6 files changed, 217 insertions, 47 deletions

diff --git a/drivers/net/wireless/zd1211rw/zd_chip.h b/drivers/net/wireless/zd1211rw/zd_chip.h
index 4be7c3b..117c412 100644
--- a/drivers/net/wireless/zd1211rw/zd_chip.h
+++ b/drivers/net/wireless/zd1211rw/zd_chip.h
@@ -21,6 +21,8 @@
 #ifndef _ZD_CHIP_H
 #define _ZD_CHIP_H
 
+#include <net/mac80211.h>
+
 #include "zd_rf.h"
 #include "zd_usb.h"
 
diff --git a/drivers/net/wireless/zd1211rw/zd_def.h b/drivers/net/wireless/zd1211rw/zd_def.h
index 5463ca9..9a1b013 100644
--- a/drivers/net/wireless/zd1211rw/zd_def.h
+++ b/drivers/net/wireless/zd1211rw/zd_def.h
@@ -37,9 +37,15 @@ typedef u16 __nocast zd_addr_t;
 	if (net_ratelimit()) \
 		dev_printk_f(KERN_DEBUG, dev, fmt, ## args); \
 } while (0)
+#  define dev_dbg_f_cond(dev, cond, fmt, args...) ({ \
+	bool __cond = !!(cond); \
+	if (unlikely(__cond)) \
+		dev_printk_f(KERN_DEBUG, dev, fmt, ## args); \
+})
 #else
 #  define dev_dbg_f(dev, fmt, args...) do { (void)(dev); } while (0)
 #  define dev_dbg_f_limit(dev, fmt, args...) do { (void)(dev); } while (0)
+#  define dev_dbg_f_cond(dev, cond, fmt, args...) do { (void)(dev); } while (0)
 #endif /* DEBUG */
 
 #ifdef DEBUG
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index 5037c8b..0a70149 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -143,7 +143,7 @@ static void beacon_enable(struct zd_mac *mac);
 static void beacon_disable(struct zd_mac *mac);
 static void set_rts_cts(struct zd_mac *mac, unsigned int short_preamble);
 static int zd_mac_config_beacon(struct ieee80211_hw *hw,
-				struct sk_buff *beacon);
+				struct sk_buff *beacon, bool in_intr);
 
 static int zd_reg2alpha2(u8 regdomain, char *alpha2)
 {
@@ -160,6 +160,22 @@ static int zd_reg2alpha2(u8 regdomain, char *alpha2)
 	return 1;
 }
 
+static int zd_check_signal(struct ieee80211_hw *hw, int signal)
+{
+	struct zd_mac *mac = zd_hw_mac(hw);
+
+	dev_dbg_f_cond(zd_mac_dev(mac), signal < 0 || signal > 100,
+			"%s: signal value from device not in range 0..100, "
+			"but %d.\n", __func__, signal);
+
+	if (signal < 0)
+		signal = 0;
+	else if (signal > 100)
+		signal = 100;
+
+	return signal;
+}
+
 int zd_mac_preinit_hw(struct ieee80211_hw *hw)
 {
 	int r;
@@ -387,10 +403,8 @@ int zd_restore_settings(struct zd_mac *mac)
 	    mac->type == NL80211_IFTYPE_AP) {
 		if (mac->vif != NULL) {
 			beacon = ieee80211_beacon_get(mac->hw, mac->vif);
-			if (beacon) {
-				zd_mac_config_beacon(mac->hw, beacon);
-				kfree_skb(beacon);
-			}
+			if (beacon)
+				zd_mac_config_beacon(mac->hw, beacon, false);
 		}
 
 		zd_set_beacon_interval(&mac->chip, beacon_interval,
@@ -461,7 +475,7 @@ static void zd_mac_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 	if (i<IEEE80211_TX_MAX_RATES)
 		info->status.rates[i].idx = -1; /* terminate */
 
