On Sun, Feb 09, 2025 at 03:52:52PM -0800, mhkelley58@xxxxxxxxx wrote:
> From: Michael Kelley <mhklinux@xxxxxxxxxxx>
>
> When a Hyper-V framebuffer device is removed, or the driver is unbound
> from a device, any allocated and/or mapped memory must be released. In
> particular, MMIO address space that was mapped to the framebuffer must
> be unmapped. Current code unmaps the wrong address, resulting in an
> error like:
>
> [ 4093.980597] iounmap: bad address 00000000c936c05c
>
> followed by a stack dump.
>
> Commit d21987d709e8 ("video: hyperv: hyperv_fb: Support deferred IO for
> Hyper-V frame buffer driver") changed the kind of address stored in
> info->screen_base, and the iounmap() call in hvfb_putmem() was not
> updated accordingly.
>
> Fix this by updating hvfb_putmem() to unmap the correct address.
>
> Fixes: d21987d709e8 ("video: hyperv: hyperv_fb: Support deferred IO for Hyper-V frame buffer driver")
> Signed-off-by: Michael Kelley <mhklinux@xxxxxxxxxxx>
Applied to hyperv-fixes. Thanks.
