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| author |   Michael Kelley <mhklinux@outlook.com> | 2025-02-09 15:52:52 -0800 |
|---|---|---|
| committer |   Wei Liu <wei.liu@kernel.org> | 2025-02-21 19:45:02 +0000 |
| commit | 7241c886a71797cc51efc6fadec7076fcf6435c2 (patch) | |
| tree | 48395336e30adce7faee8c8e36d2245d2664d829 | |
| parent | x86/hyperv/vtl: Stop kernel from probing VTL0 low memory (diff) | |
| download | wireguard-linux-7241c886a71797cc51efc6fadec7076fcf6435c2.tar.xz wireguard-linux-7241c886a71797cc51efc6fadec7076fcf6435c2.zip | |
fbdev: hyperv_fb: iounmap() the correct memory when removing a device
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@outlook.com>
Reviewed-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250209235252.2987-1-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250209235252.2987-1-mhklinux@outlook.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/video/fbdev/hyperv_fb.c | 2 |
1 files changed, 1 insertions, 1 deletions
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, |