fbdev: vt8500lcdfb: fix missing dma_free_coherent()

[ Upstream commit 88b3b99 ]

fbi->fb.screen_buffer is allocated with dma_alloc_coherent() but is not
freed if the error path is reached.

Fixes: e7b9953 ("video: vt8500: Add devicetree support for vt8500-fb and wm8505-fb")
Cc: <stable@vger.kernel.org>
Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Thomas-fourier

drivers/video/fbdev/vt8500lcdfb.c

@@ -369,7 +369,7 @@ static int vt8500lcd_probe(struct platform_device *pdev)
 	if (fbi->palette_cpu == NULL) {
 		dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
 		ret = -ENOMEM;
-		goto failed_free_io;
+		goto failed_free_mem_virt;
 	}
 
 	irq = platform_get_irq(pdev, 0);
@@ -432,6 +432,9 @@ static int vt8500lcd_probe(struct platform_device *pdev)
 failed_free_palette:
 	dma_free_coherent(&pdev->dev, fbi->palette_size,
 			  fbi->palette_cpu, fbi->palette_phys);
+failed_free_mem_virt:
+	dma_free_coherent(&pdev->dev, fbi->fb.fix.smem_len,
+			  fbi->fb.screen_buffer, fbi->fb.fix.smem_start);
 failed_free_io:
 	iounmap(fbi->regbase);
 failed_free_res: