1 files changed, 18 insertions, 31 deletions

diff --git a/drivers/usb/host/whci/pzl.c b/drivers/usb/host/whci/pzl.c
index 8d62df0..2ae5abf 100644
--- a/drivers/usb/host/whci/pzl.c
+++ b/drivers/usb/host/whci/pzl.c
@@ -19,35 +19,11 @@
 #include <linux/dma-mapping.h>
 #include <linux/uwb/umc.h>
 #include <linux/usb.h>
-#define D_LOCAL 0
-#include <linux/uwb/debug.h>
 
 #include "../../wusbcore/wusbhc.h"
 
 #include "whcd.h"
 
-#if D_LOCAL >= 4
-static void dump_pzl(struct whc *whc, const char *tag)
-{
-	struct device *dev = &whc->umc->dev;
-	struct whc_qset *qset;
-	int period = 0;
-
-	d_printf(4, dev, "PZL %s\n", tag);
-
-	for (period = 0; period < 5; period++) {
-		d_printf(4, dev, "Period %d\n", period);
-		list_for_each_entry(qset, &whc->periodic_list[period], list_node) {
-			dump_qset(qset, dev);
-		}
-	}
-}
-#else
-static inline void dump_pzl(struct whc *whc, const char *tag)
-{
-}
-#endif
-
 static void update_pzl_pointers(struct whc *whc, int period, u64 addr)
 {
 	switch (period) {
@@ -195,11 +171,26 @@ void pzl_stop(struct whc *whc)
 		      1000, "stop PZL");
 }
 
+/**
+ * pzl_update - request a PZL update and wait for the hardware to be synced
+ * @whc: the WHCI HC
+ * @wusbcmd: WUSBCMD value to start the update.
+ *
+ * If the WUSB HC is inactive (i.e., the PZL is stopped) then the
+ * update must be skipped as the hardware may not respond to update
+ * requests.
+ */
 void pzl_update(struct whc *whc, uint32_t wusbcmd)
 {
-	whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
-	wait_event(whc->periodic_list_wq,
-		   (le_readl(whc->base + WUSBCMD) & WUSBCMD_PERIODIC_UPDATED) == 0);
+	struct wusbhc *wusbhc = &whc->wusbhc;
+
+	mutex_lock(&wusbhc->mutex);
+	if (wusbhc->active) {
+		whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
+		wait_event(whc->periodic_list_wq,
+			   (le_readl(whc->base + WUSBCMD) & WUSBCMD_PERIODIC_UPDATED) == 0);
+	}
+	mutex_unlock(&wusbhc->mutex);
 }
 
 static void update_pzl_hw_view(struct whc *whc)
@@ -235,8 +226,6 @@ void scan_periodic_work(struct work_struct *work)
 
 	spin_lock_irq(&whc->lock);
 
-	dump_pzl(whc, "before processing");
-
 	for (period = 4; period >= 0; period--) {
 		list_for_each_entry_safe(qset, t, &whc->periodic_list[period], list_node) {
 			if (!qset->in_hw_list)
@@ -248,8 +237,6 @@ void scan_periodic_work(struct work_struct *work)
 	if (update & (WHC_UPDATE_ADDED | WHC_UPDATE_REMOVED))
 		update_pzl_hw_view(whc);
 
-	dump_pzl(whc, "after processing");
-
 	spin_unlock_irq(&whc->lock);
 
 	if (update) {