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video: fbdev: imxfb: always allocate 256 entries for the color map 

The current code calculates the number of color map entries as
1 << info->var.bits_per_pixel. For 32bpp modes, 1 << 32 is 0 when
written to an int variable. As a consequence, the subsequent copying
of the default (non-empty) color map into our newly allocated color map
fails and imxfb's probe function returns an error.

On both imx1 and imx21 platforms, the color map is used only for modes
with <= 8bpp. By allocating 256 entries for the color map, we're on the
safe side.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
This commit is contained in:
Martin Kaiser 2017-01-11 17:09:50 +01:00 committed by Bartlomiej Zolnierkiewicz
parent d67fa87de0
commit dc312120b7
1 changed files with 5 additions and 1 deletions
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6
drivers/video/fbdev/imxfb.c
View File

@ -985,7 +985,11 @@ static int imxfb_probe(struct platform_device *pdev)
*/
imxfb_check_var(&info->var, info);
ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
/*
* For modes > 8bpp, the color map is bypassed.
* Therefore, 256 entries are enough.
*/
ret = fb_alloc_cmap(&info->cmap, 256, 0);
if (ret < 0)
goto failed_cmap;