gpu: host1x: Check whether size of unpin isn't 0

Only gather pins are mapped by the Host1x driver, regular BO relocations
are not. Check whether size of unpin isn't 0, otherwise IOVA allocation at
0x0 could be erroneously released.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c
index e2f4a4d93d2012f3d21ea59271732c84a80189a0..527a1cddb14fd5d2a23fa96559ed0e33c54bd690 100644 (file)
--- a/drivers/gpu/host1x/job.c
+++ b/drivers/gpu/host1x/job.c
@@ -569,7 +569,8 @@ void host1x_job_unpin(struct host1x_job *job)
        for (i = 0; i < job->num_unpins; i++) {
                struct host1x_job_unpin_data *unpin = &job->unpins[i];
 
-               if (!IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) && host->domain) {
+               if (!IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) &&
+                   unpin->size && host->domain) {
                        iommu_unmap(host->domain, job->addr_phys[i],
                                    unpin->size);
                        free_iova(&host->iova,