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authorHans de Goede <hdegoede@redhat.com>2014-09-24 14:06:04 +0200
committerMarek Vasut <marex@denx.de>2014-11-04 06:04:00 +0100
commitbd818d81d89ff99c7fc90eb1d04d26d2e363d670 (patch)
tree05bc20ede56fc44a4db5aa46807b53920c7f61fb
parent32f2eac1e02c55bd0e948b28dd3bda5950f56f57 (diff)
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usb: ehci: Move interrupt packet length check to create_int_queue
Preperation patch to use create_int_queue outside of ehci-hcd.c . Signed-off-by: Hans de Goede <hdegoede@redhat.com>
-rw-r--r--drivers/usb/host/ehci-hcd.c36
1 files changed, 19 insertions, 17 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 55f4436..0ffd6f1 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -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)