[PATCH v9 15/16] staging: r8188eu: remove shared buffer for USB requests

From: Fabio M. De Francesco
Date: Tue Sep 21 2021 - 14:20:01 EST


From: Pavel Skripkin <paskripkin@xxxxxxxxx>

Remove the shared buffer for USB requests because it is not necessary
and use a local on stack variable since the new Core USB API does not
have the constraints of usb_control_msg().

Co-developed-by: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx>
Signed-off-by: Pavel Skripkin <paskripkin@xxxxxxxxx>
---
drivers/staging/r8188eu/hal/usb_ops_linux.c | 15 ++++++---------
drivers/staging/r8188eu/include/drv_types.h | 3 ---
drivers/staging/r8188eu/os_dep/usb_intf.c | 14 +-------------
3 files changed, 7 insertions(+), 25 deletions(-)

diff --git a/drivers/staging/r8188eu/hal/usb_ops_linux.c b/drivers/staging/r8188eu/hal/usb_ops_linux.c
index 88db7488b3a2..3ede93cd68d6 100644
--- a/drivers/staging/r8188eu/hal/usb_ops_linux.c
+++ b/drivers/staging/r8188eu/hal/usb_ops_linux.c
@@ -14,7 +14,7 @@ static int usb_read(struct intf_hdl *intf, u16 value, void *data, u8 size)
struct dvobj_priv *dvobjpriv = adapter_to_dvobj(adapt);
struct usb_device *udev = dvobjpriv->pusbdev;
int status;
- u8 *io_buf; /* Pointer to I/O buffer */
+ u8 io_buf[4];

mutex_lock(&dvobjpriv->usb_vendor_req_mutex);

@@ -23,9 +23,6 @@ static int usb_read(struct intf_hdl *intf, u16 value, void *data, u8 size)
goto mutex_unlock;
}

- /* Acquire IO memory for vendorreq */
- io_buf = dvobjpriv->usb_vendor_req_buf;
-
status = usb_control_msg_recv(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
REALTEK_USB_VENQT_READ, value,
REALTEK_USB_VENQT_CMD_IDX, io_buf,
@@ -70,14 +67,14 @@ static int usb_write(struct intf_hdl *intf, u16 value, void *data, u8 size)
struct dvobj_priv *dvobjpriv = adapter_to_dvobj(adapt);
struct usb_device *udev = dvobjpriv->pusbdev;
int status;
- u8 *io_buf; /* Pointer to I/O buffer */
+ u8 io_buf[VENDOR_CMD_MAX_DATA_LEN];

mutex_lock(&dvobjpriv->usb_vendor_req_mutex);

- if (adapt->bSurpriseRemoved || adapt->pwrctrlpriv.pnp_bstop_trx)
- return -EPERM;
-
- io_buf = dvobjpriv->usb_vendor_req_buf;
+ if (adapt->bSurpriseRemoved || adapt->pwrctrlpriv.pnp_bstop_trx) {
+ status = -EPERM;
+ goto mutex_unlock;
+ }

memcpy(io_buf, data, size);
status = usb_control_msg_send(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
diff --git a/drivers/staging/r8188eu/include/drv_types.h b/drivers/staging/r8188eu/include/drv_types.h
index c96a33c8c621..6d63429d06c6 100644
--- a/drivers/staging/r8188eu/include/drv_types.h
+++ b/drivers/staging/r8188eu/include/drv_types.h
@@ -168,9 +168,6 @@ struct dvobj_priv {
struct semaphore usb_suspend_sema;
struct mutex usb_vendor_req_mutex;

- u8 *usb_alloc_vendor_req_buf;
- u8 *usb_vendor_req_buf;
-
struct usb_interface *pusbintf;
struct usb_device *pusbdev;

diff --git a/drivers/staging/r8188eu/os_dep/usb_intf.c b/drivers/staging/r8188eu/os_dep/usb_intf.c
index 11a584cbe9d8..5ab42d55207f 100644
--- a/drivers/staging/r8188eu/os_dep/usb_intf.c
+++ b/drivers/staging/r8188eu/os_dep/usb_intf.c
@@ -75,24 +75,12 @@ static struct rtw_usb_drv *usb_drv = &rtl8188e_usb_drv;

static u8 rtw_init_intf_priv(struct dvobj_priv *dvobj)
{
- u8 rst = _SUCCESS;
-
mutex_init(&dvobj->usb_vendor_req_mutex);
-
- dvobj->usb_alloc_vendor_req_buf = kzalloc(MAX_USB_IO_CTL_SIZE, GFP_KERNEL);
- if (!dvobj->usb_alloc_vendor_req_buf) {
- DBG_88E("alloc usb_vendor_req_buf failed... /n");
- rst = _FAIL;
- goto exit;
- }
- dvobj->usb_vendor_req_buf = (u8 *)N_BYTE_ALIGMENT((size_t)(dvobj->usb_alloc_vendor_req_buf), ALIGNMENT_UNIT);
-exit:
- return rst;
+ return _SUCCESS;
}

static void rtw_deinit_intf_priv(struct dvobj_priv *dvobj)
{
- kfree(dvobj->usb_alloc_vendor_req_buf);
mutex_destroy(&dvobj->usb_vendor_req_mutex);
}

--
2.33.0