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video: fbdev: sm712fb: fix an issue about iounmap for a wrong address 

[ Upstream commit 98bd4f7298 ]

the sfb->fb->screen_base is not save the value get by iounmap() when
the chip id is 0x720. so iounmap() for address sfb->fb->screen_base
is not right.

Fixes: 1461d66728 ("staging: sm7xxfb: merge sm712fb with fbdev")
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Teddy Wang <teddy.wang@siliconmotion.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200422160719.27763-1-zhengdejin5@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Dejin Zheng 2020-04-23 00:07:19 +08:00 committed by Greg Kroah-Hartman
parent d9e13b0c26
commit e95d33905a
1 changed files with 2 additions and 0 deletions
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2
drivers/video/fbdev/sm712fb.c
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@ -1429,6 +1429,8 @@ static int smtc_map_smem(struct smtcfb_info *sfb,
static void smtc_unmap_smem(struct smtcfb_info *sfb)
{
if (sfb && sfb->fb->screen_base) {
if (sfb->chip_id == 0x720)
sfb->fb->screen_base -= 0x00200000;
iounmap(sfb->fb->screen_base);
sfb->fb->screen_base = NULL;
}