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authorDaniel Glöckner <dg@emlix.com>2009-05-28 12:53:24 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-15 21:44:46 -0700
commit2e25134122c25ebb0679b4bbd536fb46c669f9d7 (patch)
treee839d96eaad759f314517e8ea5e28760dc715347 /drivers/usb/gadget
parent9b8e7ba68ad0e4273f4897950de65bc311552cd1 (diff)
USB: gadget: g_serial: append zlp when tx buffer becomes empty
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>
Diffstat (limited to 'drivers/usb/gadget')
-rw-r--r--drivers/usb/gadget/u_serial.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index 0a4d99ab40d..fc6e709f45b 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -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),