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| author | Felipe Balbi <balbi@ti.com> | 2013-07-17 11:09:49 +0300 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2013-07-29 13:57:02 +0300 |
| commit | 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 (patch) | |
| tree | 92a45aca9238a714ca0472436e3563e6033de1f6 /drivers/usb/gadget/udc-core.c | |
| parent | c75f52fb26aa9c10b3f5ee157bc0c6c8e8e9bb1a (diff) | |
| download | linux-stable-5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15.tar.gz linux-stable-5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15.tar.bz2 linux-stable-5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15.zip | |
usb: gadget: udc-core: move sysfs_notify() to a workqueue
usb_gadget_set_state() will call sysfs_notify()
which might sleep. Some users might want to call
usb_gadget_set_state() from the very IRQ handler
which actually changes the gadget state.
Instead of having every UDC driver add their own
workqueue for such a simple notification, we're
adding it generically to our struct usb_gadget,
so the details are hidden from all UDC drivers.
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/gadget/udc-core.c')
| -rw-r--r-- | drivers/usb/gadget/udc-core.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c index c28ac9872030..3122ab942f75 100644 --- a/drivers/usb/gadget/udc-core.c +++ b/drivers/usb/gadget/udc-core.c @@ -23,6 +23,7 @@ #include <linux/list.h> #include <linux/err.h> #include <linux/dma-mapping.h> +#include <linux/workqueue.h> #include <linux/usb/ch9.h> #include <linux/usb/gadget.h> @@ -105,11 +106,18 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request); /* ------------------------------------------------------------------------- */ +static void usb_gadget_state_work(struct work_struct *work) +{ + struct usb_gadget *gadget = work_to_gadget(work); + + sysfs_notify(&gadget->dev.kobj, NULL, "status"); +} + void usb_gadget_set_state(struct usb_gadget *gadget, enum usb_device_state state) { gadget->state = state; - sysfs_notify(&gadget->dev.kobj, NULL, "status"); + schedule_work(&gadget->work); } EXPORT_SYMBOL_GPL(usb_gadget_set_state); @@ -196,6 +204,7 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, goto err1; dev_set_name(&gadget->dev, "gadget"); + INIT_WORK(&gadget->work, usb_gadget_state_work); gadget->dev.parent = parent; #ifdef CONFIG_HAS_DMA @@ -315,6 +324,7 @@ found: usb_gadget_remove_driver(udc); kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE); + flush_work(&gadget->work); device_unregister(&udc->dev); device_unregister(&gadget->dev); } |