From e234ca17f2d5ce23606fceef2df6c02f8555547e Mon Sep 17 00:00:00 2001 From: Josh Boyer Date: Wed, 11 Jan 2012 13:35:33 -0500 Subject: [PATCH] rtl8192cu: Fix WARNING on suspend/resume A recent LKML thread (http://lkml.indiana.edu/hypermail/linux/kernel/1112.3/00965.html) discusses warnings that occur during a suspend/resume cycle. The driver attempts to read the firmware file before userspace is ready, leading to the following warning: WARNING: at drivers/base/firmware_class.c:537 _request_firmware+0x3f6/0x420() For rtl8192cu, the problem is fixed by storing the firmware in a global buffer rather than one allocated per device. The usage count is increased when suspending and decreased when resuming. This way, the firmware is retained through a suspend/resume cycle, and does not have to be reread. This patch should fix the bug reported in https://bugzilla.redhat.com/show_bug.cgi?id=771002. Note: This patch also touches rtl8192ce as the "firmware" loaded message is now printed in the wrong place. Reported-by: Mohammed Arafa Reported-by: Dave Jones Signed-off-by: Larry Finger Cc: Linus Torvalds Cc: Stable Backported to Fedora 3.1.x. --- drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c | 1 - drivers/net/wireless/rtlwifi/rtl8192ce/sw.c | 1 + drivers/net/wireless/rtlwifi/rtl8192cu/sw.c | 58 +++++++++++++++++---- 3 files changed, 49 insertions(+), 11 deletions(-) diff --git a/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c b/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c index 49a064b..e3c4ac7 100644 --- a/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c +++ b/drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c @@ -226,7 +226,6 @@ int rtl92c_download_fw(struct ieee80211_hw *hw) u32 fwsize; enum version_8192c version = rtlhal->version; - pr_info("Loading firmware file %s\n", rtlpriv->cfg->fw_name); if (!rtlhal->pfirmware) return 1; diff --git a/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c b/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c index 373dc78..9c3a8f1 100644 --- a/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c +++ b/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c @@ -171,6 +171,7 @@ int rtl92c_init_sw_vars(struct ieee80211_hw *hw) memcpy(rtlpriv->rtlhal.pfirmware, firmware->data, firmware->size); rtlpriv->rtlhal.fwsize = firmware->size; release_firmware(firmware); + pr_info("rtl8192ce: Loaded firmware file %s\n", rtlpriv->cfg->fw_name); return 0; } diff --git a/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c b/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c index ef63c0d..f4230dd 100644 --- a/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c +++ b/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c @@ -42,6 +42,9 @@ #include "led.h" #include "hw.h" #include +#include +#include + MODULE_AUTHOR("Georgia "); MODULE_AUTHOR("Ziv Huang "); @@ -50,6 +53,10 @@ MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Realtek 8192C/8188C 802.11n USB wireless"); MODULE_FIRMWARE("rtlwifi/rtl8192cufw.bin"); +static char *rtl8192cu_firmware; /* pointer to firmware */ +static int firmware_size; +static atomic_t usage_count; + static int rtl92cu_init_sw_vars(struct ieee80211_hw *hw) { struct rtl_priv *rtlpriv = rtl_priv(hw); @@ -60,12 +67,21 @@ static int rtl92cu_init_sw_vars(struct ieee80211_hw *hw) rtlpriv->dm.dm_flag = 0; rtlpriv->dm.disable_framebursting = 0; rtlpriv->dm.thermalvalue = 0; - rtlpriv->rtlhal.pfirmware = vmalloc(0x4000); - if (!rtlpriv->rtlhal.pfirmware) { + + if (rtl8192cu_firmware) { + /* firmware already loaded - true for suspend/resume + * and multiple instances of the device */ + rtlpriv->rtlhal.pfirmware = rtl8192cu_firmware; + rtlpriv->rtlhal.fwsize = firmware_size; + return 0; + } + rtl8192cu_firmware = vzalloc(0x4000); + if (!rtl8192cu_firmware) { 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); @@ -80,9 +96,14 @@ static int rtl92cu_init_sw_vars(struct ieee80211_hw *hw) release_firmware(firmware); return 1; } - memcpy(rtlpriv->rtlhal.pfirmware, firmware->data, firmware->size); + pr_info("rtl8192cu: Loaded firmware from file %s\n", + rtlpriv->cfg->fw_name); + memcpy(rtl8192cu_firmware, firmware->data, firmware->size); + firmware_size = firmware->size; rtlpriv->rtlhal.fwsize = firmware->size; + rtlpriv->rtlhal.pfirmware = rtl8192cu_firmware; release_firmware(firmware); + atomic_inc(&usage_count); return 0; } @@ -91,12 +112,30 @@ static void rtl92cu_deinit_sw_vars(struct ieee80211_hw *hw) { struct rtl_priv *rtlpriv = rtl_priv(hw); - if (rtlpriv->rtlhal.pfirmware) { - vfree(rtlpriv->rtlhal.pfirmware); + atomic_dec(&usage_count); + if (!atomic_read(&usage_count) && rtlpriv->rtlhal.pfirmware) { + vfree(rtl8192cu_firmware); + rtl8192cu_firmware = NULL; rtlpriv->rtlhal.pfirmware = NULL; } } +#ifdef CONFIG_PM_SLEEP +static int rtl8192cu_usb_suspend(struct usb_interface *pusb_intf, + pm_message_t message) +{ + /* Increase usage_count to Save loaded fw across suspend/resume */ + atomic_inc(&usage_count); + return 0; +} + +static int rtl8192cu_usb_resume(struct usb_interface *pusb_intf) +{ + atomic_dec(&usage_count); /* after resume, decrease usage count */ + return 0; +} +#endif + static struct rtl_hal_ops rtl8192cu_hal_ops = { .init_sw_vars = rtl92cu_init_sw_vars, .deinit_sw_vars = rtl92cu_deinit_sw_vars, @@ -338,11 +377,10 @@ static struct usb_driver rtl8192cu_driver = { .disconnect = rtl_usb_disconnect, .id_table = rtl8192c_usb_ids, -#ifdef CONFIG_PM - /* .suspend = rtl_usb_suspend, */ - /* .resume = rtl_usb_resume, */ - /* .reset_resume = rtl8192c_resume, */ -#endif /* CONFIG_PM */ +#ifdef CONFIG_PM_SLEEP + .suspend = rtl8192cu_usb_suspend, + .resume = rtl8192cu_usb_resume, +#endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_AUTOSUSPEND .supports_autosuspend = 1, #endif -- 1.7.7.5