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authorAlex Williamson <alex.williamson@redhat.com>2013-08-28 09:49:55 -0600
committerAlex Williamson <alex.williamson@redhat.com>2013-08-28 09:49:55 -0600
commit20e77457842f4cd253d093f08f0cce1a73afb7db (patch)
tree71a07512440030967a93396992aa5eeaa7d0f991 /drivers/vfio
parent5d042fbdbb2df46c9185942a0c6fe280906ba70c (diff)
downloadlinux-20e77457842f4cd253d093f08f0cce1a73afb7db.tar.gz
vfio-pci: Use fdget() rather than eventfd_fget()
eventfd_fget() tests to see whether the file is an eventfd file, which we then immediately pass to eventfd_ctx_fileget(), which again tests whether the file is an eventfd file. Simplify slightly by using fdget() so that we only test that we're looking at an eventfd once. fget() could also be used, but fdget() makes use of fget_light() for another slight optimization. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/pci/vfio_pci_intrs.c35
1 files changed, 16 insertions, 19 deletions
diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 4bc704e1b7c7..641bc87bdb96 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -130,8 +130,8 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
void (*thread)(struct vfio_pci_device *, void *),
void *data, struct virqfd **pvirqfd, int fd)
{
- struct file *file = NULL;
- struct eventfd_ctx *ctx = NULL;
+ struct fd irqfd;
+ struct eventfd_ctx *ctx;
struct virqfd *virqfd;
int ret = 0;
unsigned int events;
@@ -149,16 +149,16 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
INIT_WORK(&virqfd->shutdown, virqfd_shutdown);
INIT_WORK(&virqfd->inject, virqfd_inject);
- file = eventfd_fget(fd);
- if (IS_ERR(file)) {
- ret = PTR_ERR(file);
- goto fail;
+ irqfd = fdget(fd);
+ if (!irqfd.file) {
+ ret = -EBADF;
+ goto err_fd;
}
- ctx = eventfd_ctx_fileget(file);
+ ctx = eventfd_ctx_fileget(irqfd.file);
if (IS_ERR(ctx)) {
ret = PTR_ERR(ctx);
- goto fail;
+ goto err_ctx;
}
virqfd->eventfd = ctx;
@@ -174,7 +174,7 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
if (*pvirqfd) {
spin_unlock_irq(&vdev->irqlock);
ret = -EBUSY;
- goto fail;
+ goto err_busy;
}
*pvirqfd = virqfd;
@@ -187,7 +187,7 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
init_waitqueue_func_entry(&virqfd->wait, virqfd_wakeup);
init_poll_funcptr(&virqfd->pt, virqfd_ptable_queue_proc);
- events = file->f_op->poll(file, &virqfd->pt);
+ events = irqfd.file->f_op->poll(irqfd.file, &virqfd->pt);
/*
* Check if there was an event already pending on the eventfd
@@ -202,17 +202,14 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
* Do not drop the file until the irqfd is fully initialized,
* otherwise we might race against the POLLHUP.
*/
- fput(file);
+ fdput(irqfd);
return 0;
-
-fail:
- if (ctx && !IS_ERR(ctx))
- eventfd_ctx_put(ctx);
-
- if (file && !IS_ERR(file))
- fput(file);
-
+err_busy:
+ eventfd_ctx_put(ctx);
+err_ctx:
+ fdput(irqfd);
+err_fd:
kfree(virqfd);
return ret;