add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/usb/misc/adutux.c
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@@ -109,7 +109,7 @@
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 		function, size, size, data);
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 }
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-/**
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+/*
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  * adu_abort_transfers
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  *      aborts transfers and frees associated data structures
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  */
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@@ -346,7 +346,6 @@
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 	struct adu_device *dev;
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 	size_t bytes_read = 0;
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 	size_t bytes_to_read = count;
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-	int i;
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 	int retval = 0;
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 	int timeout = 0;
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 	int should_submit = 0;
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@@ -374,23 +373,22 @@
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 	timeout = COMMAND_TIMEOUT;
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 	dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__);
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 	while (bytes_to_read) {
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-		int data_in_secondary = dev->secondary_tail - dev->secondary_head;
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+		size_t data_in_secondary = dev->secondary_tail - dev->secondary_head;
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 		dev_dbg(&dev->udev->dev,
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-			"%s : while, data_in_secondary=%d, status=%d\n",
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+			"%s : while, data_in_secondary=%zu, status=%d\n",
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 			__func__, data_in_secondary,
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 			dev->interrupt_in_urb->status);
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 		if (data_in_secondary) {
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 			/* drain secondary buffer */
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-			int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
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-			i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
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-			if (i) {
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+			size_t amount = min(bytes_to_read, data_in_secondary);
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+			if (copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount)) {
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 				retval = -EFAULT;
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 				goto exit;
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 			}
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-			dev->secondary_head += (amount - i);
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-			bytes_read += (amount - i);
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-			bytes_to_read -= (amount - i);
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+			dev->secondary_head += amount;
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+			bytes_read += amount;
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+			bytes_to_read -= amount;
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 		} else {
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 			/* we check the primary buffer */
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 			spin_lock_irqsave (&dev->buflock, flags);
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@@ -645,7 +643,7 @@
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 	.minor_base = ADU_MINOR_BASE,
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 };
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-/**
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+/*
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  * adu_probe
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  *
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  * Called by the usb core when a new device is connected that it thinks
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@@ -756,7 +754,7 @@
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 	return retval;
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 }
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-/**
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+/*
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  * adu_disconnect
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  *
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  * Called by the usb core when the device is removed from the system.