The patch titled
usb: g_serial: append zlp when tx buffer becomes empty
has been added to the -mm tree. Its filename is
usb-g_serial-append-zlp-when-tx-buffer-becomes-empty.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: usb: g_serial: append zlp when tx buffer becomes empty
From: Daniel Glockner <dg@xxxxxxxxx>
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 Glockner <dg@xxxxxxxxx>
Cc: David Brownell <david-b@xxxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/u_serial.c | 1 +
1 file changed, 1 insertion(+)
diff -puN drivers/usb/gadget/u_serial.c~usb-g_serial-append-zlp-when-tx-buffer-becomes-empty drivers/usb/gadget/u_serial.c
--- a/drivers/usb/gadget/u_serial.c~usb-g_serial-append-zlp-when-tx-buffer-becomes-empty
+++ a/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),
_
Patches currently in -mm which might be from dg@xxxxxxxxx are
linux-next.patch
usb-g_serial-append-zlp-when-tx-buffer-becomes-empty.patch
xtensa-variant-specific-code.patch
xtensa-cache-inquiry-and-unaligned-cache-handling-functions.patch
xtensa-s6000-dma-engine-support.patch
xtensa-allow-platform-and-variant-to-initialize-own-irq-chips.patch
xtensa-support-s6000-gpio-irqs-and-alternate-function-selection.patch
s6gmac-xtensa-s6000-on-chip-ethernet-driver.patch
xtensa-s6105-specific-configuration-for-s6gmac.patch
xtensa-enable-s6gmac-in-s6105_defconfig.patch
xtensa-add-m41t62-rtc-to-s6105-platform.patch
xtensa-enable-m41t80-driver-in-s6105_defconfig.patch
atmel-lcdc-fix-pixclock-upper-bound-detection.patch
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