linux-kernel - [PATCH v1] video: fbdev: sm712fb: fix an issue about iounmap for a wrong address

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Message-Id: <20200422160719.27763-1-zhengdejin5@gmail.com>
Date:   Thu, 23 Apr 2020 00:07:19 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
        b.zolnierkie@...sung.com, gregkh@...uxfoundation.org,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH v1] video: fbdev: sm712fb: fix an issue about iounmap for a wrong address

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@...il.com>
Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
 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 6a1b4a853d9e..8cd655d6d628 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;
 	}
-- 
2.25.0