USB: EHCI: Refactor "if (handshake()) state = HC_STATE_HALT"

Refactor the EHCI "if (handshake()) state = HC_STATE_HALT" idiom,
which appears 4 times, by replacing it with calls to a new function
called handshake_on_error_set_halt().  Saves a few bytes too.
Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/ehci-hcd.c

@@ -145,6 +145,16 @@ static int handshake (struct ehci_hcd *ehci, void __iomem *ptr,
 	return -ETIMEDOUT;
 }
 
+static int handshake_on_error_set_halt(struct ehci_hcd *ehci, void __iomem *ptr,
+				       u32 mask, u32 done, int usec)
+{
+	int error = handshake(ehci, ptr, mask, done, usec);
+	if (error)
+		ehci_to_hcd(ehci)->state = HC_STATE_HALT;
+
+	return error;
+}
+
 /* force HC to halt state from unknown (EHCI spec section 2.3) */
 static int ehci_halt (struct ehci_hcd *ehci)
 {
@@ -217,11 +227,9 @@ static void ehci_quiesce (struct ehci_hcd *ehci)
 	/* wait for any schedule enables/disables to take effect */
 	temp = ehci_readl(ehci, &ehci->regs->command) << 10;
 	temp &= STS_ASS | STS_PSS;
-	if (handshake (ehci, &ehci->regs->status, STS_ASS | STS_PSS,
-				temp, 16 * 125) != 0) {
-		ehci_to_hcd(ehci)->state = HC_STATE_HALT;
+	if (handshake_on_error_set_halt(ehci, &ehci->regs->status,
+					STS_ASS | STS_PSS, temp, 16 * 125))
 		return;
-	}
 
 	/* then disable anything that's still active */
 	temp = ehci_readl(ehci, &ehci->regs->command);
@@ -229,11 +237,8 @@ static void ehci_quiesce (struct ehci_hcd *ehci)
 	ehci_writel(ehci, temp, &ehci->regs->command);
 
 	/* hardware can take 16 microframes to turn off ... */
-	if (handshake (ehci, &ehci->regs->status, STS_ASS | STS_PSS,
-				0, 16 * 125) != 0) {
-		ehci_to_hcd(ehci)->state = HC_STATE_HALT;
-		return;
-	}
+	handshake_on_error_set_halt(ehci, &ehci->regs->status,
+				    STS_ASS | STS_PSS, 0, 16 * 125);
 }
 
 /*-------------------------------------------------------------------------*/

drivers/usb/host/ehci-sched.c

@@ -440,11 +440,10 @@ static int enable_periodic (struct ehci_hcd *ehci)
 	/* did clearing PSE did take effect yet?
 	 * takes effect only at frame boundaries...
 	 */
-	status = handshake(ehci, &ehci->regs->status, STS_PSS, 0, 9 * 125);
-	if (status != 0) {
-		ehci_to_hcd(ehci)->state = HC_STATE_HALT;
+	status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
+					     STS_PSS, 0, 9 * 125);
+	if (status)
 		return status;
-	}
 
 	cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE;
 	ehci_writel(ehci, cmd, &ehci->regs->command);
@@ -465,11 +464,10 @@ static int disable_periodic (struct ehci_hcd *ehci)
 	/* did setting PSE not take effect yet?
 	 * takes effect only at frame boundaries...
 	 */
-	status = handshake(ehci, &ehci->regs->status, STS_PSS, STS_PSS, 9 * 125);
-	if (status != 0) {
-		ehci_to_hcd(ehci)->state = HC_STATE_HALT;
+	status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
+					     STS_PSS, STS_PSS, 9 * 125);
+	if (status)
 		return status;
-	}
 
 	cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE;
 	ehci_writel(ehci, cmd, &ehci->regs->command);