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Message-ID: <4f034b6c.ypfAbSdXSgMHtfqa%Larry.Finger@lwfinger.net>
Date: Tue, 03 Jan 2012 12:39:40 -0600
From: Larry Finger <Larry.Finger@...inger.net>
To: John W Linville <linville@...driver.com>,
torvalds@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, chaoming_li@...lsil.com.cn,
linux-wireless@...r.kernel.org
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 <bugzilla@...egypt.net>
Reported-by: Dave Jones <davej@...hat.com>
Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Stable <stable@...r.kernel.org>
---
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@...ltek.com>");
MODULE_AUTHOR("Ziv Huang <ziv_huang@...ltek.com>");
@@ -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,
--
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