-	info->status.ack_signal = ackssi;
+	info->status.ack_signal = zd_check_signal(hw, ackssi);
 	ieee80211_tx_status_irqsafe(hw, skb);
 }
 
@@ -664,7 +678,34 @@ static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 	/* FIXME: Management frame? */
 }
 
-static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon)
+static bool zd_mac_match_cur_beacon(struct zd_mac *mac, struct sk_buff *beacon)
+{
+	if (!mac->beacon.cur_beacon)
+		return false;
+
+	if (mac->beacon.cur_beacon->len != beacon->len)
+		return false;
+
+	return !memcmp(beacon->data, mac->beacon.cur_beacon->data, beacon->len);
+}
+
+static void zd_mac_free_cur_beacon_locked(struct zd_mac *mac)
+{
+	ZD_ASSERT(mutex_is_locked(&mac->chip.mutex));
+
+	kfree_skb(mac->beacon.cur_beacon);
+	mac->beacon.cur_beacon = NULL;
+}
+
+static void zd_mac_free_cur_beacon(struct zd_mac *mac)
+{
+	mutex_lock(&mac->chip.mutex);
+	zd_mac_free_cur_beacon_locked(mac);
+	mutex_unlock(&mac->chip.mutex);
+}
+
+static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon,
+				bool in_intr)
 {
 	struct zd_mac *mac = zd_hw_mac(hw);
 	int r, ret, num_cmds, req_pos = 0;
@@ -674,13 +715,21 @@ static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon)
 	unsigned long end_jiffies, message_jiffies;
 	struct zd_ioreq32 *ioreqs;
 
+	mutex_lock(&mac->chip.mutex);
+
+	/* Check if hw already has this beacon. */
+	if (zd_mac_match_cur_beacon(mac, beacon)) {
+		r = 0;
+		goto out_nofree;
+	}
+
 	/* Alloc memory for full beacon write at once. */
 	num_cmds = 1 + zd_chip_is_zd1211b(&mac->chip) + full_len;
 	ioreqs = kmalloc(num_cmds * sizeof(struct zd_ioreq32), GFP_KERNEL);
-	if (!ioreqs)
-		return -ENOMEM;
-
-	mutex_lock(&mac->chip.mutex);
+	if (!ioreqs) {
+		r = -ENOMEM;
+		goto out_nofree;
+	}
 
 	r = zd_iowrite32_locked(&mac->chip, 0, CR_BCN_FIFO_SEMAPHORE);
 	if (r < 0)
@@ -688,6 +737,10 @@ static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon)
 	r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
 	if (r < 0)
 		goto release_sema;
+	if (in_intr && tmp & 0x2) {
+		r = -EBUSY;
+		goto release_sema;
+	}
 
 	end_jiffies = jiffies + HZ / 2; /*~500ms*/
 	message_jiffies = jiffies + HZ / 10; /*~100ms*/
@@ -742,7 +795,7 @@ release_sema:
 	end_jiffies = jiffies + HZ / 2; /*~500ms*/
 	ret = zd_iowrite32_locked(&mac->chip, 1, CR_BCN_FIFO_SEMAPHORE);
 	while (ret < 0) {
-		if (time_is_before_eq_jiffies(end_jiffies)) {
+		if (in_intr || time_is_before_eq_jiffies(end_jiffies)) {
 			ret = -ETIMEDOUT;
 			break;
 		}
@@ -757,9 +810,19 @@ release_sema:
 	if (r < 0 || ret < 0) {
 		if (r >= 0)
 			r = ret;
+
+		/* We don't know if beacon was written successfully or not,
+		 * so clear current. */
+		zd_mac_free_cur_beacon_locked(mac);
+
 		goto out;
 	}
 
