Friendly ping
> -----Original Message-----
> From: wangyunjian
> Sent: Tuesday, May 19, 2020 11:42 AM
> To: dev@dpdk.org
> Cc: anatoly.bura...@intel.com; hemant.agra...@nxp.com;
> sachin.sax...@nxp.com; Lilijun (Jerry) <jerry.lili...@huawei.com>; xudingke
> <xudin...@huawei.com>; wangyunjian <wangyunj...@huawei.com>;
> sta...@dpdk.org
> Subject: [dpdk-dev] [PATCH 2/2] bus/fslmc: fix check for vfio_group_fd
>
> From: Yunjian Wang <wangyunj...@huawei.com>
>
> The issue is that a file descriptor at 0 is a valid one. Currently the file
> not found,
> the return value will be set to 0. As a result, it is impossible to
> distinguish
> between a correct descriptor and a failed return value. Fix it to return
> -ENOENT
> instead of 0.
>
> Fixes: a69f79300262 ("bus/fslmc: support multi VFIO group")
> Cc: sta...@dpdk.org
>
> Signed-off-by: Yunjian Wang <wangyunj...@huawei.com>
> ---
> drivers/bus/fslmc/fslmc_vfio.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/bus/fslmc/fslmc_vfio.c b/drivers/bus/fslmc/fslmc_vfio.c
> index
> 970969d2b..04ccf4af6 100644
> --- a/drivers/bus/fslmc/fslmc_vfio.c
> +++ b/drivers/bus/fslmc/fslmc_vfio.c
> @@ -448,11 +448,14 @@ fslmc_vfio_setup_device(const char *sysfs_base,
> const char *dev_addr,
>
> /* get the actual group fd */
> vfio_group_fd = rte_vfio_get_group_fd(iommu_group_no);
> - if (vfio_group_fd < 0)
> + if (vfio_group_fd < 0 && vfio_group_fd != -ENOENT)
> return -1;
>
> - /* if group_fd == 0, that means the device isn't managed by VFIO */
> - if (vfio_group_fd == 0) {
> + /*
> + * if vfio_group_fd == -ENOENT, that means the device
> + * isn't managed by VFIO
> + */
> + if (vfio_group_fd == -ENOENT) {
> RTE_LOG(WARNING, EAL, " %s not managed by VFIO driver,
> skipping\n",
> dev_addr);
> return 1;
> --
> 2.23.0
>
