[PATCH] Realtek cr: Fix driver freeze issue

[edwin_rong]

From: edwin_rong <edwin_rong@xxxxxxxxxxxxxx>

After auto-delink command is triggered, the CSW won't be sent back
to host side, in which scenario, the USB Mass Storage driver will
wait for the completion of the URB for MAX_SCHEDULE_TIMEOUT.

Signed-off-by: edwin_rong <edwin_rong@xxxxxxxxxxxxxx>
---
 drivers/usb/storage/realtek_cr.c |   81 ++++++++++++++++++++++++++++++++++++--
 1 files changed, 77 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/storage/realtek_cr.c b/drivers/usb/storage/realtek_cr.c
index 34adc4b..0061bfc 100644
--- a/drivers/usb/storage/realtek_cr.c
+++ b/drivers/usb/storage/realtek_cr.c
@@ -293,6 +293,52 @@ static int rts51x_bulk_transport(struct us_data *us, u8 lun,
 	return USB_STOR_TRANSPORT_ERROR;
 }
 
+static int rts51x_bulk_transport_special(struct us_data *us, u8 lun,
+				 u8 *cmd, int cmd_len, u8 *buf, int buf_len,
+				 enum dma_data_direction dir, int *act_len)
+{
+	struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
+	struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf;
+	int result;
+	unsigned int cswlen;
+	unsigned int cbwlen = US_BULK_CB_WRAP_LEN;
+
+	/* set up the command wrapper */
+	bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
+	bcb->DataTransferLength = cpu_to_le32(buf_len);
+	bcb->Flags = (dir == DMA_FROM_DEVICE) ? 1 << 7 : 0;
+	bcb->Tag = ++us->tag;
+	bcb->Lun = lun;
+	bcb->Length = cmd_len;
+
+	/* copy the command payload */
+	memset(bcb->CDB, 0, sizeof(bcb->CDB));
+	memcpy(bcb->CDB, cmd, bcb->Length);
+
+	/* send it to out endpoint */
+	result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
+				bcb, cbwlen, NULL);
+	if (result != USB_STOR_XFER_GOOD)
+		return USB_STOR_TRANSPORT_ERROR;
+
+	/* DATA STAGE */
+	/* send/receive data payload, if there is any */
+
+	if (buf && buf_len) {
+		unsigned int pipe = (dir == DMA_FROM_DEVICE) ?
+				us->recv_bulk_pipe : us->send_bulk_pipe;
+		result = usb_stor_bulk_transfer_buf(us, pipe,
+				buf, buf_len, NULL);
+		if (result == USB_STOR_XFER_ERROR)
+			return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* get CSW for device status */
+	result = usb_bulk_msg(us->pusb_dev, us->recv_bulk_pipe, bcs,
+			US_BULK_CS_WRAP_LEN, &cswlen, 250);
+	return result;
+}
+
 /* Determine what the maximum LUN supported is */
 static int rts51x_get_max_lun(struct us_data *us)
 {
@@ -434,6 +480,29 @@ static int enable_oscillator(struct us_data *us)
 	return 0;
 }
 
+static int __do_config_autodelink(struct us_data *us, u8 *data, u16 len)
+{
+	int retval;
+	u16 addr = 0xFE47;
+	u8 cmnd[12] = {0};
+
+	US_DEBUGP("%s, addr = 0x%x, len = %d\n", __FUNCTION__, addr, len);
+
+	cmnd[0] = 0xF0;
+	cmnd[1] = 0x0E;
+	cmnd[2] = (u8)(addr >> 8);
+	cmnd[3] = (u8)addr;
+	cmnd[4] = (u8)(len >> 8);
+	cmnd[5] = (u8)len;
+
+	retval = rts51x_bulk_transport_special(us, 0, cmnd, 12, data, len, DMA_TO_DEVICE, NULL);
+	if (retval != USB_STOR_TRANSPORT_GOOD) {
+		return -EIO;
+	}
+
+	return 0;
+}
+
 static int do_config_autodelink(struct us_data *us, int enable, int force)
 {
 	int retval;
@@ -454,7 +523,8 @@ static int do_config_autodelink(struct us_data *us, int enable, int force)
 
 	US_DEBUGP("In %s,set 0xfe47 to 0x%x\n", __func__, value);
 
-	retval = rts51x_write_mem(us, 0xFE47, &value, 1);
+	/* retval = rts51x_write_mem(us, 0xFE47, &value, 1); */
+	retval = __do_config_autodelink(us, &value, 1);
 	if (retval < 0)
 		return -EIO;
 
@@ -486,7 +556,8 @@ static int config_autodelink_after_power_on(struct us_data *us)
 
 		SET_BIT(value, 7);
 
-		retval = rts51x_write_mem(us, 0xFE47, &value, 1);
+		/* retval = rts51x_write_mem(us, 0xFE47, &value, 1); */
+		retval = __do_config_autodelink(us, &value, 1);
 		if (retval < 0)
 			return -EIO;
 
@@ -507,7 +578,8 @@ static int config_autodelink_after_power_on(struct us_data *us)
 			CLR_BIT(value, 7);
 		}
 
-		retval = rts51x_write_mem(us, 0xFE47, &value, 1);
+		/* retval = rts51x_write_mem(us, 0xFE47, &value, 1); */
+		retval = __do_config_autodelink(us, &value, 1);
 		if (retval < 0)
 			return -EIO;
 
@@ -584,7 +656,8 @@ static int config_autodelink_before_power_down(struct us_data *us)
 			if (CHECK_ID(chip, 0x0138, 0x3882))
 				SET_BIT(value, 2);
 
-			retval = rts51x_write_mem(us, 0xFE47, &value, 1);
+			/* retval = rts51x_write_mem(us, 0xFE47, &value, 1); */
+			retval = __do_config_autodelink(us, &value, 1);
 			if (retval < 0)
 				return -EIO;
 		}
-- 
1.7.4.1

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