Thread (31 messages) 31 messages, 4 authors, 2021-09-14

Re: [PATCH v4 17/18] staging: r8188eu: Shorten calls chain of rtw_read8/16/32()

From: Dan Carpenter <hidden>
Date: 2021-09-14 09:33:32
Also in: lkml

On Mon, Sep 13, 2021 at 08:10:01PM +0200, Fabio M. De Francesco wrote:
quoted hunk ↗ jump to hunk
diff --git a/drivers/staging/r8188eu/hal/usb_ops_linux.c b/drivers/staging/r8188eu/hal/usb_ops_linux.c
index 04402bab805e..75475b0083db 100644
--- a/drivers/staging/r8188eu/hal/usb_ops_linux.c
+++ b/drivers/staging/r8188eu/hal/usb_ops_linux.c
@@ -89,6 +89,56 @@ static int usbctrl_vendorreq(struct intf_hdl *intfhdl, u16 value, void *data, u1
 	return status;
 }
 
+static int usb_read(struct intf_hdl *intfhdl, u16 addr, void *data, u8 size)
+{
+	int status;
+	u8 *io_buf; /* pointer to I/O buffer */
+	struct adapter *adapt = intfhdl->padapter;
+	struct dvobj_priv *dvobjpriv = adapter_to_dvobj(adapt);
+	struct usb_device *udev = dvobjpriv->pusbdev;
+
+	if (adapt->bSurpriseRemoved || adapt->pwrctrlpriv.pnp_bstop_trx) {
+		status = -EPERM;
+		goto exit;
+	}
Just return directly.

	if (adapt->bSurpriseRemoved || adapt->pwrctrlpriv.pnp_bstop_trx)
		return -EPERM;
+
+	mutex_lock(&dvobjpriv->usb_vendor_req_mutex);
+
+	io_buf = dvobjpriv->usb_vendor_req_buf;
+
+	status = usb_control_msg_recv(udev, 0, REALTEK_USB_VENQT_CMD_REQ,
+				      REALTEK_USB_VENQT_READ, addr,
+				      REALTEK_USB_VENQT_CMD_IDX, io_buf,
+				      size, RTW_USB_CONTROL_MSG_TIMEOUT,
+				      GFP_KERNEL);
+	if (!status) {
+		/*  Success this control transfer. */
It's always better to do error handling instead of success handling.

	if (status) {

Remove the comment because now it's in the standard format.
+		rtw_reset_continual_urb_error(dvobjpriv);
+		memcpy(data, io_buf, size);
+		goto mutex_unlock;
+	}
+	/*  error cases */
+	if (status == (-ESHUTDOWN || -ENODEV || -ENOENT)) {
	if (status == -ESHUTDOWN ||
	    status == -ENODEV ||
	    status == -ENOENT) {

+		/*
+		 * device or controller has been disabled due to
+		 * some problem that could not be worked around,
+		 * device or bus doesn’t exist, endpoint does not
+		 * exist or is not enabled.
+		 */
+		adapt->bSurpriseRemoved = true;
+			goto mutex_unlock;
Indented wrong.
+	}
+	GET_HAL_DATA(adapt)->srestpriv.wifi_error_status = USB_VEN_REQ_CMD_FAIL;
+	if (rtw_inc_and_chk_continual_urb_error(dvobjpriv)) {
+		adapt->bSurpriseRemoved = true;
+		goto mutex_unlock;
+	}
+mutex_unlock:
+	mutex_unlock(&dvobjpriv->usb_vendor_req_mutex);
+exit:
+	return status;
+}
regards,
dan carpenter
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