This patch addresses two recent mail threads. The first, which was on LKML (http://lkml.indiana.edu/hypermail/linux/kernel/1112.3/00965.html) was for a WARNING that occurs after a suspend/resume cycle for rtl8192cu.
The scond mail thread (http://marc.info/?l=linux-wireless&m=132655490826766&w=2) concerned changes in udev that break drivers that delay while firmware is loaded on modprobe. This patch converts all rtlwifi-based drivers to use the asynchronous firmware loading mechanism. A completion queue entry is inititialized and the firmware load is started with the device initialization. The firmware-loaded callback routine issues a complete() call. The routine that uploads firmware to the device calls wait_for_completion_interruptible_timeout() with a 5 sec timeout. The current patch is working, but as this is my first usage of the completion mechanism, I would like an expert to look it over. In particular, is it sufficient and prudent to issue a complete() call when the driver is unloaded so as to not leave a queue entry when the underlying struct is destroyed? For the purists, yes, I know this is not a proper commit message. I will supply one when the patch is actually submitted. Signed-off-by: Larry Finger <[email protected]> --- Index: wireless-testing-new/drivers/net/wireless/rtlwifi/pci.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/pci.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/pci.c @@ -1777,6 +1777,7 @@ int __devinit rtl_pci_probe(struct pci_d pci_set_drvdata(pdev, hw); rtlpriv = hw->priv; + init_completion(&rtlpriv->firmware_load_complete); pcipriv = (void *)rtlpriv->priv; pcipriv->dev.pdev = pdev; @@ -1925,6 +1926,9 @@ void rtl_pci_disconnect(struct pci_dev * struct rtl_pci *rtlpci = rtl_pcidev(pcipriv); struct rtl_mac *rtlmac = rtl_mac(rtlpriv); + /* Just in case fw load has not completed */ + complete(&rtlpriv->firmware_load_complete); + clear_bit(RTL_STATUS_INTERFACE_START, &rtlpriv->status); sysfs_remove_group(&pdev->dev.kobj, &rtl_attribute_group); Index: wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c @@ -257,10 +257,17 @@ int rtl92c_download_fw(struct ieee80211_ u32 fwsize; enum version_8192c version = rtlhal->version; - if (!rtlhal->pfirmware) + /* hold at this point until firmware is available */ + if (!wait_for_completion_interruptible_timeout( + &rtlpriv->firmware_load_complete, HZ)) { + pr_err("Wait_for_completion timed out\n"); + complete(&rtlpriv->firmware_load_complete); + return 1; + } + + if (rtlpriv->max_fw_size == 0 || !rtlhal->pfirmware) return 1; - pr_info("Loading firmware file %s\n", rtlpriv->cfg->fw_name); pfwheader = (struct rtl92c_firmware_header *)rtlhal->pfirmware; pfwdata = (u8 *) rtlhal->pfirmware; fwsize = rtlhal->fwsize; Index: wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c @@ -91,9 +91,7 @@ int rtl92c_init_sw_vars(struct ieee80211 int err; struct rtl_priv *rtlpriv = rtl_priv(hw); struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw)); - const struct firmware *firmware; struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw)); - char *fw_name = NULL; rtl8192ce_bt_reg_init(hw); @@ -165,26 +163,20 @@ int rtl92c_init_sw_vars(struct ieee80211 /* request fw */ if (IS_VENDOR_UMC_A_CUT(rtlhal->version) && !IS_92C_SERIAL(rtlhal->version)) - fw_name = "rtlwifi/rtl8192cfwU.bin"; + rtlpriv->cfg->fw_name = "rtlwifi/rtl8192cfwU.bin"; else if (IS_81xxC_VENDOR_UMC_B_CUT(rtlhal->version)) - fw_name = "rtlwifi/rtl8192cfwU_B.bin"; - else - fw_name = rtlpriv->cfg->fw_name; - err = request_firmware(&firmware, fw_name, rtlpriv->io.dev); + rtlpriv->cfg->fw_name = "rtlwifi/rtl8192cfwU_B.bin"; + + rtlpriv->max_fw_size = 0x4000; + pr_info("Using firmware %s\n", rtlpriv->cfg->fw_name); + err = request_firmware_nowait(THIS_MODULE, 1, rtlpriv->cfg->fw_name, + rtlpriv->io.dev, GFP_KERNEL, hw, + rtl_fw_cb); if (err) { RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, "Failed to request firmware!\n"); return 1; } - if (firmware->size > 0x4000) { - RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, - "Firmware is too big!