+	/* Beacon has now been written successfully, update current. */
+	zd_mac_free_cur_beacon_locked(mac);
+	mac->beacon.cur_beacon = beacon;
+	beacon = NULL;
+
 	/* 802.11b/g 2.4G CCK 1Mb
 	 * 802.11a, not yet implemented, uses different values (see GPL vendor
 	 * driver)
@@ -767,11 +830,17 @@ release_sema:
 	r = zd_iowrite32_locked(&mac->chip, 0x00000400 | (full_len << 19),
 				CR_BCN_PLCP_CFG);
 out:
-	mutex_unlock(&mac->chip.mutex);
 	kfree(ioreqs);
+out_nofree:
+	kfree_skb(beacon);
+	mutex_unlock(&mac->chip.mutex);
+
 	return r;
 
 reset_device:
+	zd_mac_free_cur_beacon_locked(mac);
+	kfree_skb(beacon);
+
 	mutex_unlock(&mac->chip.mutex);
 	kfree(ioreqs);
 
@@ -982,7 +1051,7 @@ int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length)
 
 	stats.freq = zd_channels[_zd_chip_get_channel(&mac->chip) - 1].center_freq;
 	stats.band = IEEE80211_BAND_2GHZ;
-	stats.signal = status->signal_strength;
+	stats.signal = zd_check_signal(hw, status->signal_strength);
 
 	rate = zd_rx_rate(buffer, status);
 
@@ -1057,6 +1126,8 @@ static void zd_op_remove_interface(struct ieee80211_hw *hw,
 	mac->vif = NULL;
 	zd_set_beacon_interval(&mac->chip, 0, 0, NL80211_IFTYPE_UNSPECIFIED);
 	zd_write_mac_addr(&mac->chip, NULL);
+
+	zd_mac_free_cur_beacon(mac);
 }
 
 static int zd_op_config(struct ieee80211_hw *hw, u32 changed)
@@ -1094,10 +1165,8 @@ static void zd_beacon_done(struct zd_mac *mac)
 	 * Fetch next beacon so that tim_count is updated.
 	 */
 	beacon = ieee80211_beacon_get(mac->hw, mac->vif);
-	if (beacon) {
-		zd_mac_config_beacon(mac->hw, beacon);
-		kfree_skb(beacon);
-	}
+	if (beacon)
+		zd_mac_config_beacon(mac->hw, beacon, true);
 
 	spin_lock_irq(&mac->lock);
 	mac->beacon.last_update = jiffies;
@@ -1222,9 +1291,8 @@ static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
 
 			if (beacon) {
 				zd_chip_disable_hwint(&mac->chip);
-				zd_mac_config_beacon(hw, beacon);
+				zd_mac_config_beacon(hw, beacon, false);
 				zd_chip_enable_hwint(&mac->chip);
-				kfree_skb(beacon);
 			}
 		}
 
@@ -1264,7 +1332,7 @@ static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
 	}
 }
 
-static u64 zd_op_get_tsf(struct ieee80211_hw *hw)
+static u64 zd_op_get_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
 	struct zd_mac *mac = zd_hw_mac(hw);
 	return zd_chip_get_tsf(&mac->chip);
@@ -1361,7 +1429,8 @@ static void beacon_watchdog_handler(struct work_struct *work)
 	spin_lock_irq(&mac->lock);
 	interval = mac->beacon.interval;
 	period = mac->beacon.period;
-	timeout = mac->beacon.last_update + msecs_to_jiffies(interval) + HZ;
+	timeout = mac->beacon.last_update +
+			msecs_to_jiffies(interval * 1024 / 1000) * 3;
 	spin_unlock_irq(&mac->lock);
 
 	if (interval > 0 && time_is_before_jiffies(timeout)) {
@@ -1374,8 +1443,9 @@ static void beacon_watchdog_handler(struct work_struct *work)
 
 		beacon = ieee80211_beacon_get(mac->hw, mac->vif);
 		if (beacon) {
-			zd_mac_config_beacon(mac->hw, beacon);
-			kfree_skb(beacon);
+			zd_mac_free_cur_beacon(mac);
+
+			zd_mac_config_beacon(mac->hw, beacon, false);
 		}
 
 		zd_set_beacon_interval(&mac->chip, interval, period, mac->type);
@@ -1410,6 +1480,8 @@ static void beacon_disable(struct zd_mac *mac)
 {
 	dev_dbg_f(zd_mac_dev(mac), "\n");
 	cancel_delayed_work_sync(&mac->beacon.watchdog_work);
+
+	zd_mac_free_cur_beacon(mac);
 }
 
