From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Heiko Carstens , Martin Schwidefsky Subject: [PATCH 3.18 123/145] s390: make setup_randomness work Date: Sun, 16 Apr 2017 12:50:16 +0200 Message-Id: <20170416080207.191962311@linuxfoundation.org> In-Reply-To: <20170416080200.205458595@linuxfoundation.org> References: <20170416080200.205458595@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Heiko Carstens commit da8fd820f389a0e29080b14c61bf5cf1d8ef5ca1 upstream. Commit bcfcbb6bae64 ("s390: add system information as device randomness") intended to add some virtual machine specific information to the randomness pool. Unfortunately it uses the page allocator before it is ready to use. In result the page allocator always returns NULL and the setup_randomness function never adds anything to the randomness pool. To fix this use memblock_alloc and memblock_free instead. Fixes: bcfcbb6bae64 ("s390: add system information as device randomness") Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/kernel/setup.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -822,10 +822,10 @@ static void __init setup_randomness(void { struct sysinfo_3_2_2 *vmms; - vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL); - if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count) + vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) add_device_randomness(&vmms, vmms->count); - free_page((unsigned long) vmms); + memblock_free((unsigned long) vmms, PAGE_SIZE); } /*