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 <bugzilla@xxxxxxxxxxxx> Reported-by: Dave Jones <davej@xxxxxxxxxx> Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Stable <stable@xxxxxxxxxxxxxxx> --- John/Linus, This patch should be pushed in V3.2 (if possible). There will be similar patches for rtl8192{ce,se,de}, but as they do not trigger a warning, I'll save them for later. Larry --- 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 @@ -265,7 +265,6 @@ int rtl92c_download_fw(struct ieee80211_ if (!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 @@ -186,6 +186,7 @@ int rtl92c_init_sw_vars(struct ieee80211 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; } 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 @@ -43,6 +43,8 @@ #include "hw.h" #include <linux/vmalloc.h> #include <linux/module.h> +#include <linux/atomic.h> +#include <linux/types.h> MODULE_AUTHOR("Georgia <georgia@xxxxxxxxxxx>"); MODULE_AUTHOR("Ziv Huang <ziv_huang@xxxxxxxxxxx>"); @@ -51,6 +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); @@ -62,12 +68,21 @@ 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); - 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); @@ -82,9 +97,14 @@ static int rtl92cu_init_sw_vars(struct i 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; } @@ -93,12 +113,30 @@ static void rtl92cu_deinit_sw_vars(struc { 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 +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, @@ -375,9 +413,9 @@ static struct usb_driver rtl8192cu_drive .id_table = rtl8192c_usb_ids, #ifdef CONFIG_PM - /* .suspend = rtl_usb_suspend, */ - /* .resume = rtl_usb_resume, */ - /* .reset_resume = rtl8192c_resume, */ + .suspend = rtl8192cu_usb_suspend, + .resume = rtl8192cu_usb_resume, + .reset_resume = rtl8192cu_usb_resume, #endif /* CONFIG_PM */ #ifdef CONFIG_AUTOSUSPEND .supports_autosuspend = 1, -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
