From 806e8f8fcc27e1753947bd9f059ba2316cf8f92a Mon Sep 17 00:00:00 2001 From: Mian Yousaf Kaukab Date: Thu, 24 Mar 2011 12:20:13 +0100 Subject: [PATCH] usb: usb_storage: do not align length of request for CBW to maxp size Mass-storage and file-storage gadgets align the length to maximum-packet-size when preparing the request to receive CBW. This is unnecessary and prevents the controller driver from knowing that a short-packet is expected. It is incorrect to set short_not_ok when preparing the request to receive CBW. CBW will be a short-packet so short_not_ok must not be set. This makes bh->bulk_out_intended_length unnecessary so it is also removed. Signed-off-by: Mian Yousaf Kaukab Acked-by: Michal Nazarewicz Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/f_mass_storage.c | 24 ++++-------------------- drivers/usb/gadget/file_storage.c | 28 ++++++---------------------- drivers/usb/gadget/storage_common.c | 7 ------- 3 files changed, 10 insertions(+), 49 deletions(-) diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c index 6d8e533949eb..125587ac5d0b 100644 --- a/drivers/usb/gadget/f_mass_storage.c +++ b/drivers/usb/gadget/f_mass_storage.c @@ -474,20 +474,6 @@ static int exception_in_progress(struct fsg_common *common) return common->state > FSG_STATE_IDLE; } -/* Make bulk-out requests be divisible by the maxpacket size */ -static void set_bulk_out_req_length(struct fsg_common *common, - struct fsg_buffhd *bh, unsigned int length) -{ - unsigned int rem; - - bh->bulk_out_intended_length = length; - rem = length % common->bulk_out_maxpacket; - if (rem > 0) - length += common->bulk_out_maxpacket - rem; - bh->outreq->length = length; -} - - /*-------------------------------------------------------------------------*/ static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep) @@ -586,9 +572,9 @@ static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) struct fsg_buffhd *bh = req->context; dump_msg(common, "bulk-out", req->buf, req->actual); - if (req->status || req->actual != bh->bulk_out_intended_length) + if (req->status || req->actual != req->length) DBG(common, "%s --> %d, %u/%u\n", __func__, - req->status, req->actual, bh->bulk_out_intended_length); + req->status, req->actual, req->length); if (req->status == -ECONNRESET) /* Request was cancelled */ usb_ep_fifo_flush(ep); @@ -975,7 +961,6 @@ static int do_write(struct fsg_common *common) * the bulk-out maxpacket size */ bh->outreq->length = amount; - bh->bulk_out_intended_length = amount; bh->outreq->short_not_ok = 1; if (!start_out_transfer(common, bh)) /* Dunno what to do if common->fsg is NULL */ @@ -1652,7 +1637,6 @@ static int throw_away_data(struct fsg_common *common) * the bulk-out maxpacket size. */ bh->outreq->length = amount; - bh->bulk_out_intended_length = amount; bh->outreq->short_not_ok = 1; if (!start_out_transfer(common, bh)) /* Dunno what to do if common->fsg is NULL */ @@ -2322,8 +2306,8 @@ static int get_next_command(struct fsg_common *common) } /* Queue a request to read a Bulk-only CBW */ - set_bulk_out_req_length(common, bh, USB_BULK_CB_WRAP_LEN); - bh->outreq->short_not_ok = 1; + bh->outreq->length = USB_BULK_CB_WRAP_LEN; + bh->outreq->short_not_ok = 0; if (!start_out_transfer(common, bh)) /* Don't know what to do if common->fsg is NULL */ return -EIO; diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c index a6eacb59571b..d04e0e6b019d 100644 --- a/drivers/usb/gadget/file_storage.c +++ b/drivers/usb/gadget/file_storage.c @@ -497,19 +497,6 @@ static int exception_in_progress(struct fsg_dev *fsg) return (fsg->state > FSG_STATE_IDLE); } -/* Make bulk-out requests be divisible by the maxpacket size */ -static void set_bulk_out_req_length(struct fsg_dev *fsg, - struct fsg_buffhd *bh, unsigned int length) -{ - unsigned int rem; - - bh->bulk_out_intended_length = length; - rem = length % fsg->bulk_out_maxpacket; - if (rem > 0) - length += fsg->bulk_out_maxpacket - rem; - bh->outreq->length = length; -} - static struct fsg_dev *the_fsg; static struct usb_gadget_driver fsg_driver; @@ -730,10 +717,9 @@ static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) struct fsg_buffhd *bh = req->context; dump_msg(fsg, "bulk-out", req->buf, req->actual); - if (req->status || req->actual != bh->bulk_out_intended_length) + if (req->status || req->actual != req->length) DBG(fsg, "%s --> %d, %u/%u\n", __func__, - req->status, req->actual, - bh->bulk_out_intended_length); + req->status, req->actual, req->length); if (req->status == -ECONNRESET) // Request was cancelled usb_ep_fifo_flush(ep); @@ -1349,8 +1335,7 @@ static int do_write(struct fsg_dev *fsg) /* amount is always divisible by 512, hence by * the bulk-out maxpacket size */ - bh->outreq->length = bh->bulk_out_intended_length = - amount; + bh->outreq->length = amount; bh->outreq->short_not_ok = 1; start_transfer(fsg, fsg->bulk_out, bh->outreq, &bh->outreq_busy, &bh->state); @@ -2010,8 +1995,7 @@ static int throw_away_data(struct fsg_dev *fsg) /* amount is always divisible by 512, hence by * the bulk-out maxpacket size */ - bh->outreq->length = bh->bulk_out_intended_length = - amount; + bh->outreq->length = amount; bh->outreq->short_not_ok = 1; start_transfer(fsg, fsg->bulk_out, bh->outreq, &bh->outreq_busy, &bh->state); @@ -2688,8 +2672,8 @@ static int get_next_command(struct fsg_dev *fsg) } /* Queue a request to read a Bulk-only CBW */ - set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN); - bh->outreq->short_not_ok = 1; + bh->outreq->length = USB_BULK_CB_WRAP_LEN; + bh->outreq->short_not_ok = 0; start_transfer(fsg, fsg->bulk_out, bh->outreq, &bh->outreq_busy, &bh->state); diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c index b015561fd602..3179b8bb6ced 100644 --- a/drivers/usb/gadget/storage_common.c +++ b/drivers/usb/gadget/storage_common.c @@ -286,13 +286,6 @@ struct fsg_buffhd { enum fsg_buffer_state state; struct fsg_buffhd *next; - /* - * The NetChip 2280 is faster, and handles some protocol faults - * better, if we don't submit any short bulk-out read requests. - * So we will record the intended request length here. - */ - unsigned int bulk_out_intended_length; - struct usb_request *inreq; int inreq_busy; struct usb_request *outreq; -- 2.20.1