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usb: gadget: function: f_fs: Move epfile waitqueue to ffs_data. 

There were individual waitqueues for each epfile but eps_enable
would iterate through all of them, resulting in essentially the
same wakeup time.

The waitqueue represents the function being enabled, so a central
waitqueue in ffs_data makes more sense and is less redundant.

Also use wake_up_interruptible to reflect use of
wait_event_interruptible.

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Jerry Zhang <zhangjerry@google.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Jerry Zhang 2017-04-18 16:11:48 -07:00 committed by Felipe Balbi
parent 222155de45
commit e16828cf94
2 changed files with 13 additions and 9 deletions
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19
drivers/usb/gadget/function/f_fs.c
View File

@ -127,7 +127,6 @@ struct ffs_ep {
struct ffs_epfile {
/* Protects ep->ep and ep->req. */
struct mutex mutex;
wait_queue_head_t wait;
struct ffs_data *ffs;
struct ffs_ep *ep; /* P: ffs->eps_lock */
@ -889,7 +888,8 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep));
ret = wait_event_interruptible(
epfile->ffs->wait, (ep = epfile->ep));
if (ret)
return -EINTR;
}
@ -1203,7 +1203,8 @@ static long ffs_epfile_ioctl(struct file *file, unsigned code,
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep));
ret = wait_event_interruptible(
epfile->ffs->wait, (ep = epfile->ep));
if (ret)
return -EINTR;
}
@ -1608,7 +1609,8 @@ static void ffs_data_put(struct ffs_data *ffs)
pr_info("%s(): freeing\n", __func__);
ffs_data_clear(ffs);
BUG_ON(waitqueue_active(&ffs->ev.waitq) ||
waitqueue_active(&ffs->ep0req_completion.wait));
waitqueue_active(&ffs->ep0req_completion.wait) ||
waitqueue_active(&ffs->wait));
kfree(ffs->dev_name);
kfree(ffs);
}
@ -1655,6 +1657,7 @@ static struct ffs_data *ffs_data_new(void)
mutex_init(&ffs->mutex);
spin_lock_init(&ffs->eps_lock);
init_waitqueue_head(&ffs->ev.waitq);
init_waitqueue_head(&ffs->wait);
init_completion(&ffs->ep0req_completion);
/* XXX REVISIT need to update it in some places, or do we? */
@ -1776,7 +1779,6 @@ static int ffs_epfiles_create(struct ffs_data *ffs)
for (i = 1; i <= count; ++i, ++epfile) {
epfile->ffs = ffs;
mutex_init(&epfile->mutex);
init_waitqueue_head(&epfile->wait);
if (ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR)
sprintf(epfile->name, "ep%02x", ffs->eps_addrmap[i]);
else
@ -1801,8 +1803,7 @@ static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count)
ENTER();
for (; count; --count, ++epfile) {
BUG_ON(mutex_is_locked(&epfile->mutex) ||
waitqueue_active(&epfile->wait));
BUG_ON(mutex_is_locked(&epfile->mutex));
if (epfile->dentry) {
d_delete(epfile->dentry);
dput(epfile->dentry);
@ -1889,11 +1890,11 @@ static int ffs_func_eps_enable(struct ffs_function *func)
break;
}
wake_up(&epfile->wait);
++ep;
++epfile;
}
wake_up_interruptible(&ffs->wait);
spin_unlock_irqrestore(&func->ffs->eps_lock, flags);
return ret;

3
drivers/usb/gadget/function/u_fs.h
View File

@ -216,6 +216,9 @@ struct ffs_data {
#define FFS_FL_CALL_CLOSED_CALLBACK 0
#define FFS_FL_BOUND 1
/* For waking up blocked threads when function is enabled. */
wait_queue_head_t wait;
/* Active function */
struct ffs_function *func;