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| author | Daniel Glöckner <dg@emlix.com> | 2009-05-28 12:53:24 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-06-15 21:44:46 -0700 |
| commit | 2e25134122c25ebb0679b4bbd536fb46c669f9d7 (patch) | |
| tree | e839d96eaad759f314517e8ea5e28760dc715347 /drivers/usb/gadget/u_serial.c | |
| parent | 9b8e7ba68ad0e4273f4897950de65bc311552cd1 (diff) | |
| download | kernel-crypto-2e25134122c25ebb0679b4bbd536fb46c669f9d7.tar.gz kernel-crypto-2e25134122c25ebb0679b4bbd536fb46c669f9d7.tar.xz kernel-crypto-2e25134122c25ebb0679b4bbd536fb46c669f9d7.zip | |
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/u_serial.c')
| -rw-r--r-- | drivers/usb/gadget/u_serial.c | 1 |
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), |