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  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]
Date:   Fri, 15 Mar 2019 13:07:59 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-gpio@...r.kernel.org, Lina Iyer <ilina@...eaurora.org>,
        Marc Zyngier <marc.zyngier@....com>
Subject: [PATCH] genirq: Respect IRQCHIP_SKIP_SET_WAKE in irq_chip_set_wake_parent()

This function returns an error if a child interrupt controller calls
irq_chip_set_wake_parent() but that parent interrupt controller has the
IRQCHIP_SKIP_SET_WAKE flag. Let's return 0 for success instead because
there isn't anything to do.

There's also the possibility that a parent indicates that we should skip
it, but the grandparent has an .irq_set_wake callback. Let's iterate
through the parent chain as long as the IRQCHIP_SKIP_SET_WAKE flag isn't
set so we can find the first parent that needs to handle the wake
configuration. This fixes a problem on my Qualcomm sdm845 device where
I'm trying to enable wake on an irq from the gpio controller that's a
child of the qcom pdc interrupt controller. The qcom pdc interrupt
controller has the IRQCHIP_SKIP_SET_WAKE flag set, and so does the
grandparent (ARM GIC), causing this function to return a failure because
the parent controller doesn't have the .irq_set_wake callback set.

Cc: Lina Iyer <ilina@...eaurora.org>
Cc: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 kernel/irq/chip.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 3faef4a77f71..280d612ba71b 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1448,7 +1448,13 @@ int irq_chip_set_vcpu_affinity_parent(struct irq_data *data, void *vcpu_info)
  */
 int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on)
 {
-	data = data->parent_data;
+	for (data = data->parent_data; data; data = data->parent_data)
+		if (!(data->chip->flags & IRQCHIP_SKIP_SET_WAKE))
+			break;
+
+	if (!data)
+		return 0;
+
 	if (data->chip->irq_set_wake)
 		return data->chip->irq_set_wake(data, on);
 
-- 
Sent by a computer through tubes

Powered by blists - more mailing lists