xhci: Fix leaking USB3 shared_hcd at xhci removal

commit f068090426ea8d72c408ebd42953a82a88e2282c upstream.

Ensure that the shared_hcd pointer is valid when calling usb_put_hcd()

The shared_hcd is removed and freed in xhci by first calling
usb_remove_hcd(xhci->shared_hcd), and later
usb_put_hcd(xhci->shared_hcd)

Afer commit fe190ed0d602 ("xhci: Do not halt the host until both HCD have
disconnected their devices.") the shared_hcd was never properly put as
xhci->shared_hcd was set to NULL before usb_put_hcd(xhci->shared_hcd) was
called.

shared_hcd (USB3) is removed before primary hcd (USB2).
While removing the primary hcd we might need to handle xhci interrupts
to cleanly remove last USB2 devices, therefore we need to set
xhci->shared_hcd to NULL before removing the primary hcd to let xhci
interrupt handler know shared_hcd is no longer available.

xhci-plat.c, xhci-histb.c and xhci-mtk first create both their hcd's before
adding them. so to keep the correct reverse removal order use a temporary
shared_hcd variable for them.
For more details see commit 4ac53087d6d4 ("usb: xhci: plat: Create both
HCDs before adding them")

Fixes: fe190ed0d602 ("xhci: Do not halt the host until both HCD have disconnected their devices.")
Cc: Joel Stanley <joel@jms.id.au>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Jianguo Sun <sunjianguo1@huawei.com>
Cc: <stable@vger.kernel.org>
Reported-by: Jack Pham <jackp@codeaurora.org>
Tested-by: Jack Pham <jackp@codeaurora.org>
Tested-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 510d28a..35aecbc 100644 (file)
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -724,14 +724,16 @@ static int xhci_mtk_remove(struct platform_device *dev)
        struct xhci_hcd_mtk *mtk = platform_get_drvdata(dev);
        struct usb_hcd  *hcd = mtk->hcd;
        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+       struct usb_hcd  *shared_hcd = xhci->shared_hcd;
 
-       usb_remove_hcd(xhci->shared_hcd);
+       usb_remove_hcd(shared_hcd);
+       xhci->shared_hcd = NULL;
        xhci_mtk_phy_power_off(mtk);
        xhci_mtk_phy_exit(mtk);
        device_init_wakeup(&dev->dev, false);
 
        usb_remove_hcd(hcd);
-       usb_put_hcd(xhci->shared_hcd);
+       usb_put_hcd(shared_hcd);
        usb_put_hcd(hcd);
        xhci_mtk_sch_exit(mtk);
        xhci_mtk_clks_disable(mtk);

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 0fbc549..1de006a 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -370,6 +370,7 @@ static void xhci_pci_remove(struct pci_dev *dev)
        if (xhci->shared_hcd) {
                usb_remove_hcd(xhci->shared_hcd);
                usb_put_hcd(xhci->shared_hcd);
+               xhci->shared_hcd = NULL;
        }
 
        /* Workaround for spurious wakeups at shutdown with HSW */

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 830dd0d..108a212 100644 (file)
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -332,14 +332,16 @@ static int xhci_plat_remove(struct platform_device *dev)
        struct usb_hcd  *hcd = platform_get_drvdata(dev);
        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
        struct clk *clk = xhci->clk;
+       struct usb_hcd *shared_hcd = xhci->shared_hcd;
 
        xhci->xhc_state |= XHCI_STATE_REMOVING;
 
-       usb_remove_hcd(xhci->shared_hcd);
+       usb_remove_hcd(shared_hcd);
+       xhci->shared_hcd = NULL;
        usb_phy_shutdown(hcd->usb_phy);
 
        usb_remove_hcd(hcd);
-       usb_put_hcd(xhci->shared_hcd);
+       usb_put_hcd(shared_hcd);
 
        if (!IS_ERR(clk))
                clk_disable_unprepare(clk);

diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index 32ddafe..28df32d 100644 (file)
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -1178,6 +1178,7 @@ static int tegra_xusb_remove(struct platform_device *pdev)
 
        usb_remove_hcd(xhci->shared_hcd);
        usb_put_hcd(xhci->shared_hcd);
+       xhci->shared_hcd = NULL;
        usb_remove_hcd(tegra->hcd);
        usb_put_hcd(tegra->hcd);
 

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 930eecd..c78de07 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -669,8 +669,6 @@ static void xhci_stop(struct usb_hcd *hcd)
 
        /* Only halt host and free memory after both hcds are removed */
        if (!usb_hcd_is_primary_hcd(hcd)) {
-               /* usb core will free this hcd shortly, unset pointer */
-               xhci->shared_hcd = NULL;
                mutex_unlock(&xhci->mutex);
                return;
        }