gpu: host1x: Fix iommu_map_sgtable() return value check

[ Upstream commit 18f7476 ]

Commit "iommu: return full error code from iommu_map_sg[_atomic]()"
changed iommu_map_sgtable() to return an ssize_t and negative values
in error cases, rather than a size_t and a zero.

pin_job() also was incorrectly assigning to 'int', which could cause
overflows into negative values.

Update pin_job() to correctly check for errors from iommu_map_sgtable.

Fixes: ad8f36e ("iommu: return full error code from iommu_map_sg[_atomic]()")
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patch.msgid.link/20260421-iommu_map_sgtable-return-v1-1-fb484c07d2a1@nvidia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: cyndis

drivers/gpu/host1x/job.c

@@ -235,6 +235,8 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
 		}
 
 		if (host->domain) {
+			ssize_t map_err;
+
 			for_each_sgtable_sg(map->sgt, sg, j)
 				gather_size += sg->length;
 
@@ -248,11 +250,11 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
 				goto put;
 			}
 
-			err = iommu_map_sgtable(host->domain, iova_dma_addr(&host->iova, alloc),
-						map->sgt, IOMMU_READ);
-			if (err == 0) {
+			map_err = iommu_map_sgtable(host->domain, iova_dma_addr(&host->iova, alloc),
+						    map->sgt, IOMMU_READ);
+			if (map_err < 0) {
 				__free_iova(&host->iova, alloc);
-				err = -EINVAL;
+				err = map_err;
 				goto put;
 			}