linux-kernel - [GIT PULL] EFI fix

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Message-ID: <20190518091726.GA47721@gmail.com>
Date:   Sat, 18 May 2019 11:17:26 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        James Morse <james.morse@....com>,
        Matt Fleming <matt@...eblueprint.co.uk>
Subject: [GIT PULL] EFI fix

Linus,

Please pull the latest efi-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git efi-urgent-for-linus

   # HEAD: f8585539df0a1527c78b5d760665c89fe1c105a9 fbdev/efifb: Ignore framebuffer memmap entries that lack any memory types

Fix an EFI-fb regression that affects certain x86 systems.

 Thanks,

	Ingo

------------------>
Ard Biesheuvel (1):
      fbdev/efifb: Ignore framebuffer memmap entries that lack any memory types


 drivers/video/fbdev/efifb.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
index 9e529cc2b4ff..9f39f0c360e0 100644
--- a/drivers/video/fbdev/efifb.c
+++ b/drivers/video/fbdev/efifb.c
@@ -477,8 +477,12 @@ static int efifb_probe(struct platform_device *dev)
 		 * If the UEFI memory map covers the efifb region, we may only
 		 * remap it using the attributes the memory map prescribes.
 		 */
-		mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
-		mem_flags &= md.attribute;
+		md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
+				EFI_MEMORY_WT | EFI_MEMORY_WB;
+		if (md.attribute) {
+			mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
+			mem_flags &= md.attribute;
+		}
 	}
 	if (mem_flags & EFI_MEMORY_WC)
 		info->screen_base = ioremap_wc(efifb_fix.smem_start,