From ec32115db2bcb7133171c6a036107ca7eb62267f Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 6 Nov 2012 04:53:07 +0000 Subject: [PATCH] usbnet: smsc95xx: apply the introduced usbnet_{read|write}_cmd_nopm This patch applies the introduced usbnet_read_cmd_nopm() and usbnet_write_cmd_nopm() in the callback of resume and suspend to avoid deadlock if USB runtime PM is considered into usbnet_read_cmd() and usbnet_write_cmd(). Cc: Steve Glendinning Signed-off-by: Ming Lei Signed-off-by: David S. Miller --- drivers/net/usb/smsc95xx.c | 134 +++++++++++++++++++++++-------------- 1 file changed, 85 insertions(+), 49 deletions(-) diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c index 05ead8a3335c..690022afaf9b 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -73,20 +73,26 @@ static bool turbo_mode = true; module_param(turbo_mode, bool, 0644); MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction"); -static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index, - u32 *data) +static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index, + u32 *data, int in_pm) { u32 buf; int ret; + int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16); BUG_ON(!dev); - ret = usbnet_read_cmd(dev, USB_VENDOR_REQUEST_READ_REGISTER, - USB_DIR_IN | USB_TYPE_VENDOR | - USB_RECIP_DEVICE, - 0, index, &buf, 4); + if (!in_pm) + fn = usbnet_read_cmd; + else + fn = usbnet_read_cmd_nopm; + + ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN + | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0, index, &buf, 4); if (unlikely(ret < 0)) - netdev_warn(dev->net, "Failed to read register index 0x%08x\n", index); + netdev_warn(dev->net, + "Failed to read reg index 0x%08x: %d", index, ret); le32_to_cpus(&buf); *data = buf; @@ -94,35 +100,64 @@ static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index, return ret; } -static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index, - u32 data) +static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index, + u32 data, int in_pm) { u32 buf; int ret; + int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16); BUG_ON(!dev); + if (!in_pm) + fn = usbnet_write_cmd; + else + fn = usbnet_write_cmd_nopm; + buf = data; cpu_to_le32s(&buf); - - ret = usbnet_write_cmd(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, - USB_DIR_OUT | USB_TYPE_VENDOR | - USB_RECIP_DEVICE, - 0, index, &buf, 4); + ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT + | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0, index, &buf, 4); if (unlikely(ret < 0)) - netdev_warn(dev->net, "Failed to write register index 0x%08x\n", index); + netdev_warn(dev->net, + "Failed to write reg index 0x%08x: %d", index, ret); return ret; } +static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index, + u32 *data) +{ + return __smsc95xx_read_reg(dev, index, data, 1); +} + +static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index, + u32 data) +{ + return __smsc95xx_write_reg(dev, index, data, 1); +} + +static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index, + u32 *data) +{ + return __smsc95xx_read_reg(dev, index, data, 0); +} + +static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index, + u32 data) +{ + return __smsc95xx_write_reg(dev, index, data, 0); +} static int smsc95xx_set_feature(struct usbnet *dev, u32 feature) { if (WARN_ON_ONCE(!dev)) return -EINVAL; - return usbnet_write_cmd(dev, USB_REQ_SET_FEATURE, - USB_RECIP_DEVICE, feature, 0, NULL, 0); + return usbnet_write_cmd_nopm(dev, USB_REQ_SET_FEATURE, + USB_RECIP_DEVICE, feature, 0, + NULL, 0); } static int smsc95xx_clear_feature(struct usbnet *dev, u32 feature) @@ -130,8 +165,9 @@ static int smsc95xx_clear_feature(struct usbnet *dev, u32 feature) if (WARN_ON_ONCE(!dev)) return -EINVAL; - return usbnet_write_cmd(dev, USB_REQ_CLEAR_FEATURE, - USB_RECIP_DEVICE, feature, 0, NULL, 0); + return usbnet_write_cmd_nopm(dev, USB_REQ_CLEAR_FEATURE, + USB_RECIP_DEVICE, feature, + 0, NULL, 0); } /* Loop until the read is completed with timeout @@ -708,7 +744,7 @@ static int smsc95xx_start_tx_path(struct usbnet *dev) } /* Starts the Receive path */ -static int smsc95xx_start_rx_path(struct usbnet *dev) +static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm) { struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]); unsigned long flags; @@ -718,7 +754,7 @@ static int smsc95xx_start_rx_path(struct usbnet *dev) pdata->mac_cr |= MAC_CR_RXEN_; spin_unlock_irqrestore(&pdata->mac_cr_lock, flags); - ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr); + ret = __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm); check_warn_return(ret, "Failed to write MAC_CR: %d\n", ret); return 0; @@ -937,7 +973,7 @@ static int smsc95xx_reset(struct usbnet *dev) ret = smsc95xx_start_tx_path(dev); check_warn_return(ret, "Failed to start TX path"); - ret = smsc95xx_start_rx_path(dev); + ret = smsc95xx_start_rx_path(dev, 0); check_warn_return(ret, "Failed to start RX path"); netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n"); @@ -1039,30 +1075,30 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message) netdev_info(dev->net, "entering SUSPEND2 mode"); /* disable energy detect (link up) & wake up events */ - ret = smsc95xx_read_reg(dev, WUCSR, &val); + ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val); check_warn_return(ret, "Error reading WUCSR"); val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_); - ret = smsc95xx_write_reg(dev, WUCSR, val); + ret = smsc95xx_write_reg_nopm(dev, WUCSR, val); check_warn_return(ret, "Error