Messages in this thread Patch in this message | | | Date | Sat, 06 Sep 2008 00:51:10 -0400 | From | sangsu <> | Subject | [PATCH] USB: g_file_storage: fix handling zero-length packet |
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According to "CH 5.5.3. Control Transfer Packet Size Constraints", Zero-length packet should be sent when the last data payload size is equal to the endpoint's MaxPacketSize. This patch helps g_file_storage send zero-length packet properly.
This is tested in s3c2440/s5c7329 architectures and works well.
Signed-off-by: SangSu Park<sangsu@gmail.com> --- driver/usb/gadget/file_storage.c | 3++- 1 files changed, 2 insertion(+), 1 deletions(-)
--- a/drivers/usb/gadget/file_storage.c 2008-09-01 11:13:03.000000000 -0400 +++ b/drivers/usb/gadget/file_storage.c 2008-09-01 11:16:41.000000000 -0400 @@ -1463,7 +1463,8 @@ if (rc >= 0 && rc != DELAYED_STATUS) { rc = min(rc, w_length); fsg->ep0req->length = rc; - fsg->ep0req->zero = rc < w_length; + fsg->ep0req->zero = rc < w_length + && (rc % gadget->ep0->maxpacket) == 0; fsg->ep0req_name = (ctrl->bRequestType & USB_DIR_IN ? "ep0-in" : "ep0-out"); rc = ep0_queue(fsg);
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