diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/file_storage.c | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c index ea09aaa3cab..f6f0b2aa114 100644 --- a/drivers/usb/gadget/file_storage.c +++ b/drivers/usb/gadget/file_storage.c @@ -224,6 +224,7 @@ #include <linux/fs.h> #include <linux/init.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/kthread.h> #include <linux/limits.h> #include <linux/list.h> @@ -631,6 +632,9 @@ struct fsg_dev { /* filesem protects: backing files in use */ struct rw_semaphore filesem; + /* reference counting: wait until all LUNs are released */ + struct kref ref; + struct usb_ep *ep0; // Handy copy of gadget->ep0 struct usb_request *ep0req; // For control responses volatile unsigned int ep0_req_tag; @@ -694,7 +698,6 @@ struct fsg_dev { unsigned int nluns; struct lun *luns; struct lun *curlun; - struct completion lun_released; }; typedef void (*fsg_routine_t)(struct fsg_dev *); @@ -3642,11 +3645,19 @@ static DEVICE_ATTR(file, 0444, show_file, NULL); /*-------------------------------------------------------------------------*/ +static void fsg_release(struct kref *ref) +{ + struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref); + + kfree(fsg->luns); + kfree(fsg); +} + static void lun_release(struct device *dev) { struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev); - complete(&fsg->lun_released); + kref_put(&fsg->ref, fsg_release); } static void fsg_unbind(struct usb_gadget *gadget) @@ -3660,14 +3671,12 @@ static void fsg_unbind(struct usb_gadget *gadget) clear_bit(REGISTERED, &fsg->atomic_bitflags); /* Unregister the sysfs attribute files and the LUNs */ - init_completion(&fsg->lun_released); for (i = 0; i < fsg->nluns; ++i) { curlun = &fsg->luns[i]; if (curlun->registered) { device_remove_file(&curlun->dev, &dev_attr_ro); device_remove_file(&curlun->dev, &dev_attr_file); device_unregister(&curlun->dev); - wait_for_completion(&fsg->lun_released); curlun->registered = 0; } } @@ -3846,6 +3855,7 @@ static int __init fsg_bind(struct usb_gadget *gadget) curlun->dev.release = lun_release; device_create_file(&curlun->dev, &dev_attr_ro); device_create_file(&curlun->dev, &dev_attr_file); + kref_get(&fsg->ref); } if (file[i] && *file[i]) { @@ -4061,6 +4071,7 @@ static int __init fsg_alloc(void) return -ENOMEM; spin_lock_init(&fsg->lock); init_rwsem(&fsg->filesem); + kref_init(&fsg->ref); init_waitqueue_head(&fsg->thread_wqh); init_completion(&fsg->thread_notifier); @@ -4069,13 +4080,6 @@ static int __init fsg_alloc(void) } -static void fsg_free(struct fsg_dev *fsg) -{ - kfree(fsg->luns); - kfree(fsg); -} - - static int __init fsg_init(void) { int rc; @@ -4085,7 +4089,7 @@ static int __init fsg_init(void) return rc; fsg = the_fsg; if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0) - fsg_free(fsg); + kref_put(&fsg->ref, fsg_release); return rc; } module_init(fsg_init); @@ -4103,6 +4107,6 @@ static void __exit fsg_cleanup(void) wait_for_completion(&fsg->thread_notifier); close_all_backing_files(fsg); - fsg_free(fsg); + kref_put(&fsg->ref, fsg_release); } module_exit(fsg_cleanup); |