linux-kernel - [PATCH] staging: r888eu: use dynamic allocation for efuse buffer

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Date:   Wed, 13 Jul 2022 09:58:04 +0200
From:   Martin Kaiser <martin@...ser.cx>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Michael Straube <straube.linux@...il.com>,
        Pavel Skripkin <paskripkin@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Martin Kaiser <martin@...ser.cx>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] staging: r888eu: use dynamic allocation for efuse buffer

Use kmalloc to allocate the efuse buffer in ReadAdapterInfo8188EU and
free it on exit. This is better than using a 512 byte array on the stack.

It's ok to drop the __aligned(4) qualifier. kmalloc aligns to
ARCH_KMALLOC_MINALIGN, this is at least 8 bytes.

Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
Suggested-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: Martin Kaiser <martin@...ser.cx>
---
 drivers/staging/r8188eu/hal/usb_halinit.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/r8188eu/hal/usb_halinit.c b/drivers/staging/r8188eu/hal/usb_halinit.c
index 8902dda7b8d8..421fe7c40390 100644
--- a/drivers/staging/r8188eu/hal/usb_halinit.c
+++ b/drivers/staging/r8188eu/hal/usb_halinit.c
@@ -926,7 +926,7 @@ void ReadAdapterInfo8188EU(struct adapter *Adapter)
 {
 	struct eeprom_priv *eeprom = &Adapter->eeprompriv;
 	struct led_priv *ledpriv = &Adapter->ledpriv;
-	u8 efuse_buf[EFUSE_MAP_LEN_88E] __aligned(4);
+	u8 *efuse_buf;
 	u8 eeValue;
 	int res;
 
@@ -937,7 +937,10 @@ void ReadAdapterInfo8188EU(struct adapter *Adapter)
 
 	eeprom->bautoload_fail_flag	= !(eeValue & EEPROM_EN);
 
-	memset(efuse_buf, 0xFF, sizeof(efuse_buf));
+	efuse_buf = kmalloc(EFUSE_MAP_LEN_88E, GFP_KERNEL);
+	if (!efuse_buf)
+		return;
+	memset(efuse_buf, 0xFF, EFUSE_MAP_LEN_88E);
 
 	if (!(eeValue & BOOT_FROM_EEPROM) && !eeprom->bautoload_fail_flag) {
 		rtl8188e_EfusePowerSwitch(Adapter, true);
@@ -957,6 +960,7 @@ void ReadAdapterInfo8188EU(struct adapter *Adapter)
 	Hal_ReadThermalMeter_88E(Adapter, efuse_buf, eeprom->bautoload_fail_flag);
 
 	ledpriv->bRegUseLed = true;
+	kfree(efuse_buf);
 }
 
 static void ResumeTxBeacon(struct adapter *adapt)
-- 
2.30.2