[Intel-gfx] [PATCH 2/3] drm/i915/bios: fold pci rom map/unmap into copy function

[Lucas De Marchi]

We don't need to keep the pci rom mapped during the entire
intel_bios_init() anymore. Move it to the previous copy_vbt() function
and rename it to oprom_get_vbt() since now it's responsible to to all
operations related to get the vbt from the oprom.

v2: fix double __iomem attribute detected by sparse

Signed-off-by: Lucas De Marchi <lucas.demar...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_bios.c | 40 +++++++++++------------
 1 file changed, 19 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c 
b/drivers/gpu/drm/i915/display/intel_bios.c
index 8bdfc1d55040..aa9b182efee5 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -1896,12 +1896,17 @@ bool intel_bios_is_valid_vbt(const void *buf, size_t 
size)
        return vbt;
 }
 
-static struct vbt_header *copy_vbt(void __iomem *oprom, size_t size)
+static struct vbt_header *oprom_get_vbt(struct drm_i915_private *dev_priv)
 {
-       void __iomem *p = NULL;
+       struct pci_dev *pdev = dev_priv->drm.pdev;
+       void __iomem *p = NULL, *oprom;
        struct vbt_header *vbt;
        u16 vbt_size;
-       size_t i;
+       size_t i, size;
+
+       oprom = pci_map_rom(pdev, &size);
+       if (!oprom)
+               return NULL;
 
        /* Scour memory looking for the VBT signature. */
        for (i = 0; i + 4 < size; i++) {
@@ -1914,23 +1919,23 @@ static struct vbt_header *copy_vbt(void __iomem *oprom, 
size_t size)
        }
 
        if (!p)
-               return NULL;
+               goto err_unmap_oprom;
 
        if (sizeof(struct vbt_header) > size) {
                DRM_DEBUG_DRIVER("VBT header incomplete\n");
-               return NULL;
+               goto err_unmap_oprom;
        }
 
        vbt_size = ioread16(p + offsetof(struct vbt_header, vbt_size));
        if (vbt_size > size) {
                DRM_DEBUG_DRIVER("VBT incomplete (vbt_size overflows)\n");
-               return NULL;
+               goto err_unmap_oprom;
        }
 
        /* The rest will be validated by intel_bios_is_valid_vbt() */
        vbt = kmalloc(vbt_size, GFP_KERNEL);
        if (!vbt)
-               return NULL;
+               goto err_unmap_oprom;
 
        memcpy_fromio(vbt, p, vbt_size);
 
@@ -1941,6 +1946,8 @@ static struct vbt_header *copy_vbt(void __iomem *oprom, 
size_t size)
 
 err_free_vbt:
        kfree(vbt);
+err_unmap_oprom:
+       pci_unmap_rom(pdev, oprom);
 
        return NULL;
 }
@@ -1955,10 +1962,9 @@ static struct vbt_header *copy_vbt(void __iomem *oprom, 
size_t size)
  */
 void intel_bios_init(struct drm_i915_private *dev_priv)
 {
-       struct pci_dev *pdev = dev_priv->drm.pdev;
        const struct vbt_header *vbt = dev_priv->opregion.vbt;
+       struct vbt_header *oprom_vbt = NULL;
        const struct bdb_header *bdb;
-       u8 __iomem *oprom = NULL;
 
        INIT_LIST_HEAD(&dev_priv->vbt.display_devices);
 
@@ -1971,15 +1977,11 @@ void intel_bios_init(struct drm_i915_private *dev_priv)
 
        /* If the OpRegion does not have VBT, look in PCI ROM. */
        if (!vbt) {
-               size_t size;
-
-               oprom = pci_map_rom(pdev, &size);
-               if (!oprom)
+               oprom_vbt = oprom_get_vbt(dev_priv);
+               if (!oprom_vbt)
                        goto out;
 
-               vbt = copy_vbt(oprom, size);
-               if (!vbt)
-                       goto out;
+               vbt = oprom_vbt;
 
                DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
        }
@@ -2012,11 +2014,7 @@ void intel_bios_init(struct drm_i915_private *dev_priv)
                init_vbt_missing_defaults(dev_priv);
        }
 
-       if (oprom)
-               pci_unmap_rom(pdev, oprom);
-
-       if (vbt != dev_priv->opregion.vbt)
-               kfree(vbt);
+       kfree(oprom_vbt);
 }
 
 /**
-- 
2.24.0

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