As mentioned at drivers/base/core.c:
/*
* NOTE: _Never_ directly free @dev after calling this function, even
* if it returned an error! Always use put_device() to give up the
* reference initialized in this function instead.
*/
so we don't free vdev until vdev->vdev.dev.release be called.
Signed-off-by: weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>
---
drivers/misc/mic/vop/vop_main.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/misc/mic/vop/vop_main.c b/drivers/misc/mic/vop/vop_main.c
index a341938..53eaa9d 100644
--- a/drivers/misc/mic/vop/vop_main.c
+++ b/drivers/misc/mic/vop/vop_main.c
@@ -452,10 +452,12 @@ static irqreturn_t vop_virtio_intr_handler(int irq, void *data)
static void vop_virtio_release_dev(struct device *_d)
{
- /*
- * No need for a release method similar to virtio PCI.
- * Provide an empty one to avoid getting a warning from core.
- */
+ struct virtio_device *vdev =
+ container_of(_d, struct virtio_device, dev);
+ struct _vop_vdev *vop_vdev =
+ container_of(vdev, struct _vop_vdev, vdev);
+
+ kfree(vop_vdev);
}
/*
@@ -512,7 +514,10 @@ static int _vop_add_device(struct mic_device_desc __iomem *d,
free_irq:
vpdev->hw_ops->free_irq(vpdev, vdev->virtio_cookie, vdev);
kfree:
- kfree(vdev);
+ if (VIRTIO_CONFIG_S_ACKNOWLEDGE & virtio_get_status(&vdev->vdev))
+ put_device(&vdev->vdev.dev);
+ else
+ kfree(vdev);
return ret;
}
@@ -568,7 +573,7 @@ static int _vop_remove_device(struct mic_device_desc __iomem *d,
iowrite8(-1, &dc->h2c_vdev_db);
if (status & VIRTIO_CONFIG_S_DRIVER_OK)
wait_for_completion(&vdev->reset_done);
- kfree(vdev);
+ put_device(&vdev->vdev.dev);
iowrite8(1, &dc->guest_ack);
dev_dbg(&vpdev->dev, "%s %d guest_ack %d\n",
__func__, __LINE__, ioread8(&dc->guest_ack));
--
2.9.4
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