[PATCH V10 8/9] vfio: platform: check reset call return code during open

Sinan Kaya
2016-07-18T23:09:26Z

Open call is ignoring the return code from reset call and can
potentially continue even though reset call failed.

If reset_required module parameter is set, this patch is going
to validate the return code and will abort open if reset fails.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Reviewed-by: Baptiste Reynal <b.reynal@virtualopensystems.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
---
drivers/vfio/platform/vfio_platform_common.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index 16709f3..cd785a9 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -256,6 +256,8 @@ static int vfio_platform_open(void *device_data)
mutex_lock(&driver_lock);

if (!vdev->refcnt) {
+ const char *extra_dbg = NULL;
+
ret = vfio_platform_regions_init(vdev);
if (ret)
goto err_reg;
@@ -264,7 +266,12 @@ static int vfio_platform_open(void *device_data)
if (ret)
goto err_irq;

- vfio_platform_call_reset(vdev, NULL);
+ ret = vfio_platform_call_reset(vdev, &extra_dbg);
+ if (ret && vdev->reset_required) {
+ dev_warn(vdev->device, "reset driver is required and reset call failed in open (%d) %s\n",
+ ret, extra_dbg ? extra_dbg : "");
+ goto err_rst;
+ }
}

vdev->refcnt++;
@@ -272,6 +279,8 @@ static int vfio_platform_open(void *device_data)
mutex_unlock(&driver_lock);
return 0;

+err_rst:
+ vfio_platform_irq_cleanup(vdev);
err_irq:
vfio_platform_regions_cleanup(vdev);
err_reg:
--
1.8.2.1