[PATCH 10/10] drm/vboxvideo: fix mapping leaks

Philipp Stanner
2024-01-15T14:47:39Z

When the managed PCI-API was introduced to this driver, it was falsly
assumed that initializing the device with pcim_enable_device() instead
of pci_enable_device() will make all PCI functions managed.

This is wrong and was caused by the quite confusing devres API for PCI:
The function pci_iomap_range() is never managed.

Replace pci_iomap_range() with the actually managed function
pcim_iomap_range().

Additionally, add a call to pcim_request_region() to ensure exclusive
access to BAR 0.

CC: <stable@kernel.vger.org> # v5.10+
Fixes: 8558de401b5f ("drm/vboxvideo: use managed pci functions")
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
drivers/gpu/drm/vboxvideo/vbox_main.c | 24 +++++++++++++-----------
1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/vboxvideo/vbox_main.c b/drivers/gpu/drm/vboxvideo/vbox_main.c
index 42c2d8a99509..7f686a0190e6 100644
--- a/drivers/gpu/drm/vboxvideo/vbox_main.c
+++ b/drivers/gpu/drm/vboxvideo/vbox_main.c
@@ -42,12 +42,11 @@ static int vbox_accel_init(struct vbox_private *vbox)
/* Take a command buffer for each screen from the end of usable VRAM. */
vbox->available_vram_size -= vbox->num_crtcs * VBVA_MIN_BUFFER_SIZE;

- vbox->vbva_buffers = pci_iomap_range(pdev, 0,
- vbox->available_vram_size,
- vbox->num_crtcs *
- VBVA_MIN_BUFFER_SIZE);
- if (!vbox->vbva_buffers)
- return -ENOMEM;
+ vbox->vbva_buffers = pcim_iomap_range(
+ pdev, 0, vbox->available_vram_size,
+ vbox->num_crtcs * VBVA_MIN_BUFFER_SIZE);
+ if (IS_ERR(vbox->vbva_buffers))
+ return PTR_ERR(vbox->vbva_buffers);

for (i = 0; i < vbox->num_crtcs; ++i) {
vbva_setup_buffer_context(&vbox->vbva_info[i],
@@ -115,12 +114,15 @@ int vbox_hw_init(struct vbox_private *vbox)

DRM_INFO("VRAM %08x\n", vbox->full_vram_size);

+ ret = pcim_request_region(pdev, 0, "vboxvideo");
+ if (ret)
+ return ret;
+
/* Map guest-heap at end of vram */
- vbox->guest_heap =
- pci_iomap_range(pdev, 0, GUEST_HEAP_OFFSET(vbox),
- GUEST_HEAP_SIZE);
- if (!vbox->guest_heap)
- return -ENOMEM;
+ vbox->guest_heap = pcim_iomap_range(pdev, 0,
+ GUEST_HEAP_OFFSET(vbox), GUEST_HEAP_SIZE);
+ if (IS_ERR(vbox->guest_heap))
+ return PTR_ERR(vbox->guest_heap);

/* Create guest-heap mem-pool use 2^4 = 16 byte chunks */
vbox->guest_pool = devm_gen_pool_create(vbox->ddev.dev, 4, -1,
--
2.43.0