linux-kernel - [PATCH 1/2] clk: bcm2835: Mark the VPU clock as critical

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1461699585-6649-1-git-send-email-eric@anholt.net>
Date:	Tue, 26 Apr 2016 12:39:44 -0700
From:	Eric Anholt <eric@...olt.net>
To:	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	Lee Jones <lee@...nel.org>,
	Martin Sperl <kernel@...tin.sperl.org>,
	Eric Anholt <eric@...olt.net>
Subject: [PATCH 1/2] clk: bcm2835: Mark the VPU clock as critical

The VPU clock is also the clock for our AXI bus, so we really can't
disable it.  This might have happened during boot if, for example,
uart1 (aux_uart clock) probed and was then disabled before the other
consumers of the VPU clock had probed.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 drivers/clk/bcm/clk-bcm2835.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index 5a7e3eca5d12..14f3066194ac 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -1267,6 +1267,7 @@ static struct clk *bcm2835_register_clock(struct bcm2835_cprman *cprman,
 
 	if (data->is_vpu_clock) {
 		init.ops = &bcm2835_vpu_clock_clk_ops;
+		init.flags |= CLK_IS_CRITICAL;
 	} else {
 		init.ops = &bcm2835_clock_clk_ops;
 		init.flags |= CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
-- 
2.8.0.rc3