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authorDeng-Cheng Zhu <dengcheng.zhu@imgtec.com>2013-10-05 23:08:17 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-07 00:07:17 -0700
commit5a3e2055c56c7c32b51d47bde78c7f7508ffea98 (patch)
tree5bf3a633e6d37f2aa694277276442b6dc604201e /drivers/usb/host/uhci-hub.c
parentcae9160d9b074a75c5ae4b08a8552155b1607b9b (diff)
USB/host: Bugfix: Return length of copied buffer in uhci_hub_control()
In addition to the error statuses -ETIMEDOUT and -EPIPE, uhci_hub_control() needs to return the length of copied buffer when appropriate, so that the returned status of ->hub_control() in rh_call_control() in the USB core HCD can be properly handled. This patch also removes the OK() macro to make the code more readable. Reviewed-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/uhci-hub.c')
-rw-r--r--drivers/usb/host/uhci-hub.c40
1 files changed, 20 insertions, 20 deletions
diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c
index 9189bc984c98..93e17b12fb33 100644
--- a/drivers/usb/host/uhci-hub.c
+++ b/drivers/usb/host/uhci-hub.c
@@ -75,8 +75,6 @@ static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf)
return !!*buf;
}
-#define OK(x) len = (x); break
-
#define CLR_RH_PORTSTAT(x) \
status = uhci_readw(uhci, port_addr); \
status &= ~(RWC_BITS|WZ_BITS); \
@@ -244,7 +242,7 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
u16 wIndex, char *buf, u16 wLength)
{
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
- int status, lstatus, retval = 0, len = 0;
+ int status, lstatus, retval = 0;
unsigned int port = wIndex - 1;
unsigned long port_addr = USBPORTSC1 + 2 * port;
u16 wPortChange, wPortStatus;
@@ -258,7 +256,8 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
case GetHubStatus:
*(__le32 *)buf = cpu_to_le32(0);
- OK(4); /* hub power */
+ retval = 4; /* hub power */
+ break;
case GetPortStatus:
if (port >= uhci->rh_numports)
goto err;
@@ -311,13 +310,14 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
*(__le16 *)buf = cpu_to_le16(wPortStatus);
*(__le16 *)(buf + 2) = cpu_to_le16(wPortChange);
- OK(4);
+ retval = 4;
+ break;
case SetHubFeature: /* We don't implement these */
case ClearHubFeature:
switch (wValue) {
case C_HUB_OVER_CURRENT:
case C_HUB_LOCAL_POWER:
- OK(0);
+ break;
default:
goto err;
}
@@ -329,7 +329,7 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
switch (wValue) {
case USB_PORT_FEAT_SUSPEND:
SET_RH_PORTSTAT(USBPORTSC_SUSP);
- OK(0);
+ break;
case USB_PORT_FEAT_RESET:
SET_RH_PORTSTAT(USBPORTSC_PR);
@@ -338,10 +338,10 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
/* USB v2.0 7.1.7.5 */
uhci->ports_timeout = jiffies + msecs_to_jiffies(50);
- OK(0);
+ break;
case USB_PORT_FEAT_POWER:
/* UHCI has no power switching */
- OK(0);
+ break;
default:
goto err;
}
@@ -356,10 +356,10 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
/* Disable terminates Resume signalling */
uhci_finish_suspend(uhci, port, port_addr);
- OK(0);
+ break;
case USB_PORT_FEAT_C_ENABLE:
CLR_RH_PORTSTAT(USBPORTSC_PEC);
- OK(0);
+ break;
case USB_PORT_FEAT_SUSPEND:
if (!(uhci_readw(uhci, port_addr) & USBPORTSC_SUSP)) {
@@ -382,32 +382,32 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
uhci->ports_timeout = jiffies +
msecs_to_jiffies(20);
}
- OK(0);
+ break;
case USB_PORT_FEAT_C_SUSPEND:
clear_bit(port, &uhci->port_c_suspend);
- OK(0);
+ break;
case USB_PORT_FEAT_POWER:
/* UHCI has no power switching */
goto err;
case USB_PORT_FEAT_C_CONNECTION:
CLR_RH_PORTSTAT(USBPORTSC_CSC);
- OK(0);
+ break;
case USB_PORT_FEAT_C_OVER_CURRENT:
CLR_RH_PORTSTAT(USBPORTSC_OCC);
- OK(0);
+ break;
case USB_PORT_FEAT_C_RESET:
/* this driver won't report these */
- OK(0);
+ break;
default:
goto err;
}
break;
case GetHubDescriptor:
- len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
- memcpy(buf, root_hub_hub_des, len);
- if (len > 2)
+ retval = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
+ memcpy(buf, root_hub_hub_des, retval);
+ if (retval > 2)
buf[2] = uhci->rh_numports;
- OK(len);
+ break;
default:
err:
retval = -EPIPE;