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habanalabs: clear vm_pgoff before doing the mmap

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The driver use vm_pgoff to hold the CB idr handle. Before we actually call
the mapping function, we need to clear the handle so there won't be any
garbage left in vm_pgoff.

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Oded Gabbay 2020-08-29 11:55:15 +03:00
parent 3174ac9bb1
commit c5e0ec66f0
1 changed files with 4 additions and 0 deletions
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4
drivers/misc/habanalabs/common/command_buffer.c
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@ -304,7 +304,11 @@ int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
u32 handle, user_cb_size;
int rc;
/* We use the page offset to hold the idr and thus we need to clear
* it before doing the mmap itself
*/
handle = vma->vm_pgoff;
vma->vm_pgoff = 0;
/* reference was taken here */
cb = hl_cb_get(hdev, &hpriv->cb_mgr, handle);