linux-kernel - [PATCH 3.19.y-ckt 153/251] of/address: use atomic allocation in pci_register_io

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Message-Id: <1437008972-9140-154-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:07:54 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Jingoo Han <jingoohan1@...il.com>, Rob Herring <robh@...nel.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 153/251] of/address: use atomic allocation in pci_register_io_range()

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jingoo Han <jingoohan1@...il.com>

commit 294240ffe784e951dc2ef070da04fa31ef6db3a0 upstream.

When kzalloc() is called under spin_lock(), GFP_ATOMIC should be
used to avoid sleeping allocation.
The call tree is:
  of_pci_range_to_resource()
    --> pci_register_io_range() <-- takes spin_lock(&io_range_lock);
       --> kzalloc()

Signed-off-by: Jingoo Han <jingoohan1@...il.com>
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/of/address.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 6906a3f..8bfda6a 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -712,7 +712,7 @@ int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
 	}
 
 	/* add the range to the list */
-	range = kzalloc(sizeof(*range), GFP_KERNEL);
+	range = kzalloc(sizeof(*range), GFP_ATOMIC);
 	if (!range) {
 		err = -ENOMEM;
 		goto end_register;
-- 
1.9.1

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