\n"); - release_firmware(firmware); - return 1; - } - memcpy(rtlpriv->rtlhal.pfirmware, firmware->data, firmware->size); - rtlpriv->rtlhal.fwsize = firmware->size; - release_firmware(firmware); return 0; } Index: wireless-testing-new/drivers/net/wireless/rtlwifi/wifi.h =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/wifi.h +++ wireless-testing-new/drivers/net/wireless/rtlwifi/wifi.h @@ -37,6 +37,7 @@ #include <linux/etherdevice.h> #include <linux/vmalloc.h> #include <linux/usb.h> +#include <linux/completion.h> #include <net/mac80211.h> #include "debug.h" @@ -1614,6 +1615,8 @@ struct rtl_priv { struct rtl_rate_priv *rate_priv; struct rtl_debug dbg; + struct completion firmware_load_complete; + int max_fw_size; /* *hal_cfg : for diff cards Index: wireless-testing-new/drivers/net/wireless/rtlwifi/core.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/core.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/core.c @@ -33,6 +33,31 @@ #include "base.h" #include "ps.h" +#include <linux/export.h> + +void rtl_fw_cb(const struct firmware *firmware, void *context) +{ + struct ieee80211_hw *hw = context; + struct rtl_priv *rtlpriv = rtl_priv(hw); + + complete(&rtlpriv->firmware_load_complete); + if (!firmware) { + pr_err("Firmware %s not available\n", rtlpriv->cfg->fw_name); + rtlpriv->max_fw_size = 0; + return; + } + if (firmware->size > rtlpriv->max_fw_size) { + RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, + "Firmware is too big!\n"); + release_firmware(firmware); + return; + } + memcpy(rtlpriv->rtlhal.pfirmware, firmware->data, firmware->size); + rtlpriv->rtlhal.fwsize = firmware->size; + release_firmware(firmware); +} +EXPORT_SYMBOL(rtl_fw_cb); + /*mutex for start & stop is must here. */ static int rtl_op_start(struct ieee80211_hw *hw) { Index: wireless-testing-new/drivers/net/wireless/rtlwifi/core.h =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/core.h +++ wireless-testing-new/drivers/net/wireless/rtlwifi/core.h @@ -40,4 +40,6 @@ #define RTL_SUPPORTED_CTRL_FILTER 0xFF extern const struct ieee80211_ops rtl_ops; +void rtl_fw_cb(const struct firmware *firmware, void *context); + #endif Index: wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c @@ -53,7 +53,6 @@ MODULE_FIRMWARE("rtlwifi/rtl8192cufw.bin static int rtl92cu_init_sw_vars(struct ieee80211_hw *hw) { struct rtl_priv *rtlpriv = rtl_priv(hw); - const struct firmware *firmware; int err; rtlpriv->dm.dm_initialgain_enable = 1; @@ -61,29 +60,21 @@ static int rtl92cu_init_sw_vars(struct i rtlpriv->dm.disable_framebursting = 0; rtlpriv->dm.thermalvalue = 0; rtlpriv->dbg.global_debuglevel = rtlpriv->cfg->mod_params->debug; - rtlpriv->rtlhal.pfirmware = vmalloc(0x4000); + + /* for firmware buf */ + rtlpriv->rtlhal.pfirmware = vzalloc(0x4000); if (!rtlpriv->rtlhal.pfirmware) { RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, "Can't alloc buffer for fw\n"); return 1; } - /* request fw */ - err = request_firmware(&firmware, rtlpriv->cfg->fw_name, - rtlpriv->io.dev); - if (err) { - RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, - "Failed to request firmware!\n"); - return 1; - } - if (firmware->size > 0x4000) { - RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, - "Firmware is too big!\n"); - release_firmware(firmware); - return 1; - } - memcpy(rtlpriv->rtlhal.pfirmware, firmware->data, firmware->size); - rtlpriv->rtlhal.fwsize = firmware->size; - release_firmware(firmware); + + pr_info("Loading firmware %s\n", rtlpriv->cfg->fw_name); + rtlpriv->max_fw_size = 0x4000; + err = request_firmware_nowait(THIS_MODULE, 1, + rtlpriv->cfg->fw_name, rtlpriv->io.dev, + GFP_KERNEL, hw, rtl_fw_cb); + return 0; } Index: wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192se/sw.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/rtl8192se/sw.