The driver prevents using the same numbered Rx/Tx endpoints simultaneously for the periodic transfers -- which would actually be correct unless they share the same FIFO. Use 'in_qh' and 'out_qh' fields of the 'struct musb_hw_ep' to check the endpoint's business and get rid of now completely useless 'periodic' array in the 'struct musb'. While at it, optimize the loop induction variable in the endpoint lookup code and remove duplicate/unneeded code elsewhere... Signed-off-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx> --- This is hopefully a better replacement for the patch originally posted by Ajay Kumar Gupta (http://marc.info/?l=linux-usb&m=122337221417651). The patch is against the recent Linus' kernel... drivers/usb/musb/musb_host.c | 27 ++++++++++----------------- 1 files changed, 10 insertions(+), 17 deletions(-) Index: linux-2.6/drivers/usb/musb/musb_host.c =================================================================== --- linux-2.6.orig/drivers/usb/musb/musb_host.c +++ linux-2.6/drivers/usb/musb/musb_host.c @@ -400,7 +400,6 @@ musb_giveback(struct musb_qh *qh, struct * de-allocated if it's tracked and allocated; * and where we'd update the schedule tree... */ - musb->periodic[ep->epnum] = NULL; kfree(qh); qh = NULL; break; @@ -1716,31 +1715,26 @@ static int musb_schedule( /* else, periodic transfers get muxed to other endpoints */ - /* FIXME this doesn't consider direction, so it can only - * work for one half of the endpoint hardware, and assumes - * the previous cases handled all non-shared endpoints... - */ - - /* we know this qh hasn't been scheduled, so all we need to do + /* + * We know this qh hasn't been scheduled, so all we need to do * is choose which hardware endpoint to put it on ... * * REVISIT what we really want here is a regular schedule tree - * like e.g. OHCI uses, but for now musb->periodic is just an - * array of the _single_ logical endpoint associated with a - * given physical one (identity mapping logical->physical). - * - * that simplistic approach makes TT scheduling a lot simpler; - * there is none, and thus none of its complexity... + * like e.g. OHCI uses. */ best_diff = 4096; best_end = -1; - for (epnum = 1; epnum < musb->nr_endpoints; epnum++) { + for (epnum = 1, hw_ep = musb->endpoints + 1; epnum < musb->nr_endpoints; + epnum++, hw_ep++) { int diff; - if (musb->periodic[epnum]) + if (is_in || hw_ep->is_shared_fifo) { + if (hw_ep->in_qh != NULL) + continue; + } else if (hw_ep->out_qh != NULL) continue; - hw_ep = &musb->endpoints[epnum]; + if (hw_ep == musb->bulk_ep) continue; @@ -1769,7 +1763,6 @@ static int musb_schedule( idle = 1; qh->mux = 0; hw_ep = musb->endpoints + best_end; - musb->periodic[best_end] = qh; DBG(4, "qh %p periodic slot %d\n", qh, best_end); success: if (head) { -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
