4.19-stable review patch. If anyone has any objections, please let me know.
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From: Sam Bobroff sbobroff@linux.ibm.com
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@linux.ibm.com Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie airlied@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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 @@ -583,7 +583,8 @@ void 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); }