[PATCH v1 1/2] accel/rocket: Fix prep_bo ioctl leaking positive return from dma_resv_wait_timeout()

[Gyeyoung Baek]

dma_resv_wait_timeout() returns a positive 'remaining jiffies' value
on success, 0 on timeout, and -errno on failure.

rocket_ioctl_prep_bo() returns this 'long' result from an int-typed
ioctl handler, so positive values reach userspace as bogus errors.
Explicitly set ret to 0 on the success path.

Fixes: 525ad89dd904 ("accel/rocket: Add IOCTLs for synchronizing memory accesses")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Gyeyoung Baek <gye976@xxxxxxxxx>
---
 drivers/accel/rocket/rocket_gem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/accel/rocket/rocket_gem.c b/drivers/accel/rocket/rocket_gem.c
index b6a385d2e..c80847192 100644
--- a/drivers/accel/rocket/rocket_gem.c
+++ b/drivers/accel/rocket/rocket_gem.c
@@ -145,6 +145,8 @@ int rocket_ioctl_prep_bo(struct drm_device *dev, void *data, struct drm_file *fi
 	ret = dma_resv_wait_timeout(gem_obj->resv, DMA_RESV_USAGE_WRITE, true, timeout);
 	if (!ret)
 		ret = timeout ? -ETIMEDOUT : -EBUSY;
+	else if (ret > 0)
+		ret = 0;
 
 	shmem_obj = &to_rocket_bo(gem_obj)->base;
 
-- 
2.43.0