linux-kernel - Re: [PATCH 08/15] efi/x86: Move command-line initrd loading to efi

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Date:   Wed, 27 May 2020 18:46:57 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     "Williams, Dan J" <dan.j.williams@...el.com>
Cc:     "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "joe@...ches.com" <joe@...ches.com>,
        "nivedita@...m.mit.edu" <nivedita@...m.mit.edu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "arnd@...db.de" <arnd@...db.de>
Subject: Re: [PATCH 08/15] efi/x86: Move command-line initrd loading to
 efi_main

On Wed, May 27, 2020 at 10:30:18PM +0000, Williams, Dan J wrote:
> On Fri, 2020-05-08 at 20:01 +0200, Ard Biesheuvel wrote:
> > From: Arvind Sankar <nivedita@...m.mit.edu>
> > 
> > Consolidate the initrd loading in efi_main.
> > 
> > The command line options now need to be parsed only once.
> > 
> > Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
> > Link: 
> > https://lore.kernel.org/r/20200430182843.2510180-9-nivedita@alum.mit.edu
> > Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> 
> Hi,
> 
> This patch patch in tip/master as:
> 
> 987053a30016 efi/x86: Move command-line initrd loading to efi_main
> 
> ...regresses my nfs root configuration. It hangs trying to mount the
> nfs root filesystem "root=/dev/nfs ip=dhcp".
> 
> It does not revert cleanly.
> 
> 

Does this fix it?

diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index defeb6035109..f53362efef84 100644
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -771,10 +771,12 @@ unsigned long efi_main(efi_handle_t handle,
 			efi_err("Failed to load initrd!\n");
 			goto fail;
 		}
-		efi_set_u64_split(addr, &hdr->ramdisk_image,
-				  &boot_params->ext_ramdisk_image);
-		efi_set_u64_split(size, &hdr->ramdisk_size,
-				  &boot_params->ext_ramdisk_size);
+		if (size > 0) {
+			efi_set_u64_split(addr, &hdr->ramdisk_image,
+					  &boot_params->ext_ramdisk_image);
+			efi_set_u64_split(size, &hdr->ramdisk_size,
+					  &boot_params->ext_ramdisk_size);
+		}
 	}
 
 	/*