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authorKent Overstreet <koverstreet@google.com>2013-05-07 16:18:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-07 18:38:29 -0700
commit0460fef2a9215680f7f85415b57731b7e0fdf673 (patch)
treea97456b0a9c6c6f66c4f22eac11d037be4c4d290 /drivers/usb/gadget/inode.c
parent21b40200cfe961b1428a529c63c33b1f1e1b4738 (diff)
aio: use cancellation list lazily
Cancelling kiocbs requires adding them to a per kioctx linked list, which is one of the few things we need to take the kioctx lock for in the fast path. But most kiocbs can't be cancelled - so if we just do this lazily, we can avoid quite a bit of locking overhead. While we're at it, instead of using a flag bit switch to using ki_cancel itself to indicate that a kiocb has been cancelled/completed. This lets us get rid of ki_flags entirely. [akpm@linux-foundation.org: remove buggy BUG()] Signed-off-by: Kent Overstreet <koverstreet@google.com> Cc: Zach Brown <zab@redhat.com> Cc: Felipe Balbi <balbi@ti.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jens Axboe <axboe@kernel.dk> Cc: Asai Thambi S P <asamymuthupa@micron.com> Cc: Selvan Mani <smani@micron.com> Cc: Sam Bradshaw <sbradshaw@micron.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Benjamin LaHaise <bcrl@kvack.org> Reviewed-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/usb/gadget/inode.c')
-rw-r--r--drivers/usb/gadget/inode.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index 994e7433e87a..570c005062ab 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -533,7 +533,6 @@ static int ep_aio_cancel(struct kiocb *iocb, struct io_event *e)
local_irq_disable();
epdata = priv->epdata;
// spin_lock(&epdata->dev->lock);
- kiocbSetCancelled(iocb);
if (likely(epdata && epdata->ep && priv->req))
value = usb_ep_dequeue (epdata->ep, priv->req);
else
@@ -663,7 +662,7 @@ fail:
goto fail;
}
- iocb->ki_cancel = ep_aio_cancel;
+ kiocb_set_cancel_fn(iocb, ep_aio_cancel);
get_ep(epdata);
priv->epdata = epdata;
priv->actual = 0;