Hi,
On 10/27/20 2:51 PM, Hans de Goede wrote:
> Add missing pci_iounmap() calls to properly unmap the memory on
> probe-failure and remove.
>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
For some reason the spam-filter used by Red Hat's email system has eaten
Daniel Vetter's reply to this, so let me copy and paste that from patchwork:
Daniel Vetter wrote:
> I think switching over to devm would be really nice. And for pci all
> you need to do is use pcim_enable_device and delete all the cleanup
> code, and it's all done. Hand rolling device cleanup code really isn't
> a great idea and way too error-prone. Plus you're using lots of devm_
> already.
Good point, so I just checked and the vboxvideo code is already
using pcim_enable_device() so it looks like this is a false-positive
from the lkp@xxxxxxxxx bot, and Dan Carpenter missed that pcim_enable_device()
makes all subsequent pci-resource acquiring calls behave like devm calls,
when he forwarded the report to me.
Tl;DR: there is no bug / leak and this patch can be dropped.
Is there a place where I can report a bug against the lkp@xxxxxxxxx bot
for this false-positive ?
Regards,
Hans
> ---
> drivers/gpu/drm/vboxvideo/vbox_main.c | 23 ++++++++++++++++-------
> 1 file changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/vboxvideo/vbox_main.c b/drivers/gpu/drm/vboxvideo/vbox_main.c
> index d68d9bad7674..2eeb1d3be54a 100644
> --- a/drivers/gpu/drm/vboxvideo/vbox_main.c
> +++ b/drivers/gpu/drm/vboxvideo/vbox_main.c
> @@ -71,6 +71,8 @@ static void vbox_accel_fini(struct vbox_private *vbox)
>
> for (i = 0; i < vbox->num_crtcs; ++i)
> vbva_disable(&vbox->vbva_info[i], vbox->guest_pool, i);
> +
> + pci_iounmap(vbox->ddev.pdev, vbox->vbva_buffers);
> }
>
> /* Do we support the 4.3 plus mode hint reporting interface? */
> @@ -124,19 +126,19 @@ int vbox_hw_init(struct vbox_private *vbox)
> vbox->guest_pool = devm_gen_pool_create(vbox->ddev.dev, 4, -1,
> "vboxvideo-accel");
> if (!vbox->guest_pool)
> - return -ENOMEM;
> + goto out_unmap_guest_heap;
>
> ret = gen_pool_add_virt(vbox->guest_pool,
> (unsigned long)vbox->guest_heap,
> GUEST_HEAP_OFFSET(vbox),
> GUEST_HEAP_USABLE_SIZE, -1);
> if (ret)
> - return ret;
> + goto out_unmap_guest_heap;
>
> ret = hgsmi_test_query_conf(vbox->guest_pool);
> if (ret) {
> DRM_ERROR("vboxvideo: hgsmi_test_query_conf failed\n");
> - return ret;
> + goto out_unmap_guest_heap;
> }
>
> /* Reduce available VRAM size to reflect the guest heap. */
> @@ -148,23 +150,30 @@ int vbox_hw_init(struct vbox_private *vbox)
>
> if (!have_hgsmi_mode_hints(vbox)) {
> ret = -ENOTSUPP;
> - return ret;
> + goto out_unmap_guest_heap;
> }
>
> vbox->last_mode_hints = devm_kcalloc(vbox->ddev.dev, vbox->num_crtcs,
> sizeof(struct vbva_modehint),
> GFP_KERNEL);
> - if (!vbox->last_mode_hints)
> - return -ENOMEM;
> + if (!vbox->last_mode_hints) {
> + ret = -ENOMEM;
> + goto out_unmap_guest_heap;
> + }
>
> ret = vbox_accel_init(vbox);
> if (ret)
> - return ret;
> + goto out_unmap_guest_heap;
>
> return 0;
> +
> +out_unmap_guest_heap:
> + pci_iounmap(vbox->ddev.pdev, vbox->guest_pool);
> + return ret;
> }
>
> void vbox_hw_fini(struct vbox_private *vbox)
> {
> vbox_accel_fini(vbox);
> + pci_iounmap(vbox->ddev.pdev, vbox->guest_pool);
> }
>
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