On 10-03-20, 08:52, Dave Jiang wrote:
> The refcount check for dedicuated workqueue (dwq) is off by one and allows
s/dedicuated/dedicated
> more than 1 user to open the char device. Fix check so only a single user
> can open the device.
>
> Fixes: 42d279f9137a ("dmaengine: idxd: add char driver to expose submission portal to userland")
> Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
> ---
> drivers/dma/idxd/cdev.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
> index e4379ba04a9a..f5e43f65a5ed 100644
> --- a/drivers/dma/idxd/cdev.c
> +++ b/drivers/dma/idxd/cdev.c
> @@ -84,9 +84,9 @@ static int idxd_cdev_open(struct inode *inode, struct file *filp)
> dev = &idxd->pdev->dev;
> idxd_cdev = &wq->idxd_cdev;
>
> - dev_dbg(dev, "%s called\n", __func__);
> + dev_dbg(dev, "%s called: %d\n", __func__, idxd_wq_refcount(wq));
>
> - if (idxd_wq_refcount(wq) > 1 && wq_dedicated(wq))
> + if (idxd_wq_refcount(wq) > 0 && wq_dedicated(wq))
> return -EBUSY;
>
> ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
--
~Vinod
