[PATCH] platform/x86: panasonic-laptop: simplify allocation of sinf

[Rosen Penev <rosenp@gmail.com>]

Change to a flexible array member to allocate once instead of twice.

Allows using __counted_by for extra runtime analysis. Move the counting
variable assignment to right after allocation as required by
__counted_by.

Remove + 1 to allocation. It's already done in the previous line.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/platform/x86/panasonic-laptop.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
index d923ddaa4849..4d663fffbcc8 100644
--- a/drivers/platform/x86/panasonic-laptop.c
+++ b/drivers/platform/x86/panasonic-laptop.c
@@ -248,11 +248,11 @@ struct pcc_acpi {
 	int			ac_brightness;
 	int			dc_brightness;
 	int			current_brightness;
-	u32			*sinf;
 	struct acpi_device	*device;
 	struct input_dev	*input_dev;
 	struct backlight_device	*backlight;
 	struct platform_device	*platform;
+	u32			sinf[] __counted_by(num_sifr);
 };
 
 /*
@@ -1017,21 +1017,15 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
 	 */
 	num_sifr++;
 
-	pcc = kzalloc_obj(struct pcc_acpi);
+	pcc = kzalloc_flex(*pcc, sinf, num_sifr);
 	if (!pcc) {
 		pr_err("Couldn't allocate mem for pcc");
 		return -ENOMEM;
 	}
 
-	pcc->sinf = kcalloc(num_sifr + 1, sizeof(u32), GFP_KERNEL);
-	if (!pcc->sinf) {
-		result = -ENOMEM;
-		goto out_hotkey;
-	}
-
+	pcc->num_sifr = num_sifr;
 	pcc->device = device;
 	pcc->handle = device->handle;
-	pcc->num_sifr = num_sifr;
 	device->driver_data = pcc;
 	strscpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
 	strscpy(acpi_device_class(device), ACPI_PCC_CLASS);
@@ -1039,7 +1033,7 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
 	result = acpi_pcc_init_input(pcc);
 	if (result) {
 		pr_err("Error installing keyinput handler\n");
-		goto out_sinf;
+		goto out_hotkey;
 	}
 
 	if (!acpi_pcc_retrieve_biosdata(pcc)) {
@@ -1111,8 +1105,6 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
 	backlight_device_unregister(pcc->backlight);
 out_input:
 	input_unregister_device(pcc->input_dev);
-out_sinf:
-	kfree(pcc->sinf);
 out_hotkey:
 	kfree(pcc);
 
@@ -1140,7 +1132,6 @@ static void acpi_pcc_hotkey_remove(struct acpi_device *device)
 
 	input_unregister_device(pcc->input_dev);
 
-	kfree(pcc->sinf);
 	kfree(pcc);
 }
 
-- 
2.53.0