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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
        Teddy Wang <teddy.wang@siliconmotion.com>,
        Dejin Zheng <zhengdejin5@gmail.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.7 131/393] video: fbdev: sm712fb: fix an issue about iounmap for a wrong address
Date:   Mon, 17 Aug 2020 17:13:01 +0200
Message-Id: <20200817143825.963891853@linuxfoundation.org>
In-Reply-To: <20200817143819.579311991@linuxfoundation.org>
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From: Dejin Zheng <zhengdejin5@gmail.com>

[ Upstream commit 98bd4f72988646c35569e1e838c0ab80d06c77f6 ]

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: 1461d6672864854 ("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>
---
 drivers/video/fbdev/sm712fb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/fbdev/sm712fb.c b/drivers/video/fbdev/sm712fb.c
index 6a1b4a853d9ee..8cd655d6d6280 100644
--- a/drivers/video/fbdev/sm712fb.c
+++ b/drivers/video/fbdev/sm712fb.c
@@ -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;
 	}
-- 
2.25.1