[media] omap3isp: Defer probe when the IOMMU is not available

When the OMAP3 ISP driver is compiled in the kernel the device can be
probed before the corresponding IOMMU is available. Defer the probe in
that case, and fix a crash in the error path.

Reported-by: Javier Martin <javier.martin@vista-silicon.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index 5a04077b362b5986738a76fd6df39043bbf13216..ff5a20afa6916d09e6d6fb75bef9a4668fe73d07 100644 (file)
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -2249,6 +2249,7 @@ static int isp_probe(struct platform_device *pdev)
        ret = iommu_attach_device(isp->domain, &pdev->dev);
        if (ret) {
                dev_err(&pdev->dev, "can't attach iommu device: %d\n", ret);
+               ret = -EPROBE_DEFER;
                goto free_domain;
        }
 
@@ -2287,6 +2288,7 @@ detach_dev:
        iommu_detach_device(isp->domain, &pdev->dev);
 free_domain:
        iommu_domain_free(isp->domain);
+       isp->domain = NULL;
 error_isp:
        isp_xclk_cleanup(isp);
        omap3isp_put(isp);