linux-kernel - [PATCH] ACPI: Use fwnode

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Date:   Fri, 11 Dec 2020 12:26:29 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     Qian Cai <qcai@...hat.com>, Robin Murphy <robin.murphy@....com>,
        Marc Zyngier <maz@...nel.org>, kernel-team@...roid.com,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ACPI: Use fwnode_init() to set up fwnode

Commit 01bb86b380a3 ("driver core: Add fwnode_init()") was supposed to
fix up all instances of fwnode creation to use fwnode_init(). But looks
like this instance was missed. This causes a NULL pointer dereference
during device_add() [1]. So, fix it.

[   60.792324][    T1] Call trace:
[   60.795495][    T1]  device_add+0xf60/0x16b0
__fw_devlink_link_to_consumers at drivers/base/core.c:1583
(inlined by) fw_devlink_link_device at drivers/base/core.c:1726
(inlined by) device_add at drivers/base/core.c:3088
[   60.799813][    T1]  platform_device_add+0x274/0x628
[   60.804833][    T1]  acpi_iort_init+0x9d8/0xc50
[   60.809415][    T1]  acpi_init+0x45c/0x4e8
[   60.813556][    T1]  do_one_initcall+0x170/0xb70
[   60.818224][    T1]  kernel_init_freeable+0x6a8/0x734
[   60.823332][    T1]  kernel_init+0x18/0x12c
[   60.827566][    T1]  ret_from_fork+0x10/0x1c
[   60.838756][    T1] ---[ end trace fa5c8ce17a226d83 ]---

[1] - https://lore.kernel.org/linux-arm-kernel/02e7047071f0b54b046ac472adeeb3fafabc643c.camel@redhat.com/
Fixes: 01bb86b380a3 ("driver core: Add fwnode_init()")
Reported-by: Qian Cai <qcai@...hat.com>
Suggested-by: Robin Murphy <robin.murphy@....com>
Tested-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Saravana Kannan <saravanak@...gle.com>
---
Greg,

Can you please pull this into driver-core-next since the commit that
causes this is only present in driver-core-next?

-Saravana

 include/linux/acpi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 39263c6b52e1..2630c2e953f7 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -55,7 +55,7 @@ static inline struct fwnode_handle *acpi_alloc_fwnode_static(void)
 	if (!fwnode)
 		return NULL;
 
-	fwnode->ops = &acpi_static_fwnode_ops;
+	fwnode_init(fwnode, &acpi_static_fwnode_ops);
 
 	return fwnode;
 }
-- 
2.29.2.576.ga3fc446d84-goog