linux-kernel - [PATCH 6/8] mtd: maps: gpio-addr-flash: Split allocation in two

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Date:   Tue, 21 Aug 2018 16:31:50 +0200
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Zhouyang Jia <jiazhouyang09@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH 6/8] mtd: maps: gpio-addr-flash: Split allocation in two

Instead of making one allocation and then calculating the addresses of
those two pointers in that area make two allocations. This simplifies
the code.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
 drivers/mtd/maps/gpio-addr-flash.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/maps/gpio-addr-flash.c b/drivers/mtd/maps/gpio-addr-flash.c
index 8f5e3dce9be3..9455a8448064 100644
--- a/drivers/mtd/maps/gpio-addr-flash.c
+++ b/drivers/mtd/maps/gpio-addr-flash.c
@@ -205,7 +205,7 @@ static const char * const part_probe_types[] = {
  */
 static int gpio_flash_probe(struct platform_device *pdev)
 {
-	size_t i, arr_size;
+	size_t i;
 	struct physmap_flash_data *pdata;
 	struct resource *memory;
 	struct resource *gpios;
@@ -218,8 +218,7 @@ static int gpio_flash_probe(struct platform_device *pdev)
 	if (!memory || !gpios || !gpios->end)
 		return -EINVAL;
 
-	arr_size = sizeof(state->gpio_addrs[0]) * gpios->end;
-	state = devm_kzalloc(&pdev->dev, sizeof(*state) + arr_size, GFP_KERNEL);
+	state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
 	if (!state)
 		return -ENOMEM;
 
@@ -228,7 +227,12 @@ static int gpio_flash_probe(struct platform_device *pdev)
 	 * away their pointer types here to the known types (gpios->xxx).
 	 */
 	state->gpio_count     = gpios->end;
-	state->gpio_addrs     = (void *)(unsigned long)gpios->start;
+	state->gpio_addrs     = devm_kzalloc(&pdev->dev,
+					     sizeof(state->gpio_addrs[0]) *
+								gpios->end,
+					     GFP_KERNEL);
+	if (!state->gpio_addrs)
+		return -ENOMEM;
 	state->win_order      = get_bitmask_order(resource_size(memory)) - 1;
 
 	state->map.name       = DRIVER_NAME;
-- 
2.18.0