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usbip: usbip_host: run rebind from exit when module is removed 

After removing usbip_host module, devices it releases are left without
a driver. For example, when a keyboard or a mass storage device are
bound to usbip_host when it is removed, these devices are no longer
bound to any driver.

Fix it to run device_attach() from the module exit routine to restore
the devices to their original drivers. This includes cleanup changes
and moving device_attach() code to a common routine to be called from
rebind_store() and usbip_host_exit().

Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuah Khan (Samsung OSG) 2018-04-30 16:17:20 -06:00 committed by Greg Kroah-Hartman
parent ae70c6dc3f
commit dcadfaf212
2 changed files with 52 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/usbip/stub_dev.c
View File

@ -448,12 +448,8 @@ static void stub_disconnect(struct usb_device *udev)
busid_priv->sdev = NULL;
stub_device_free(sdev);
if (busid_priv->status == STUB_BUSID_ALLOC) {
if (busid_priv->status == STUB_BUSID_ALLOC)
busid_priv->status = STUB_BUSID_ADDED;
} else {
busid_priv->status = STUB_BUSID_OTHER;
del_match_busid((char *)udev_busid);
}
}
#ifdef CONFIG_PM

60
drivers/usb/usbip/stub_main.c
View File

@ -14,6 +14,7 @@
#define DRIVER_DESC "USB/IP Host Driver"
struct kmem_cache *stub_priv_cache;
/*
* busid_tables defines matching busids that usbip can grab. A user can change
* dynamically what device is locally used and what device is exported to a
@ -169,6 +170,51 @@ static ssize_t match_busid_store(struct device_driver *dev, const char *buf,
}
static DRIVER_ATTR_RW(match_busid);
static int do_rebind(char *busid, struct bus_id_priv *busid_priv)
{
int ret;
/* device_attach() callers should hold parent lock for USB */
if (busid_priv->udev->dev.parent)
device_lock(busid_priv->udev->dev.parent);
ret = device_attach(&busid_priv->udev->dev);
if (busid_priv->udev->dev.parent)
device_unlock(busid_priv->udev->dev.parent);
if (ret < 0) {
dev_err(&busid_priv->udev->dev, "rebind failed\n");
return ret;
}
return 0;
}
static void stub_device_rebind(void)
{
#if IS_MODULE(CONFIG_USBIP_HOST)
struct bus_id_priv *busid_priv;
int i;
/* update status to STUB_BUSID_OTHER so probe ignores the device */
spin_lock(&busid_table_lock);
for (i = 0; i < MAX_BUSID; i++) {
if (busid_table[i].name[0] &&
busid_table[i].shutdown_busid) {
busid_priv = &(busid_table[i]);
busid_priv->status = STUB_BUSID_OTHER;
}
}
spin_unlock(&busid_table_lock);
/* now run rebind */
for (i = 0; i < MAX_BUSID; i++) {
if (busid_table[i].name[0] &&
busid_table[i].shutdown_busid) {
busid_priv = &(busid_table[i]);
do_rebind(busid_table[i].name, busid_priv);
}
}
#endif
}
static ssize_t rebind_store(struct device_driver *dev, const char *buf,
size_t count)
{
@ -189,16 +235,9 @@ static ssize_t rebind_store(struct device_driver *dev, const char *buf,
/* mark the device for deletion so probe ignores it during rescan */
bid->status = STUB_BUSID_OTHER;
/* device_attach() callers should hold parent lock for USB */
if (bid->udev->dev.parent)
device_lock(bid->udev->dev.parent);
ret = device_attach(&bid->udev->dev);
if (bid->udev->dev.parent)
device_unlock(bid->udev->dev.parent);
if (ret < 0) {
dev_err(&bid->udev->dev, "rebind failed\n");
ret = do_rebind((char *) buf, bid);
if (ret < 0)
return ret;
}
/* delete device from busid_table */
del_match_busid((char *) buf);
@ -323,6 +362,9 @@ static void __exit usbip_host_exit(void)
*/
usb_deregister_device_driver(&stub_driver);
/* initiate scan to attach devices */
stub_device_rebind();
kmem_cache_destroy(stub_priv_cache);
}