Patch "efi/esrt: Cleanup bad memory map log messages" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

efi/esrt: Cleanup bad memory map log messages

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
efi-esrt-cleanup-bad-memory-map-log-messages.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Daniel Drake <[email protected]>
Date: Tue, 7 Feb 2017 13:08:23 -0600
Subject: efi/esrt: Cleanup bad memory map log messages

From: Daniel Drake <[email protected]>

[ Upstream commit 822f5845f710e57d7e2df1fd1ee00d6e19d334fe ]

The Intel Compute Stick STCK1A8LFC and Weibu F3C platforms both log 2 error messages during boot:

efi: requested map not found.
esrt: ESRT header is not in the memory map.

Searching the web, this seems to affect many other platforms too. Since these messages are logged as errors, they appear on-screen during the boot process even when using the "quiet" boot parameter used by distros.

Demote the ESRT error to a warning so that it does not appear on-screen, and delete the error logging from efi_mem_desc_lookup; both callsites of that function log more specific messages upon failure.

Out of curiosity I looked closer at the Weibu F3C. There is no entry in the UEFI-provided memory map which corresponds to the ESRT pointer, but hacking the code to map it anyway, the ESRT does appear to be valid with 2 entries.

---
 drivers/firmware/efi/efi.c  |    1 -
 drivers/firmware/efi/esrt.c |    2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

@@ -384,7 +384,6 @@ int __init efi_mem_desc_lookup(u64 phys_
 			return 0;
 		}
 	}
-	pr_err_once("requested map not found.\n");
 	return -ENOENT;
 }
 

@@ -251,7 +251,7 @@ void __init efi_esrt_init(void)
 
 	rc = efi_mem_desc_lookup(efi.esrt, &md);
 	if (rc < 0) {
-		pr_err("ESRT header is not in the memory map.\n");
+		pr_warn("ESRT header is not in the memory map.\n");
 		return;
 	}
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/efi-esrt-cleanup-bad-memory-map-log-messages.patch