linux-kernel - [PATCH v3] video: fbdev: vesafb: add missed release

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Date:   Tue, 10 Mar 2020 10:35:36 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH v3] video: fbdev: vesafb: add missed release_region

The driver forgets to free the I/O region in remove and probe
failure.
Add the missed calls to fix it.

Signed-off-by: Chuhong Yuan <hslester96@...il.com>
---
Changes in v3:
  - Revise the commit message.
  - Add an error handler to suit the "goto error" before request_region().
  - Revise the order of operations in remove.
  
 drivers/video/fbdev/vesafb.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c
index a1fe24ea869b..c7bc9ace47d4 100644
--- a/drivers/video/fbdev/vesafb.c
+++ b/drivers/video/fbdev/vesafb.c
@@ -439,7 +439,7 @@ static int vesafb_probe(struct platform_device *dev)
 		       "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 			vesafb_fix.smem_len, vesafb_fix.smem_start);
 		err = -EIO;
-		goto err;
+		goto err_release_region;
 	}
 
 	printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
@@ -458,15 +458,17 @@ static int vesafb_probe(struct platform_device *dev)
 
 	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 		err = -ENOMEM;
-		goto err;
+		goto err_release_region;
 	}
 	if (register_framebuffer(info)<0) {
 		err = -EINVAL;
 		fb_dealloc_cmap(&info->cmap);
-		goto err;
+		goto err_release_region;
 	}
 	fb_info(info, "%s frame buffer device\n", info->fix.id);
 	return 0;
+err_release_region:
+	release_region(0x3c0, 32);
 err:
 	arch_phys_wc_del(par->wc_cookie);
 	if (info->screen_base)
@@ -481,6 +483,7 @@ static int vesafb_remove(struct platform_device *pdev)
 	struct fb_info *info = platform_get_drvdata(pdev);
 
 	unregister_framebuffer(info);
+	release_region(0x3c0, 32);
 	framebuffer_release(info);
 
 	return 0;
-- 
2.25.1