linux-kernel - Re: [PATCH V2] mfd: abx500-core: Fix compiler warning larger stack frame

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Date:	Wed, 21 May 2014 11:45:25 +0530
From:	Jay Aurabind <mail@...abindo.in>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kbuild test robot <fengguang.wu@...el.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH V2] mfd: abx500-core: Fix compiler warning larger stack
 frame

H1,

Change from V1 -> V2: Fix a potential null pointer dereference as reported by kbuild test robot <fengguang.wu@...el.com>.

Inorder to report the kzalloc failure, I have just used a pr_debug statement. If it looks ugly, should I change the function's return value to int and give out an -ENOMEM ?

From 6615c7a995a6bb4dcf4c1e9ac59bca823ec821a5 Mon Sep 17 00:00:00 2001
From: Aurabindo J <mail@...abindo.in>
Date: Wed, 21 May 2014 11:18:10 +0530
Subject: [PATCH] mfd: abx500-core: Fix compiler warning larger stack frame

On systems with CONFIG_FRAME_WARN=1024, compiler warns the allocation of
an object of struct device on stack. Make the allocation dynamically to
fix the warning.

Signed-off-by: Aurabindo J <mail@...abindo.in>
---
 drivers/mfd/abx500-core.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/mfd/abx500-core.c b/drivers/mfd/abx500-core.c
index f3a15aa..5e5098d 100644
--- a/drivers/mfd/abx500-core.c
+++ b/drivers/mfd/abx500-core.c
@@ -154,16 +154,21 @@ EXPORT_SYMBOL(abx500_startup_irq_enabled);
 void abx500_dump_all_banks(void)
 {
 	struct abx500_ops *ops;
-	struct device dummy_child = {NULL};
+	struct device *dummy_child;
 	struct abx500_device_entry *dev_entry;
 
-	list_for_each_entry(dev_entry, &abx500_list, list) {
-		dummy_child.parent = dev_entry->dev;
-		ops = &dev_entry->ops;
+	dummy_child = kzalloc(sizeof(struct device), GFP_KERNEL);
+	if (dummy_child != NULL) {
+		list_for_each_entry(dev_entry, &abx500_list, list) {
+			dummy_child->parent = dev_entry->dev;
+			ops = &dev_entry->ops;
 
-		if ((ops != NULL) && (ops->dump_all_banks != NULL))
-			ops->dump_all_banks(&dummy_child);
-	}
+			if ((ops != NULL) && (ops->dump_all_banks != NULL))
+				ops->dump_all_banks(dummy_child);
+		}
+		kfree(dummy_child);
+	} else
+		pr_debug("kzalloc failure in abx500_dump_all_banks\n");
 }
 EXPORT_SYMBOL(abx500_dump_all_banks);
 
-- 
1.9.1




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