linux-kernel - Please revert 7212e37cbdf9 from 4.4-stable

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Date:   Mon, 11 Mar 2019 13:48:14 +0000
From:   Hedi Berriche <hedi.berriche@....com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Hedi Berriche <hedi.berriche@....com>,
        Borislav Petkov <bp@...e.de>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Russ Anderson <rja@....com>,
        Dimitri Sivanich <sivanich@....com>,
        Steve Wahl <steve.wahl@....com>,
        Mike Travis <mike.travis@....com>,
        Andy Shevchenko <andy@...radead.org>,
        Bhupesh Sharma <bhsharma@...hat.com>,
        Darren Hart <dvhart@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        linux-efi <linux-efi@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>, x86-ml <x86@...nel.org>
Subject: Please revert 7212e37cbdf9 from 4.4-stable

Hi Greg,

Could you please revert

	7212e37cbdf9 x86/platform/UV: Use efi_runtime_lock to serialise BIOS calls

from 4.4-stable?

In 4.4-stable efi_runtime_lock as defined in drivers/firmware/efi/runtime-wrappers.c
is a spinlock (given it predates commit dce48e351c0d) and commit

	f331e766c4be x86/platform/UV: Use efi_runtime_lock to serialise BIOS calls

which 7212e37cbdf9 is a backport of, needs it to be a semaphore.

Cheers,
Hedi.
-- 
Be careful of reading health books, you might die of a misprint.
	-- Mark Twain