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192se/sw.c @@ -86,12 +86,34 @@ static void rtl92s_init_aspm_vars(struct rtlpci->const_support_pciaspm = 2; } +static void rtl92se_fw_cb(const struct firmware *firmware, void *context) +{ + struct ieee80211_hw *hw = context; + struct rtl_priv *rtlpriv = rtl_priv(hw); + struct rt_firmware *pfirmware = NULL; + + complete(&rtlpriv->firmware_load_complete); + if (!firmware) { + pr_err("Firmware not available\n"); + rtlpriv->max_fw_size = 0; + return; + } + if (firmware->size > rtlpriv->max_fw_size) { + RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, + "Firmware is too big!\n"); + release_firmware(firmware); + return; + } + pfirmware = (struct rt_firmware *)rtlpriv->rtlhal.pfirmware; + memcpy(pfirmware->sz_fw_tmpbuffer, firmware->data, firmware->size); + pfirmware->sz_fw_tmpbufferlen = firmware->size; + release_firmware(firmware); +} + static int rtl92s_init_sw_vars(struct ieee80211_hw *hw) { struct rtl_priv *rtlpriv = rtl_priv(hw); struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw)); - const struct firmware *firmware; - struct rt_firmware *pfirmware = NULL; int err = 0; u16 earlyrxthreshold = 7; @@ -189,27 +211,18 @@ static int rtl92s_init_sw_vars(struct ie return 1; } + rtlpriv->max_fw_size = sizeof(struct rt_firmware); pr_info("Driver for Realtek RTL8192SE/RTL8191SE\n" "Loading firmware %s\n", rtlpriv->cfg->fw_name); /* request fw */ - err = request_firmware(&firmware, rtlpriv->cfg->fw_name, - rtlpriv->io.dev); + err = request_firmware_nowait(THIS_MODULE, 1, rtlpriv->cfg->fw_name, + rtlpriv->io.dev, GFP_KERNEL, hw, + rtl92se_fw_cb); if (err) { RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, "Failed to request firmware!\n"); return 1; } - if (firmware->size > sizeof(struct rt_firmware)) { - RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, - "Firmware is too big!\n"); - release_firmware(firmware); - return 1; - } - - pfirmware = (struct rt_firmware *)rtlpriv->rtlhal.pfirmware; - memcpy(pfirmware->sz_fw_tmpbuffer, firmware->data, firmware->size); - pfirmware->sz_fw_tmpbufferlen = firmware->size; - release_firmware(firmware); return err; } Index: wireless-testing-new/drivers/net/wireless/rtlwifi/usb.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/usb.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/usb.c @@ -664,15 +664,17 @@ static int rtl_usb_start(struct ieee8021 struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw)); err = rtlpriv->cfg->ops->hw_init(hw); - rtl_init_rx_config(hw); + if (!err) { + rtl_init_rx_config(hw); - /* Enable software */ - SET_USB_START(rtlusb); - /* should after adapter start and interrupt enable. */ - set_hal_start(rtlhal); + /* Enable software */ + SET_USB_START(rtlusb); + /* should after adapter start and interrupt enable. */ + set_hal_start(rtlhal); - /* Start bulk IN */ - _rtl_usb_receive(hw); + /* Start bulk IN */ + _rtl_usb_receive(hw); + } return err; } @@ -949,6 +951,7 @@ int __devinit rtl_usb_probe(struct usb_i return -ENOMEM; } rtlpriv = hw->priv; + init_completion(&rtlpriv->firmware_load_complete); SET_IEEE80211_DEV(hw, &intf->dev); udev = interface_to_usbdev(intf); usb_get_dev(udev); @@ -1013,6 +1016,9 @@ void rtl_usb_disconnect(struct usb_inter if (unlikely(!rtlpriv)) return; + /* In case firmware load has not yet completed, force completion here */ + complete(&rtlpriv->firmware_load_complete); + /*ieee80211_unregister_hw will call ops_stop */ if (rtlmac->mac80211_registered == 1) { ieee80211_unregister_hw(hw); Index: wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192de/sw.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/rtl8192de/sw.