 #define LINK_LED_WORK_DELAY HZ
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.h b/drivers/net/wireless/zd1211rw/zd_mac.h
index f8c93c3..c01eca8 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.h
+++ b/drivers/net/wireless/zd1211rw/zd_mac.h
@@ -165,6 +165,7 @@ struct housekeeping {
 
 struct beacon {
 	struct delayed_work watchdog_work;
+	struct sk_buff *cur_beacon;
 	unsigned long last_update;
 	u16 interval;
 	u8 period;
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.c b/drivers/net/wireless/zd1211rw/zd_usb.c
index 631194d..785bdbe 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zd1211rw/zd_usb.c
@@ -28,6 +28,7 @@
 #include <linux/skbuff.h>
 #include <linux/usb.h>
 #include <linux/workqueue.h>
+#include <linux/module.h>
 #include <net/mac80211.h>
 #include <asm/unaligned.h>
 
@@ -111,6 +112,9 @@ MODULE_DEVICE_TABLE(usb, usb_ids);
 #define FW_ZD1211_PREFIX	"zd1211/zd1211_"
 #define FW_ZD1211B_PREFIX	"zd1211/zd1211b_"
 
+static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
+			    unsigned int count);
+
 /* USB device initialization */
 static void int_urb_complete(struct urb *urb);
 
@@ -365,6 +369,20 @@ exit:
 
 #define urb_dev(urb) (&(urb)->dev->dev)
 
+static inline void handle_regs_int_override(struct urb *urb)
+{
+	struct zd_usb *usb = urb->context;
+	struct zd_usb_interrupt *intr = &usb->intr;
+
+	spin_lock(&intr->lock);
+	if (atomic_read(&intr->read_regs_enabled)) {
+		atomic_set(&intr->read_regs_enabled, 0);
+		intr->read_regs_int_overridden = 1;
+		complete(&intr->read_regs.completion);
+	}
+	spin_unlock(&intr->lock);
+}
+
 static inline void handle_regs_int(struct urb *urb)
 {
 	struct zd_usb *usb = urb->context;
@@ -383,25 +401,45 @@ static inline void handle_regs_int(struct urb *urb)
 				USB_MAX_EP_INT_BUFFER);
 		spin_unlock(&mac->lock);
 		schedule_work(&mac->process_intr);
-	} else if (intr->read_regs_enabled) {
-		intr->read_regs.length = len = urb->actual_length;
-
+	} else if (atomic_read(&intr->read_regs_enabled)) {
+		len = urb->actual_length;
+		intr->read_regs.length = urb->actual_length;
 		if (len > sizeof(intr->read_regs.buffer))
 			len = sizeof(intr->read_regs.buffer);
+
 		memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
-		intr->read_regs_enabled = 0;
+
+		/* Sometimes USB_INT_ID_REGS is not overridden, but comes after
+		 * USB_INT_ID_RETRY_FAILED. Read-reg retry then gets this
+		 * delayed USB_INT_ID_REGS, but leaves USB_INT_ID_REGS of
+		 * retry unhandled. Next read-reg command then might catch
+		 * this wrong USB_INT_ID_REGS. Fix by ignoring wrong reads.
+		 */
+		if (!check_read_regs(usb, intr->read_regs.req,
+						intr->read_regs.req_count))
+			goto out;
+
+		atomic_set(&intr->read_regs_enabled, 0);
+		intr->read_regs_int_overridden = 0;
 		complete(&intr->read_regs.completion);
+
 		goto out;
 	}
 
