add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/usb/usb-skeleton.c
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@@ -35,9 +35,11 @@
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 /* our private defines. if this grows any larger, use your own .h file */
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 #define MAX_TRANSFER		(PAGE_SIZE - 512)
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-/* MAX_TRANSFER is chosen so that the VM is not stressed by
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-   allocations > PAGE_SIZE and the number of packets in a page
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-   is an integer 512 is the largest possible packet on EHCI */
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+/*
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+ * MAX_TRANSFER is chosen so that the VM is not stressed by
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+ * allocations > PAGE_SIZE and the number of packets in a page
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+ * is an integer 512 is the largest possible packet on EHCI
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+ */
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 #define WRITES_IN_FLIGHT	8
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 /* arbitrarily chosen */
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@@ -228,8 +230,7 @@
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 	dev = file->private_data;
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-	/* if we cannot read at all, return EOF */
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-	if (!dev->bulk_in_urb || !count)
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+	if (!count)
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 		return 0;
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 	/* no concurrent readers */
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@@ -573,6 +574,7 @@
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 	dev->disconnected = 1;
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 	mutex_unlock(&dev->io_mutex);
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+	usb_kill_urb(dev->bulk_in_urb);
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 	usb_kill_anchored_urbs(&dev->submitted);
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 	/* decrement our usage count */