: preserve MII/RMII setting in fec_stop() 2011-12-07 13:37 ` [PATCH v2 5/8][NET] fec.c: don't munge MAC address from platform data Lothar Waßmann @ 2011-12-07 13:37 ` Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 7/8][NET] fec.c: fix the .remove code Lothar Waßmann 0 siblings, 1 reply; 12+ messages in thread From: Lothar Waßmann @ 2011-12-07 13:37 UTC (permalink / raw) To: netdev; +Cc: linux-kernel, Shawn Guo, Lothar Waßmann Additionally to setting the ETHER_EN bit in FEC_ECNTRL the MII/RMII setting in FEC_R_CNTRL needs to be preserved to keep the MII interface functional. Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/net/ethernet/freescale/fec.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c index 11534b9..ab0afb5 100644 --- a/drivers/net/ethernet/freescale/fec.c +++ b/drivers/net/ethernet/freescale/fec.c @@ -515,6 +515,7 @@ fec_stop(struct net_device *ndev) struct fec_enet_private *fep = netdev_priv(ndev); const struct platform_device_id *id_entry = platform_get_device_id(fep->pdev); + u32 rmii_mode = readl(fep->hwp + FEC_R_CNTRL) & (1 << 8); /* We cannot expect a graceful transmit stop without link !!! */ if (fep->link) { @@ -531,8 +532,10 @@ fec_stop(struct net_device *ndev) writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK); /* We have to keep ENET enabled to have MII interrupt stay working */ - if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) + if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) { writel(2, fep->hwp + FEC_ECNTRL); + writel(rmii_mode, fep->hwp + FEC_R_CNTRL); + } } -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v2 7/8][NET] fec.c: fix the .remove code 2011-12-07 13:37 ` [PATCH v2 6/8][NET] fec.c: preserve MII/RMII setting in fec_stop() Lothar Waßmann @ 2011-12-07 13:37 ` Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 8/8][NET] fec.c: make FEC driver buildable as module Lothar Waßmann 0 siblings, 1 reply; 12+ messages in thread From: Lothar Waßmann @ 2011-12-07 13:37 UTC (permalink / raw) To: netdev; +Cc: linux-kernel, Shawn Guo, Lothar Waßmann The .remove code is broken in several ways. - mdiobus_unregister() is called twice for the same object in case of dual FEC - phy_disconnect() is being called when the PHY is already disconnected - the requested IRQ(s) are not freed - fec_stop() is being called with the inteface already stopped All of those lead to kernel crashes if the remove function is actually used. Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/net/ethernet/freescale/fec.c | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c index ab0afb5..01ee9cc 100644 --- a/drivers/net/ethernet/freescale/fec.c +++ b/drivers/net/ethernet/freescale/fec.c @@ -259,6 +259,8 @@ struct fec_enet_private { /* Transmitter timeout */ #define TX_TIMEOUT (2 * HZ) +static int mii_cnt; + static void *swap_buffer(void *bufaddr, int len) { int i; @@ -1040,8 +1042,12 @@ static int fec_enet_mii_init(struct platform_device *pdev) */ if ((id_entry->driver_data & FEC_QUIRK_ENET_MAC) && pdev->id > 0) { /* fec1 uses fec0 mii_bus */ - fep->mii_bus = fec0_mii_bus; - return 0; + if (mii_cnt && fec0_mii_bus) { + fep->mii_bus = fec0_mii_bus; + mii_cnt++; + return 0; + } + return -ENOENT; } fep->mii_timeout = 0; @@ -1086,6 +1092,8 @@ static int fec_enet_mii_init(struct platform_device *pdev) if (mdiobus_register(fep->mii_bus)) goto err_out_free_mdio_irq; + mii_cnt++; + /* save fec0 mii_bus */ if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) fec0_mii_bus = fep->mii_bus; @@ -1102,11 +1110,11 @@ err_out: static void fec_enet_mii_remove(struct fec_enet_private *fep) { - if (fep->phy_dev) - phy_disconnect(fep->phy_dev); - mdiobus_unregister(fep->mii_bus); - kfree(fep->mii_bus->irq); - mdiobus_free(fep->mii_bus); + if (--mii_cnt == 0) { + mdiobus_unregister(fep->mii_bus); + kfree(fep->mii_bus->irq); + mdiobus_free(fep->mii_bus); + } } static int fec_enet_get_settings(struct net_device *ndev, @@ -1646,13 +1654,18 @@ fec_drv_remove(struct platform_device *pdev) struct net_device *ndev = platform_get_drvdata(pdev); struct fec_enet_private *fep = netdev_priv(ndev); struct resource *r; + int i; - fec_stop(ndev); + unregister_netdev(ndev); fec_enet_mii_remove(fep); + for (i = 0; i < FEC_IRQ_NUM; i++) { + int irq = platform_get_irq(pdev, i); + if (irq > 0) + free_irq(irq, ndev); + } clk_disable(fep->clk); clk_put(fep->clk); iounmap(fep->hwp); - unregister_netdev(ndev); free_netdev(ndev); r = platform_get_resource(pdev, IORESOURCE_MEM, 0); -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH v2 8/8][NET] fec.c: make FEC driver buildable as module 2011-12-07 13:37 ` [PATCH v2 7/8][NET] fec.c: fix the .remove code Lothar Waßmann @ 2011-12-07 13:37 ` Lothar Waßmann 0 siblings, 0 replies; 12+ messages in thread From: Lothar Waßmann @ 2011-12-07 13:37 UTC (permalink / raw) To: netdev; +Cc: linux-kernel, Shawn Guo, Lothar Waßmann Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/net/ethernet/freescale/Kconfig | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/net/ethernet/freescale/Kconfig b/drivers/net/ethernet/freescale/Kconfig index c520cfd..b02e315 100644 --- a/drivers/net/ethernet/freescale/Kconfig +++ b/drivers/net/ethernet/freescale/Kconfig @@ -21,7 +21,7 @@ config NET_VENDOR_FREESCALE if NET_VENDOR_FREESCALE config FEC - bool "FEC ethernet controller (of ColdFire and some i.MX CPUs)" + tristate "FEC ethernet controller (of ColdFire and some i.MX CPUs)" depends on (M523x || M527x || M5272 || M528x || M520x || M532x || \ ARCH_MXC || ARCH_MXS) select PHYLIB -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* Re: [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes 2011-12-07 13:37 [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 1/8][NET] fec.c: misc cleanups Lothar Waßmann @ 2011-12-07 18:38 ` David Miller 2011-12-08 7:01 ` Lothar Waßmann 1 sibling, 1 reply; 12+ messages in thread From: David Miller @ 2011-12-07 18:38 UTC (permalink / raw) To: LW; +Cc: netdev, linux-kernel, shawn.guo From: Lothar Waßmann <LW@KARO-electronics.de> Date: Wed, 7 Dec 2011 14:37:12 +0100 > The following set of patches provides some cleanup and bugfixes for > drivers/net/ethernet/freescale/fec.c and makes the driver buildable as > a module. 1) I said to use a subject prefix of "fec: " not "fec.c: " 2) You did not integrate Shawn's "Acked-by: " tags, I'm not going to go sifting through the previous patch postings to collect them up, that's your job. ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes 2011-12-07 18:38 ` [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes David Miller @ 2011-12-08 7:01 ` Lothar Waßmann 2011-12-08 7:05 ` Shawn Guo 0 siblings, 1 reply; 12+ messages in thread From: Lothar Waßmann @ 2011-12-08 7:01 UTC (permalink / raw) To: David Miller; +Cc: netdev, linux-kernel, shawn.guo Hi, David Miller writes: > From: Lothar Waßmann <LW@KARO-electronics.de> > Date: Wed, 7 Dec 2011 14:37:12 +0100 > > > The following set of patches provides some cleanup and bugfixes for > > drivers/net/ethernet/freescale/fec.c and makes the driver buildable as > > a module. > > 1) I said to use a subject prefix of "fec: " not "fec.c: " > OK. > 2) You did not integrate Shawn's "Acked-by: " tags, I'm not going to > go sifting through the previous patch postings to collect them up, > that's your job. > I still got no Ack from Shawn for patches 3 and 5 and only Tested-by for patches 6 thru 8. Should I wait for Shawn's Ack for those patches too, or should I resent now? Lothar Waßmann -- ___________________________________________________________ Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10 Geschäftsführer: Matthias Kaussen Handelsregistereintrag: Amtsgericht Aachen, HRB 4996 www.karo-electronics.de | info@karo-electronics.de ___________________________________________________________ ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes 2011-12-08 7:01 ` Lothar Waßmann @ 2011-12-08 7:05 ` Shawn Guo 0 siblings, 0 replies; 12+ messages in thread From: Shawn Guo @ 2011-12-08 7:05 UTC (permalink / raw) To: Lothar Waßmann; +Cc: David Miller, netdev, linux-kernel On 8 December 2011 15:01, Lothar Waßmann <LW@karo-electronics.de> wrote: > Hi, > > David Miller writes: >> From: Lothar Waßmann <LW@KARO-electronics.de> >> Date: Wed, 7 Dec 2011 14:37:12 +0100 >> >> > The following set of patches provides some cleanup and bugfixes for >> > drivers/net/ethernet/freescale/fec.c and makes the driver buildable as >> > a module. >> >> 1) I said to use a subject prefix of "fec: " not "fec.c: " >> > OK. To be consistent with existing commits, I would suggest use "net/fec: " as the subject prefix. > >> 2) You did not integrate Shawn's "Acked-by: " tags, I'm not going to >> go sifting through the previous patch postings to collect them up, >> that's your job. >> > I still got no Ack from Shawn for patches 3 and 5 and only Tested-by > for patches 6 thru 8. Should I wait for Shawn's Ack for those patches > too, or should I resent now? > For the whole series, Acked-by: Shawn Guo <shawn.guo@linaro.org> -- Regards, Shawn ^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2011-12-08 7:05 UTC | newest] Thread overview: 12+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2011-12-07 13:37 [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 1/8][NET] fec.c: misc cleanups Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 2/8][NET] fec.c: set con_id in clk_get() call to NULL Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 3/8][NET] fec.c: prevent dobule restart of interface on FDX/HDX change Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 4/8][NET] fec.c: don't request invalid IRQ Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 5/8][NET] fec.c: don't munge MAC address from platform data Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 6/8][NET] fec.c: preserve MII/RMII setting in fec_stop() Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 7/8][NET] fec.c: fix the .remove code Lothar Waßmann 2011-12-07 13:37 ` [PATCH v2 8/8][NET] fec.c: make FEC driver buildable as module Lothar Waßmann 2011-12-07 18:38 ` [PATCH v2 0/8][NET] fec.c: several cleanups and bugfixes David Miller 2011-12-08 7:01 ` Lothar Waßmann 2011-12-08 7:05 ` Shawn Guo
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