This fixes up the deallocation code in the xhci driver, so that
usb_add_hcd()/usb_remove_hcd() can be called repeatedly without
crashing.
In case of DRD mode, the DRD library calls /usb_remove_hcd() while
switching from HOST mode to Device mode, but it doesnot call usb_put_hcd().
We need to preserve the already allocated xhci struct for the subsequent
call of usb_add_hcd() from the DRD library.
A new quirk flag XHCI_DRD_SUPPORT is added to differentiate between
normal usb_remove_hcd and drd specific call.
Signed-off-by: George Cherian <george.cherian@xxxxxx>
---
drivers/usb/host/xhci.c | 22 ++++++++++++++++------
drivers/usb/host/xhci.h | 1 +
2 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 2a5d45b..d4196f8 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -666,7 +666,8 @@ static void xhci_only_stop_hcd(struct usb_hcd *hcd)
* calls this function when allocation fails in usb_add_hcd(), or
* usb_remove_hcd() is called). So we need to unset xHCI's pointer.
*/
- xhci->shared_hcd = NULL;
+ if (!(xhci->quirks & XHCI_DRD_SUPPORT))
+ xhci->shared_hcd = NULL;
spin_unlock_irq(&xhci->lock);
}
@@ -4815,6 +4816,7 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
struct xhci_hcd *xhci;
struct device *dev = hcd->self.controller;
int retval;
+ bool allocated = false;
/* Accept arbitrarily long scatter-gather lists */
hcd->self.sg_tablesize = ~0;
@@ -4826,10 +4828,15 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
hcd->self.no_stop_on_short = 1;
if (usb_hcd_is_primary_hcd(hcd)) {
- xhci = kzalloc(sizeof(struct xhci_hcd), GFP_KERNEL);
- if (!xhci)
- return -ENOMEM;
- *((struct xhci_hcd **) hcd->hcd_priv) = xhci;
+ if (*((struct xhci_hcd **)hcd->hcd_priv) == NULL) {
+ xhci = kzalloc(sizeof(struct xhci_hcd), GFP_KERNEL);
+ if (!xhci)
+ return -ENOMEM;
+ *((struct xhci_hcd **)hcd->hcd_priv) = xhci;
+ allocated = true;
+ } else {
+ xhci = *((struct xhci_hcd **)hcd->hcd_priv);
+ }
xhci->main_hcd = hcd;
/* Mark the first roothub as being USB 2.0.
* The xHCI driver will register the USB 3.0 roothub.
@@ -4902,7 +4909,10 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
xhci_dbg(xhci, "Called HCD init\n");
return 0;
error:
- kfree(xhci);
+ if (allocated) {
+ *((struct xhci_hcd **)hcd->hcd_priv) = NULL;
+ kfree(xhci);
+ }
return retval;
}
EXPORT_SYMBOL_GPL(xhci_gen_setup);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index df76d64..2248058 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1560,6 +1560,7 @@ struct xhci_hcd {
#define XHCI_SPURIOUS_WAKEUP (1 << 18)
/* For controllers with a broken beyond repair streams implementation */
#define XHCI_BROKEN_STREAMS (1 << 19)
+#define XHCI_DRD_SUPPORT (1 << 20)
unsigned int num_active_eps;
unsigned int limit_active_eps;
/* There are two roothubs to keep track of bus suspend info for */
--
1.8.3.1
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