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usb: ehci: Move interrupt packet length check to create_int_queue

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Preperation patch to use create_int_queue outside of ehci-hcd.c .

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2014-09-24 14:06:04 +02:00 committed by Marek Vasut
parent 32f2eac1e0
commit bd818d81d8
1 changed files with 19 additions and 17 deletions
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36
drivers/usb/host/ehci-hcd.c
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@ -1154,6 +1154,23 @@ create_int_queue(struct usb_device *dev, unsigned long pipe, int queuesize,
struct int_queue *result = NULL;
int i;
/*
* Interrupt transfers requiring several transactions are not supported
* because bInterval is ignored.
*
* Also, ehci_submit_async() relies on wMaxPacketSize being a power of 2
* <= PKT_ALIGN if several qTDs are required, while the USB
* specification does not constrain this for interrupt transfers. That
* means that ehci_submit_async() would support interrupt transfers
* requiring several transactions only as long as the transfer size does
* not require more than a single qTD.
*/
if (elementsize > usb_maxpacket(dev, pipe)) {
printf("%s: xfers requiring several transactions are not supported.\n",
__func__);
return NULL;
}
debug("Enter create_int_queue\n");
if (usb_pipetype(pipe) != PIPE_INTERRUPT) {
debug("non-interrupt pipe (type=%lu)", usb_pipetype(pipe));
@ -1375,24 +1392,9 @@ submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
debug("dev=%p, pipe=%lu, buffer=%p, length=%d, interval=%d",
dev, pipe, buffer, length, interval);
/*
* Interrupt transfers requiring several transactions are not supported
* because bInterval is ignored.
*
* Also, ehci_submit_async() relies on wMaxPacketSize being a power of 2
* <= PKT_ALIGN if several qTDs are required, while the USB
* specification does not constrain this for interrupt transfers. That
* means that ehci_submit_async() would support interrupt transfers
* requiring several transactions only as long as the transfer size does
* not require more than a single qTD.
*/
if (length > usb_maxpacket(dev, pipe)) {
printf("%s: Interrupt transfers requiring several "
"transactions are not supported.\n", __func__);
return -1;
}
queue = create_int_queue(dev, pipe, 1, length, buffer);
if (!queue)
return -1;
timeout = get_timer(0) + USB_TIMEOUT_MS(pipe);
while ((backbuffer = poll_int_queue(dev, queue)) == NULL)