linux-kernel - Re: [PATCH] firmware/sysfb: Fix wrong stride when bits-per-pixel is calculated

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Date:   Thu, 13 Apr 2023 01:13:05 +0000
From:   pa@...ix.com (Pierre Asselin)
To:     pa@...ix.com, javierm@...hat.com
Cc:     tzimmermann@...e.de, pa@...ix.com, linux-kernel@...r.kernel.org,
        jfalempe@...hat.com, hdegoede@...hat.com,
        dri-devel@...ts.freedesktop.org, daniel.vetter@...ll.ch,
        ardb@...nel.org
Subject: Re: [PATCH] firmware/sysfb: Fix wrong stride when bits-per-pixel is
 calculated

After careful reading of the comments in f35cd3fa7729, would this
be an appropriate fix ?  Does it still address all the issues raised
by Thomas ?

(not tested)

diff --git a/drivers/firmware/sysfb_simplefb.c b/drivers/firmware/sysfb_simplefb.c
index 82c64cb9f531..9f5299d54732 100644
--- a/drivers/firmware/sysfb_simplefb.c
+++ b/drivers/firmware/sysfb_simplefb.c
@@ -56,10 +56,11 @@ __init bool sysfb_parse_mode(const struct screen_info *si,
 	 * don't specify alpha channels.
 	 */
 	if (si->lfb_depth > 8) {
-		bits_per_pixel = max(max3(si->red_size + si->red_pos,
+		bits_per_pixel = max3(max3(si->red_size + si->red_pos,
 					  si->green_size + si->green_pos,
 					  si->blue_size + si->blue_pos),
-				     si->rsvd_size + si->rsvd_pos);
+				     si->rsvd_size + si->rsvd_pos,
+				     si->lfb_depth);
 	} else {
 		bits_per_pixel = si->lfb_depth;
 	}