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path: root/drivers/usb/host/ehci-q.c
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Diffstat (limited to 'drivers/usb/host/ehci-q.c')
-rw-r--r--drivers/usb/host/ehci-q.c34
1 files changed, 16 insertions, 18 deletions
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 64942ec584c..315c7c14aaa 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -242,7 +242,8 @@ __acquires(ehci->lock)
if (unlikely(urb->unlinked)) {
COUNT(ehci->stats.unlink);
} else {
- if (likely(status == -EINPROGRESS))
+ /* report non-error and short read status as zero */
+ if (status == -EINPROGRESS || status == -EREMOTEIO)
status = 0;
COUNT(ehci->stats.complete);
}
@@ -283,7 +284,6 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
int last_status = -EINPROGRESS;
int stopped;
unsigned count = 0;
- int do_status = 0;
u8 state;
u32 halt = HALT_BIT(ehci);
@@ -309,7 +309,6 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
struct ehci_qtd *qtd;
struct urb *urb;
u32 token = 0;
- int qtd_status;
qtd = list_entry (entry, struct ehci_qtd, qtd_list);
urb = qtd->urb;
@@ -377,13 +376,6 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
else if (last_status == -EINPROGRESS && !urb->unlinked)
continue;
- /* issue status after short control reads */
- if (unlikely (do_status != 0)
- && QTD_PID (token) == 0 /* OUT */) {
- do_status = 0;
- continue;
- }
-
/* qh unlinked; token in overlay may be most current */
if (state == QH_STATE_IDLE
&& cpu_to_hc32(ehci, qtd->qtd_dma)
@@ -401,15 +393,21 @@ halt:
}
}
- /* remove it from the queue */
- qtd_status = qtd_copy_status(ehci, urb, qtd->length, token);
- if (unlikely(qtd_status == -EREMOTEIO)) {
- do_status = (!urb->unlinked &&
- usb_pipecontrol(urb->pipe));
- qtd_status = 0;
+ /* unless we already know the urb's status, collect qtd status
+ * and update count of bytes transferred. in common short read
+ * cases with only one data qtd (including control transfers),
+ * queue processing won't halt. but with two or more qtds (for
+ * example, with a 32 KB transfer), when the first qtd gets a
+ * short read the second must be removed by hand.
+ */
+ if (last_status == -EINPROGRESS) {
+ last_status = qtd_copy_status(ehci, urb,
+ qtd->length, token);
+ if (last_status == -EREMOTEIO
+ && (qtd->hw_alt_next
+ & EHCI_LIST_END(ehci)))
+ last_status = -EINPROGRESS;
}
- if (likely(last_status == -EINPROGRESS))
- last_status = qtd_status;
/* if we're removing something not at the queue head,
* patch the hardware queue pointer.