 out:
 	spin_unlock(&intr->lock);
+
+	/* CR_INTERRUPT might override read_reg too. */
+	if (int_num == CR_INTERRUPT && atomic_read(&intr->read_regs_enabled))
+		handle_regs_int_override(urb);
 }
 
 static void int_urb_complete(struct urb *urb)
 {
 	int r;
 	struct usb_int_header *hdr;
+	struct zd_usb *usb;
+	struct zd_usb_interrupt *intr;
 
 	switch (urb->status) {
 	case 0:
@@ -430,6 +468,14 @@ static void int_urb_complete(struct urb *urb)
 		goto resubmit;
 	}
 
+	/* USB_INT_ID_RETRY_FAILED triggered by tx-urb submit can override
+	 * pending USB_INT_ID_REGS causing read command timeout.
+	 */
+	usb = urb->context;
+	intr = &usb->intr;
+	if (hdr->id != USB_INT_ID_REGS && atomic_read(&intr->read_regs_enabled))
+		handle_regs_int_override(urb);
+
 	switch (hdr->id) {
 	case USB_INT_ID_REGS:
 		handle_regs_int(urb);
@@ -579,8 +625,8 @@ static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
 
 	if (length < sizeof(struct rx_length_info)) {
 		/* It's not a complete packet anyhow. */
-		printk("%s: invalid, small RX packet : %d\n",
-		       __func__, length);
+		dev_dbg_f(zd_usb_dev(usb), "invalid, small RX packet : %d\n",
+					   length);
 		return;
 	}
 	length_info = (struct rx_length_info *)
@@ -1129,6 +1175,7 @@ static inline void init_usb_interrupt(struct zd_usb *usb)
 	spin_lock_init(&intr->lock);
 	intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
 	init_completion(&intr->read_regs.completion);
+	atomic_set(&intr->read_regs_enabled, 0);
 	intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
 }
 
@@ -1563,12 +1610,16 @@ static int usb_int_regs_length(unsigned int count)
 	return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
 }
 
-static void prepare_read_regs_int(struct zd_usb *usb)
+static void prepare_read_regs_int(struct zd_usb *usb,
+				  struct usb_req_read_regs *req,
+				  unsigned int count)
 {
 	struct zd_usb_interrupt *intr = &usb->intr;
 
 	spin_lock_irq(&intr->lock);
-	intr->read_regs_enabled = 1;
+	atomic_set(&intr->read_regs_enabled, 1);
+	intr->read_regs.req = req;
+	intr->read_regs.req_count = count;
 	INIT_COMPLETION(intr->read_regs.completion);
 	spin_unlock_irq(&intr->lock);
 }
@@ -1578,22 +1629,18 @@ static void disable_read_regs_int(struct zd_usb *usb)
 	struct zd_usb_interrupt *intr = &usb->intr;
 
 	spin_lock_irq(&intr->lock);
-	intr->read_regs_enabled = 0;
+	atomic_set(&intr->read_regs_enabled, 0);
 	spin_unlock_irq(&intr->lock);
 }
 
-static int get_results(struct zd_usb *usb, u16 *values,
-	               struct usb_req_read_regs *req, unsigned int count)
+static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
+			    unsigned int count)
 {
-	int r;
 	int i;
 	struct zd_usb_interrupt *intr = &usb->intr;
 	struct read_regs_int *rr = &intr->read_regs;
 	struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
 
