FAILED: patch "[PATCH] usb: gadget: f_midi: added spinlock on transmit function" failed to apply to 4.5-stable tree

FAILED: patch "[PATCH] usb: gadget: f_midi: added spinlock on transmit function" failed to apply to 4.5-stable tree

[gregkh]

The patch below does not apply to the 4.5-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 9acdf4df2fc4680b08fa242b09717892cd687d4a Mon Sep 17 00:00:00 2001
From: "Felipe F. Tonello" <eu@felipetonello.com>
Date: Tue, 8 Mar 2016 20:21:47 +0000
Subject: [PATCH] usb: gadget: f_midi: added spinlock on transmit function

Since f_midi_transmit is called by both ALSA and USB sub-systems, it can
potentially cause a race condition between both calls because f_midi_transmit
is not reentrant nor thread-safe. This is due to an implementation detail that
the transmit function looks for the next available usb request from the fifo
and only enqueues it if there is data to send, otherwise just re-uses it. So,
if both ALSA and USB frameworks calls this function at the same time,
kfifo_seek() will return the same usb_request, which will cause a race
condition.

To solve this problem a syncronization mechanism is necessary. In this case it
is used a spinlock since f_midi_transmit is also called by usb_request->complete
callback in interrupt context.

Cc: <stable@vger.kernel.org> # v4.5+
Fixes: e1e3d7ec5da3 ("usb: gadget: f_midi: pre-allocate IN requests")
Signed-off-by: Felipe F. Tonello <eu@felipetonello.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index 84c0ee5ebd1e..56e2dde99b03 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/kfifo.h>
+#include <linux/spinlock.h>
 
 #include <sound/core.h>
 #include <sound/initval.h>
@@ -89,6 +90,7 @@ struct f_midi {
 	unsigned int buflen, qlen;
 	/* This fifo is used as a buffer ring for pre-allocated IN usb_requests */
 	DECLARE_KFIFO_PTR(in_req_fifo, struct usb_request *);
+	spinlock_t transmit_lock;
 	unsigned int in_last_port;
 
 	struct gmidi_in_port	in_ports_array[/* in_ports */];
@@ -597,17 +599,22 @@ static void f_midi_transmit(struct f_midi *midi)
 {
 	struct usb_ep *ep = midi->in_ep;
 	int ret;
+	unsigned long flags;
 
 	/* We only care about USB requests if IN endpoint is enabled */
 	if (!ep || !ep->enabled)
 		goto drop_out;
 
+	spin_lock_irqsave(&midi->transmit_lock, flags);
+
 	do {
 		ret = f_midi_do_transmit(midi, ep);
 		if (ret < 0)
 			goto drop_out;
 	} while (ret);
 
+	spin_unlock_irqrestore(&midi->transmit_lock, flags);
+
 	return;
 
 drop_out:
@@ -1201,6 +1208,8 @@ static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
 	if (status)
 		goto setup_fail;
 
+	spin_lock_init(&midi->transmit_lock);
+
 	++opts->refcnt;
 	mutex_unlock(&opts->lock);