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msm: kgsl: prevent multiple or partial mmaps of a buffer

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These cases have never been a normal operation pattern of the
userspace driver. Sharing buffers through multiple mappings
is better left to dma-buf or ion.

Change-Id: I7e7658137937c96b9505d0f912dcb262d652e0c3
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
Signed-off-by: Sakshi Agrawal <sakshia@codeaurora.org>
This commit is contained in:
Sakshi Agrawal 2012-10-17 15:48:57 -06:00 committed by Iliyan Malchev
parent 3c42303206
commit 1b458c08b7
1 changed files with 22 additions and 2 deletions
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24
drivers/gpu/msm/kgsl.c
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@ -2110,6 +2110,8 @@ static void
kgsl_gpumem_vm_close(struct vm_area_struct *vma)
{
struct kgsl_mem_entry *entry = vma->vm_private_data;
entry->memdesc.useraddr = 0;
kgsl_mem_entry_put(entry);
}
@ -2121,6 +2123,7 @@ static struct vm_operations_struct kgsl_gpumem_vm_ops = {
static int kgsl_mmap(struct file *file, struct vm_area_struct *vma)
{
unsigned int ret;
unsigned long vma_offset = vma->vm_pgoff << PAGE_SHIFT;
struct kgsl_device_private *dev_priv = file->private_data;
struct kgsl_process_private *private = dev_priv->process_priv;
@ -2147,8 +2150,20 @@ static int kgsl_mmap(struct file *file, struct vm_area_struct *vma)
if (!entry->memdesc.ops ||
!entry->memdesc.ops->vmflags ||
!entry->memdesc.ops->vmfault)
return -EINVAL;
!entry->memdesc.ops->vmfault) {
ret = -EINVAL;
goto err_put;
}
if (entry->memdesc.useraddr != 0) {
ret = -EBUSY;
goto err_put;
}
if (entry->memdesc.size != (vma->vm_end - vma->vm_start)) {
ret = -ERANGE;
goto err_put;
}
vma->vm_flags |= entry->memdesc.ops->vmflags(&entry->memdesc);
@ -2157,7 +2172,12 @@ static int kgsl_mmap(struct file *file, struct vm_area_struct *vma)
vma->vm_ops = &kgsl_gpumem_vm_ops;
vma->vm_file = file;
entry->memdesc.useraddr = vma->vm_start;
return 0;
err_put:
kgsl_mem_entry_put(entry);
return ret;
}
static irqreturn_t kgsl_irq_handler(int irq, void *data)