linux-kernel - Re: uefi boot hang (bisected)

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Message-ID: <51DD553B.1080701@intel.com>
Date:	Wed, 10 Jul 2013 13:36:11 +0100
From:	Matt Fleming <matt.fleming@...el.com>
To:	Dave Young <dyoung@...hat.com>
CC:	lkml <linux-kernel@...r.kernel.org>,
	Matthew Garrett <matthew.garrett@...ula.com>
Subject: Re: uefi boot hang (bisected)

On 10/07/13 07:36, Dave Young wrote:
> Another problem is: With this patch applied I tried noefi boot, but
> kernel paniced, looks like efivar_init depends on efi runtime. Below
> patches works for me about noefi boot though I'm not sure if it's a
> right fix, please review.

It makes more sense to check in efivars.c, since none of that file can
function without runtime serivces.

Could you try the following patch?

---

diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 8bd1bb6..8a7432a 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -583,6 +583,9 @@ int efivars_sysfs_init(void)
 	struct kobject *parent_kobj = efivars_kobject();
 	int error = 0;
 
+	if (!efi_enabled(EFI_RUNTIME_SERVICES))
+		return -ENODEV;
+
 	/* No efivars has been registered yet */
 	if (!parent_kobj)
 		return 0;
--
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