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Date: Sat, 25 May 2019 04:53:05 -0700 From: tip-bot for Rob Bradford <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: hpa@...or.com, linux-kernel@...r.kernel.org, blackgod016574@...il.com, peterz@...radead.org, mingo@...nel.org, ard.biesheuvel@...aro.org, torvalds@...ux-foundation.org, robert.bradford@...el.com, tglx@...utronix.de Subject: [tip:efi/urgent] efi: Allow the number of EFI configuration tables entries to be zero Commit-ID: 88447c5b93d98be847f428c39ba589779a59eb83 Gitweb: https://git.kernel.org/tip/88447c5b93d98be847f428c39ba589779a59eb83 Author: Rob Bradford <robert.bradford@...el.com> AuthorDate: Sat, 25 May 2019 13:25:59 +0200 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Sat, 25 May 2019 13:48:17 +0200 efi: Allow the number of EFI configuration tables entries to be zero Only try and access the EFI configuration tables if there there are any reported. This allows EFI to be continued to used on systems where there are no configuration table entries. Signed-off-by: Rob Bradford <robert.bradford@...el.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org> Cc: Gen Zhang <blackgod016574@...il.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: linux-efi@...r.kernel.org Link: http://lkml.kernel.org/r/20190525112559.7917-3-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@...nel.org> --- arch/x86/platform/efi/quirks.c | 3 +++ drivers/firmware/efi/efi.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c index feb77777c8b8..632b83885867 100644 --- a/arch/x86/platform/efi/quirks.c +++ b/arch/x86/platform/efi/quirks.c @@ -513,6 +513,9 @@ int __init efi_reuse_config(u64 tables, int nr_tables) void *p, *tablep; struct efi_setup_data *data; + if (nr_tables == 0) + return 0; + if (!efi_setup) return 0; diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 55b77c576c42..521a541d02ad 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -636,6 +636,9 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables) void *config_tables; int sz, ret; + if (efi.systab->nr_tables == 0) + return 0; + if (efi_enabled(EFI_64BIT)) sz = sizeof(efi_config_table_64_t); else
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