writing WUCSR"); - ret = smsc95xx_read_reg(dev, PM_CTRL, &val); + ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val); check_warn_return(ret, "Error reading PM_CTRL"); val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_); - ret = smsc95xx_write_reg(dev, PM_CTRL, val); + ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); check_warn_return(ret, "Error writing PM_CTRL"); /* enter suspend2 mode */ - ret = smsc95xx_read_reg(dev, PM_CTRL, &val); + ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val); check_warn_return(ret, "Error reading PM_CTRL"); val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_); val |= PM_CTL_SUS_MODE_2; - ret = smsc95xx_write_reg(dev, PM_CTRL, val); + ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); check_warn_return(ret, "Error writing PM_CTRL"); return 0; @@ -1131,7 +1167,7 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message) } for (i = 0; i < (pdata->wuff_filter_count * 4); i++) { - ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]); + ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]); if (ret < 0) kfree(filter_mask); check_warn_return(ret, "Error writing WUFF"); @@ -1139,43 +1175,43 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message) kfree(filter_mask); for (i = 0; i < (pdata->wuff_filter_count / 4); i++) { - ret = smsc95xx_write_reg(dev, WUFF, command[i]); + ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]); check_warn_return(ret, "Error writing WUFF"); } for (i = 0; i < (pdata->wuff_filter_count / 4); i++) { - ret = smsc95xx_write_reg(dev, WUFF, offset[i]); + ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]); check_warn_return(ret, "Error writing WUFF"); } for (i = 0; i < (pdata->wuff_filter_count / 2); i++) { - ret = smsc95xx_write_reg(dev, WUFF, crc[i]); + ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]); check_warn_return(ret, "Error writing WUFF"); } /* clear any pending pattern match packet status */ - ret = smsc95xx_read_reg(dev, WUCSR, &val); + ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val); check_warn_return(ret, "Error reading WUCSR"); val |= WUCSR_WUFR_; - ret = smsc95xx_write_reg(dev, WUCSR, val); + ret = smsc95xx_write_reg_nopm(dev, WUCSR, val); check_warn_return(ret, "Error writing WUCSR"); } if (pdata->wolopts & WAKE_MAGIC) { /* clear any pending magic packet status */ - ret = smsc95xx_read_reg(dev, WUCSR, &val); + ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val); check_warn_return(ret, "Error reading WUCSR"); val |= WUCSR_MPR_; - ret = smsc95xx_write_reg(dev, WUCSR, val); + ret = smsc95xx_write_reg_nopm(dev, WUCSR, val); check_warn_return(ret, "Error writing WUCSR"); } /* enable/disable wakeup sources */ - ret = smsc95xx_read_reg(dev, WUCSR, &val); + ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val); check_warn_return(ret, "Error reading WUCSR"); if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) { @@ -1194,41 +1230,41 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message) val &= ~WUCSR_MPEN_; } - ret = smsc95xx_write_reg(dev, WUCSR, val); + ret = smsc95xx_write_reg_nopm(dev, WUCSR, val); check_warn_return(ret, "Error writing WUCSR"); /* enable wol wakeup source */ - ret = smsc95xx_read_reg(dev, PM_CTRL, &val); + ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val); check_warn_return(ret, "Error reading PM_CTRL"); val |= PM_CTL_WOL_EN_; - ret = smsc95xx_write_reg(dev, PM_CTRL, val); + ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); check_warn_return(ret, "Error writing PM_CTRL"); /* enable receiver to enable frame reception */ - smsc95xx_start_rx_path(dev); + smsc95xx_start_rx_path(dev, 1); /* some wol options are enabled, so enter SUSPEND0 */ netdev_info(dev->net, "entering SUSPEND0 mode"); - ret = smsc95xx_read_reg(dev, PM_CTRL, &val); + ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val); check_warn_return(ret, "Error reading PM_CTRL"); val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_)); val |= PM_CTL_SUS_MODE_0; - ret = smsc95xx_write_reg(dev, PM_CTRL, val); + ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); check_warn_return(ret, "Error writing PM_CTRL"); /* clear wol status */ val &= ~PM_CTL_WUPS_; val |= PM_CTL_WUPS_WOL_; - ret = smsc95xx_write_reg(dev, PM_CTRL, val); + ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); check_warn_return(ret, "Error writing PM_CTRL"); /* read back PM_CTRL */ - ret = smsc95xx_read_reg(dev, PM_CTRL, &val); + ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val); check_warn_return(ret, "Error reading PM_CTRL"); smsc95xx_set_feature(dev, USB_DEVICE_REMOTE_WAKEUP); @@ -1249,22 +1285,22 @@ static int smsc95xx_resume(struct usb_interface *intf) smsc95xx_clear_feature(dev, USB_DEVICE_REMOTE_WAKEUP); /* clear wake-up sources */ - ret = smsc95xx_read_reg(dev, WUCSR, &val); + ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val); check_warn_return(ret, "Error reading WUCSR"); val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_); - ret = smsc95xx_write_reg(dev, WUCSR, val); + ret = smsc95xx_write_reg_nopm(dev, WUCSR, val); check_warn_return(ret, "Error writing WUCSR"); /* clear wake-up status */ - ret = smsc95xx_read_reg(dev, PM_CTRL, &val); + ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val); check_warn_return(ret, "Error reading PM_CTRL"); val &= ~PM_CTL_WOL_EN_; val |= PM_CTL_WUPS_; - ret = smsc95xx_write_reg(dev, PM_CTRL, val); + ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); check_warn_return(ret, "Error writing PM_CTRL"); } -- 2.20.1