-	spin_lock_irq(&intr->lock);
-
-	r = -EIO;
 	/* The created block size seems to be larger than expected.
 	 * However results appear to be correct.
 	 */
@@ -1601,13 +1648,14 @@ static int get_results(struct zd_usb *usb, u16 *values,
 		dev_dbg_f(zd_usb_dev(usb),
 			 "error: actual length %d less than expected %d\n",
 			 rr->length, usb_int_regs_length(count));
-		goto error_unlock;
+		return false;
 	}
+
 	if (rr->length > sizeof(rr->buffer)) {
 		dev_dbg_f(zd_usb_dev(usb),
 			 "error: actual length %d exceeds buffer size %zu\n",
 			 rr->length, sizeof(rr->buffer));
-		goto error_unlock;
+		return false;
 	}
 
 	for (i = 0; i < count; i++) {
@@ -1617,8 +1665,39 @@ static int get_results(struct zd_usb *usb, u16 *values,
 				 "rd[%d] addr %#06hx expected %#06hx\n", i,
 				 le16_to_cpu(rd->addr),
 				 le16_to_cpu(req->addr[i]));
-			goto error_unlock;
+			return false;
 		}
+	}
+
+	return true;
+}
+
+static int get_results(struct zd_usb *usb, u16 *values,
+		       struct usb_req_read_regs *req, unsigned int count,
+		       bool *retry)
+{
+	int r;
+	int i;
+	struct zd_usb_interrupt *intr = &usb->intr;
+	struct read_regs_int *rr = &intr->read_regs;
+	struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
+
+	spin_lock_irq(&intr->lock);
+
+	r = -EIO;
+
+	/* Read failed because firmware bug? */
+	*retry = !!intr->read_regs_int_overridden;
+	if (*retry)
+		goto error_unlock;
+
+	if (!check_read_regs(usb, req, count)) {
+		dev_dbg_f(zd_usb_dev(usb), "error: invalid read regs\n");
+		goto error_unlock;
+	}
+
+	for (i = 0; i < count; i++) {
+		struct reg_data *rd = &regs->regs[i];
 		values[i] = le16_to_cpu(rd->value);
 	}
 
@@ -1631,11 +1710,11 @@ error_unlock:
 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
 	             const zd_addr_t *addresses, unsigned int count)
 {
-	int r;
-	int i, req_len, actual_req_len;
+	int r, i, req_len, actual_req_len, try_count = 0;
 	struct usb_device *udev;
 	struct usb_req_read_regs *req = NULL;
 	unsigned long timeout;
+	bool retry = false;
 
 	if (count < 1) {
 		dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
@@ -1671,8 +1750,10 @@ int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
 	for (i = 0; i < count; i++)
 		req->addr[i] = cpu_to_le16((u16)addresses[i]);
 
+retry_read:
+	try_count++;
 	udev = zd_usb_to_usbdev(usb);
-	prepare_read_regs_int(usb);
+	prepare_read_regs_int(usb, req, count);
 	r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/);
 	if (r) {
 		dev_dbg_f(zd_usb_dev(usb),
@@ -1696,7 +1777,12 @@ int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
 		goto error;
 	}
 
-	r = get_results(usb, values, req, count);
+	r = get_results(usb, values, req, count, &retry);
+	if (retry && try_count < 20) {
+		dev_dbg_f(zd_usb_dev(usb), "read retry, tries so far: %d\n",
+				try_count);
+		goto retry_read;
+	}
 error:
 	return r;
 }
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.h b/drivers/net/wireless/zd1211rw/zd_usb.h
index bf94284..99193b4 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.h
+++ b/drivers/net/wireless/zd1211rw/zd_usb.h
@@ -144,6 +144,8 @@ struct usb_int_retry_fail {
 
 struct read_regs_int {
 	struct completion completion;
+	struct usb_req_read_regs *req;
+	unsigned int req_count;
 	/* Stores the USB int structure and contains the USB address of the
 	 * first requested register before request.
 	 */
@@ -169,7 +171,8 @@ struct zd_usb_interrupt {
 	void *buffer;
 	dma_addr_t buffer_dma;
 	int interval;
-	u8 read_regs_enabled:1;
+	atomic_t read_regs_enabled;
+	u8 read_regs_int_overridden:1;
 };
 
 static inline struct usb_int_regs *get_read_regs(struct zd_usb_interrupt *intr)