USB: force handover port to companion when hub_port_connect_change fails
This patch hands over the port to the companion when the
hub_port_connect_change fails.
Signed-off-by: Balaji Rao <balajirrao@gmail.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 1ad7a65..a165e0a 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -314,41 +314,21 @@
}
/*
- * Dedicate or undedicate a port to the companion controller.
- * Syntax is "[-]portnum", where a leading '-' sign means
- * return control of the port to the EHCI controller.
+ * Sets the owner of a port
*/
-static ssize_t store_companion(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
+static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
{
- struct ehci_hcd *ehci;
- int portnum, new_owner, try;
u32 __iomem *status_reg;
u32 port_status;
+ int try;
- ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
- new_owner = PORT_OWNER; /* Owned by companion */
- if (sscanf(buf, "%d", &portnum) != 1)
- return -EINVAL;
- if (portnum < 0) {
- portnum = - portnum;
- new_owner = 0; /* Owned by EHCI */
- }
- if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
- return -ENOENT;
- status_reg = &ehci->regs->port_status[--portnum];
- if (new_owner)
- set_bit(portnum, &ehci->companion_ports);
- else
- clear_bit(portnum, &ehci->companion_ports);
+ status_reg = &ehci->regs->port_status[portnum];
/*
* The controller won't set the OWNER bit if the port is
* enabled, so this loop will sometimes require at least two
* iterations: one to disable the port and one to set OWNER.
*/
-
for (try = 4; try > 0; --try) {
spin_lock_irq(&ehci->lock);
port_status = ehci_readl(ehci, status_reg);
@@ -365,6 +345,36 @@
if (try > 1)
msleep(5);
}
+}
+
+/*
+ * Dedicate or undedicate a port to the companion controller.
+ * Syntax is "[-]portnum", where a leading '-' sign means
+ * return control of the port to the EHCI controller.
+ */
+static ssize_t store_companion(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ehci_hcd *ehci;
+ int portnum, new_owner;
+
+ ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+ new_owner = PORT_OWNER; /* Owned by companion */
+ if (sscanf(buf, "%d", &portnum) != 1)
+ return -EINVAL;
+ if (portnum < 0) {
+ portnum = - portnum;
+ new_owner = 0; /* Owned by EHCI */
+ }
+ if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
+ return -ENOENT;
+ portnum--;
+ if (new_owner)
+ set_bit(portnum, &ehci->companion_ports);
+ else
+ clear_bit(portnum, &ehci->companion_ports);
+ set_owner(ehci, portnum, new_owner);
return count;
}
static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
@@ -867,3 +877,13 @@
spin_unlock_irqrestore (&ehci->lock, flags);
return retval;
}
+
+static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+ if (ehci_is_TDI(ehci))
+ return;
+ set_owner(ehci, --portnum, PORT_OWNER);
+}
+