[PATCH V6 7/8] vfio: platform: check reset call return code during open

Sinan Kaya
2016-05-28T22:01:17Z

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>
---
drivers/vfio/platform/vfio_platform_common.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index e87ceab..962cfb1 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -264,6 +264,8 @@ 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;
@@ -272,7 +274,12 @@ 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_irq;
+ }
}

vdev->refcnt++;
--
1.8.2.1