4 files changed, 30 insertions, 14 deletions

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index fa66e6e58792..6abb7294e919 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -139,30 +139,42 @@ MODULE_PARM_DESC(usbfs_memory_mb,
 /* Hard limit, necessary to avoid arithmetic overflow */
 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 
-static atomic64_t usbfs_memory_usage;	/* Total memory currently allocated */
+static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
+static u64 usbfs_memory_usage;	/* Total memory currently allocated */
 
 /* Check whether it's okay to allocate more memory for a transfer */
 static int usbfs_increase_memory_usage(u64 amount)
 {
-	u64 lim;
+	u64 lim, total_mem;
+	unsigned long flags;
+	int ret;
 
 	lim = READ_ONCE(usbfs_memory_mb);
 	lim <<= 20;
 
-	atomic64_add(amount, &usbfs_memory_usage);
-
-	if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
-		atomic64_sub(amount, &usbfs_memory_usage);
-		return -ENOMEM;
-	}
+	ret = 0;
+	spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
+	total_mem = usbfs_memory_usage + amount;
+	if (lim > 0 && total_mem > lim)
+		ret = -ENOMEM;
+	else
+		usbfs_memory_usage = total_mem;
+	spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 
-	return 0;
+	return ret;
 }
 
 /* Memory for a transfer is being deallocated */
 static void usbfs_decrease_memory_usage(u64 amount)
 {
-	atomic64_sub(amount, &usbfs_memory_usage);
+	unsigned long flags;
+
+	spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
+	if (amount > usbfs_memory_usage)
+		usbfs_memory_usage = 0;
+	else
+		usbfs_memory_usage -= amount;
+	spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 }
 
 static int connected(struct usb_dev_state *ps)
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index d630cccd2e6e..784466117c92 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -248,7 +248,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id,
 					hcd->rsrc_len, driver->description))
 				break;
 		}
-		if (region == PCI_ROM_RESOURCE) {
+		if (region == PCI_STD_NUM_BARS) {
 			dev_dbg(&dev->dev, "no i/o regions available\n");
 			retval = -EBUSY;
 			goto put_hcd;
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 47a1c8bddf86..83b5aff25dd6 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2983,8 +2983,12 @@ static int hub_port_reset(struct usb_hub *hub, int port1,
 						status);
 		}
 
-		/* Check for disconnect or reset */
-		if (status == 0 || status == -ENOTCONN || status == -ENODEV) {
+		/*
+		 * Check for disconnect or reset, and bail out after several
+		 * reset attempts to avoid warm reset loop.
+		 */
+		if (status == 0 || status == -ENOTCONN || status == -ENODEV ||
+		    (status == -EBUSY && i == PORT_RESET_TRIES - 1)) {
 			usb_clear_port_feature(hub->hdev, port1,
 					USB_PORT_FEAT_C_RESET);
 
diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c
index 50b2fc7fcc0e..bb1da35eb891 100644
--- a/drivers/usb/core/usb-acpi.c
+++ b/drivers/usb/core/usb-acpi.c
@@ -166,7 +166,7 @@ usb_acpi_get_companion_for_port(struct usb_port *port_dev)
 		if (!parent_handle)
 			return NULL;
 
-		acpi_bus_get_device(parent_handle, &adev);
+		adev = acpi_fetch_acpi_dev(parent_handle);
 		port1 = port_dev->portnum;
 	}