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>
---
drivers/video/fbdev/hyperv_fb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index 7fdb5edd7e2e..363e4ccfcdb7 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -1080,7 +1080,7 @@ static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info)
if (par->need_docopy) {
vfree(par->dio_vp);
- iounmap(info->screen_base);
+ iounmap(par->mmio_vp);
vmbus_free_mmio(par->mem->start, screen_fb_size);
} else {
hvfb_release_phymem(hdev, info->fix.smem_start,
--
2.25.1
