4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sam Bobroff <sbobroff@xxxxxxxxxxxxx>
commit dc25ab067645eabd037f1a23d49a666f9e0b8c68 upstream.
If the platform has no IO space, ioregs is placed next to the already
allocated regs. In this case, it should not be separately freed.
This prevents a kernel warning from __vunmap "Trying to vfree()
nonexistent vm area" when unloading the driver.
Fixes: 0dd68309b9c5 ("drm/ast: Try to use MMIO registers when PIO isn't supported")
Signed-off-by: Sam Bobroff <sbobroff@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/ast/ast_main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -556,7 +556,8 @@ int ast_driver_unload(struct drm_device
drm_mode_config_cleanup(dev);
ast_mm_fini(ast);
- pci_iounmap(dev->pdev, ast->ioregs);
+ if (ast->ioregs != ast->regs + AST_IO_MM_OFFSET)
+ pci_iounmap(dev->pdev, ast->ioregs);
pci_iounmap(dev->pdev, ast->regs);
kfree(ast);
return 0;
