USB: EHCI: remove usages of hcd->state

This patch (as1483) improves the ehci-hcd driver family by getting rid
of the reliance on the hcd->state variable.  It has no clear owner and
it isn't protected by the usual HCD locks.  In its place, the patch
adds a new, private ehci->rh_state field to record the state of the
root hub.

Along the way, the patch removes a couple of lines containing
redundant assignments to the state variable.  Also, the QUIESCING
state simply gets changed to the RUNNING state, because the driver
doesn't make any distinction between them.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 10 insertions, 10 deletions

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 2af3e2a..8696489 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -238,7 +238,7 @@ static int handshake_on_error_set_halt(struct ehci_hcd *ehci, void __iomem *ptr,
 	error = handshake(ehci, ptr, mask, done, usec);
 	if (error) {
 		ehci_halt(ehci);
-		ehci_to_hcd(ehci)->state = HC_STATE_HALT;
+		ehci->rh_state = EHCI_RH_HALTED;
 		ehci_err(ehci, "force halt; handshake %p %08x %08x -> %d\n",
 			ptr, mask, done, error);
 	}
@@ -278,7 +278,7 @@ static int ehci_reset (struct ehci_hcd *ehci)
 	command |= CMD_RESET;
 	dbg_cmd (ehci, "reset", command);
 	ehci_writel(ehci, command, &ehci->regs->command);
-	ehci_to_hcd(ehci)->state = HC_STATE_HALT;
+	ehci->rh_state = EHCI_RH_HALTED;
 	ehci->next_statechange = jiffies;
 	retval = handshake (ehci, &ehci->regs->command,
 			    CMD_RESET, 0, 250 * 1000);
@@ -307,7 +307,7 @@ static void ehci_quiesce (struct ehci_hcd *ehci)
 	u32	temp;
 
 #ifdef DEBUG
-	if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
+	if (ehci->rh_state != EHCI_RH_RUNNING)
 		BUG ();
 #endif
 
@@ -356,7 +356,7 @@ static void ehci_iaa_watchdog(unsigned long param)
 	 */
 	if (ehci->reclaim
 			&& !timer_pending(&ehci->iaa_watchdog)
-			&& HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
+			&& ehci->rh_state == EHCI_RH_RUNNING) {
 		u32 cmd, status;
 
 		/* If we get here, IAA is *REALLY* late.  It's barely
@@ -496,7 +496,7 @@ static void ehci_work (struct ehci_hcd *ehci)
 	 * misplace IRQs, and should let us run completely without IRQs.
 	 * such lossage has been observed on both VT6202 and VT8235.
 	 */
-	if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
+	if (ehci->rh_state == EHCI_RH_RUNNING &&
 			(ehci->async->qh_next.ptr != NULL ||
 			 ehci->periodic_sched != 0))
 		timer_action (ehci, TIMER_IO_WATCHDOG);
@@ -516,7 +516,7 @@ static void ehci_stop (struct usb_hcd *hcd)
 	del_timer_sync(&ehci->iaa_watchdog);
 
 	spin_lock_irq(&ehci->lock);
-	if (HC_IS_RUNNING (hcd->state))
+	if (ehci->rh_state == EHCI_RH_RUNNING)
 		ehci_quiesce (ehci);
 
 	ehci_silence_controller(ehci);
@@ -741,7 +741,7 @@ static int ehci_run (struct usb_hcd *hcd)
 	 * be started before the port switching actions could complete.
 	 */
 	down_write(&ehci_cf_port_reset_rwsem);
-	hcd->state = HC_STATE_RUNNING;
+	ehci->rh_state = EHCI_RH_RUNNING;
 	ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 	ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */
 	msleep(5);
@@ -788,7 +788,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 
 	/* Shared IRQ? */
 	masked_status = status & INTR_MASK;
-	if (!masked_status || unlikely(hcd->state == HC_STATE_HALT)) {
+	if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
 		spin_unlock(&ehci->lock);
 		return IRQ_NONE;
 	}
@@ -952,7 +952,7 @@ static int ehci_urb_enqueue (
 static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 {
 	/* failfast */
-	if (!HC_IS_RUNNING(ehci_to_hcd(ehci)->state) && ehci->reclaim)
+	if (ehci->rh_state != EHCI_RH_RUNNING && ehci->reclaim)
 		end_unlink_async(ehci);
 
 	/* If the QH isn't linked then there's nothing we can do
@@ -1079,7 +1079,7 @@ rescan:
 		goto idle_timeout;
 	}
 
-	if (!HC_IS_RUNNING (hcd->state))
+	if (ehci->rh_state != EHCI_RH_RUNNING)
 		qh->qh_state = QH_STATE_IDLE;
 	switch (qh->qh_state) {
 	case QH_STATE_LINKED: