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USB: gadget: g_serial: append zlp when tx buffer becomes empty

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Some usb serial host drivers expect a short packet before they forward
the data to the application. This is caused by them trying to read more
than one packet at a time. So when the gadget sends an exact multiple
of the maximum packet size, it should append a zero-length packet.

Signed-off-by: Daniel Glöckner <dg@emlix.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Daniel Glöckner 2009-05-28 12:53:24 +02:00 committed by Greg Kroah-Hartman
parent 9b8e7ba68a
commit 2e25134122
1 changed files with 1 additions and 0 deletions
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drivers/usb/gadget/u_serial.c
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@ -371,6 +371,7 @@ __acquires(&port->port_lock)
req->length = len;
list_del(&req->list);
req->zero = (gs_buf_data_avail(&port->port_write_buf) == 0);
pr_vdebug(PREFIX "%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n",
port->port_num, len, *((u8 *)req->buf),