[lkml]   [2017]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 4.12 27/65] usb: musb: fix tx fifo flush handling again
4.12-stable review patch.  If anyone has any objections, please let me know.


From: Bin Liu <>

commit 45d73860530a14c608f410b91c6c341777bfa85d upstream.

commit 68fe05e2a451 ("usb: musb: fix tx fifo flush handling") drops the
1ms delay trying to solve the long disconnect time issue when
application queued many tx urbs. However, the 1ms delay is needed for
some use cases, for example, without the delay, reconnecting AR9271 WIFI
dongle no longer works if the connection is dropped from the AP.

So let's add back the 1ms delay in musb_h_tx_flush_fifo(), and solve the
long disconnect time problem with a separate patch for

Signed-off-by: Bin Liu <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/usb/musb/musb_host.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -139,6 +139,7 @@ static void musb_h_tx_flush_fifo(struct
"Could not flush host TX%d fifo: csr: %04x\n",
ep->epnum, csr))
+ mdelay(1);

 \ /
  Last update: 2017-08-15 03:20    [W:0.226 / U:0.480 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site