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192de/sw.c @@ -91,7 +91,6 @@ static int rtl92d_init_sw_vars(struct ie u8 tid; struct rtl_priv *rtlpriv = rtl_priv(hw); struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw)); - const struct firmware *firmware; static int header_print; rtlpriv->dm.dm_initialgain_enable = true; @@ -167,6 +166,15 @@ static int rtl92d_init_sw_vars(struct ie else if (rtlpriv->psc.reg_fwctrl_lps == 3) rtlpriv->psc.fwctrl_psmode = FW_PS_DTIM_MODE; + /* for early mode */ + rtlpriv->rtlhal.earlymode_enable = true; + for (tid = 0; tid < 8; tid++) + skb_queue_head_init(&rtlpriv->mac80211.skb_waitq[tid]); + + /* Only load firmware for first MAC */ + if (header_print) + return 0; + /* for firmware buf */ rtlpriv->rtlhal.pfirmware = vzalloc(0x8000); if (!rtlpriv->rtlhal.pfirmware) { @@ -175,33 +183,21 @@ static int rtl92d_init_sw_vars(struct ie return 1; } - if (!header_print) { - pr_info("Driver for Realtek RTL8192DE WLAN interface\n"); - pr_info("Loading firmware file %s\n", rtlpriv->cfg->fw_name); - header_print++; - } + rtlpriv->max_fw_size = 0x8000; + pr_info("Driver for Realtek RTL8192DE WLAN interface\n"); + pr_info("Loading firmware file %s\n", rtlpriv->cfg->fw_name); + header_print++; + /* request fw */ - err = request_firmware(&firmware, rtlpriv->cfg->fw_name, - rtlpriv->io.dev); + err = request_firmware_nowait(THIS_MODULE, 1, rtlpriv->cfg->fw_name, + rtlpriv->io.dev, GFP_KERNEL, hw, + rtl_fw_cb); if (err) { RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, "Failed to request firmware!\n"); return 1; } - if (firmware->size > 0x8000) { - RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG, - "Firmware is too big!\n"); - release_firmware(firmware); - return 1; - } - memcpy(rtlpriv->rtlhal.pfirmware, firmware->data, firmware->size); - rtlpriv->rtlhal.fwsize = firmware->size; - release_firmware(firmware); - /* for early mode */ - rtlpriv->rtlhal.earlymode_enable = true; - for (tid = 0; tid < 8; tid++) - skb_queue_head_init(&rtlpriv->mac80211.skb_waitq[tid]); return 0; } Index: wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192de/fw.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/rtl8192de/fw.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192de/fw.c @@ -253,7 +253,10 @@ int rtl92d_download_fw(struct ieee80211_ bool fw_downloaded = false, fwdl_in_process = false; unsigned long flags; - if (!rtlhal->pfirmware) + /* hold at this point until firmware is available */ + wait_for_completion_interruptible(&rtlpriv->firmware_load_complete); + + if (rtlpriv->max_fw_size == 0 || !rtlhal->pfirmware) return 1; fwsize = rtlhal->fwsize; pfwheader = (u8 *) rtlhal->pfirmware; Index: wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192se/fw.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/rtl8192se/fw.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192se/fw.c @@ -364,7 +364,10 @@ int rtl92s_download_fw(struct ieee80211_ u8 fwstatus = FW_STATUS_INIT; bool rtstatus = true; - if (!rtlhal->pfirmware) + /* hold at this point until firmware is available */ + wait_for_completion_interruptible(&rtlpriv->firmware_load_complete); + + if (rtlpriv->max_fw_size == 0 || !rtlhal->pfirmware) return 1; firmware = (struct rt_firmware *)rtlhal->pfirmware; Index: wireless-testing-new/drivers/net/wireless/rtlwifi/ps.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/ps.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/ps.c @@ -47,7 +47,8 @@ bool rtl_ps_enable_nic(struct ieee80211_ "Driver is already down!\n"); /*<2> Enable Adapter */ - rtlpriv->cfg->ops->hw_init(hw); + if (rtlpriv->cfg->ops->hw_init(hw)) + return 1; RT_CLEAR_PS_LEVEL(ppsc, RT_RF_OFF_LEVL_HALT_NIC); /*<3> Enable Interrupt */ Index: wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192se/hw.c =================================================================== --- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/rtl8192se/hw.c +++ wireless-testing-new/drivers/net/wireless/rtlwifi/rtl8192se/hw.c @@ -949,8 +949,10 @@ int rtl92se_hw_init(struct ieee80211_hw rtstatus = rtl92s_download_fw(hw); if (!rtstatus) { RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING, - "Failed to download FW. Init HW without FW now... Please copy FW into /lib/firmware/rtlwifi\n"); + "Failed to download FW. Init HW without FW now... " + "Please copy FW into /lib/firmware/rtlwifi\n"); rtlhal->fw_ready = false; + return 1; } else { rtlhal->fw_ready = true; } _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
