[source] generic: backport dwc2 kernel panic fix

[LEDE Commits]

mkresin pushed a commit to source.git, branch master:
https://git.lede-project.org/b35a41c139ec995e1d3096ce962f020053f3056e

commit b35a41c139ec995e1d3096ce962f020053f3056e
Author: Mathias Kresin <dev at kresin.me>
AuthorDate: Thu Dec 29 21:47:54 2016 +0100

    generic: backport dwc2 kernel panic fix
    
    In case the soft reset in dwc2_core_reset() timeouts, the
    hsotg->core_params are freed albeit it is owned by the core. This
    results into a kernel panic as shown in FS#351.
    
    Signed-off-by: Mathias Kresin <dev at kresin.me>
---
 .../098-usb-dwc2-Remove-unnecessary-kfree.patch    | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/target/linux/generic/patches-4.4/098-usb-dwc2-Remove-unnecessary-kfree.patch b/target/linux/generic/patches-4.4/098-usb-dwc2-Remove-unnecessary-kfree.patch
new file mode 100644
index 0000000..3a27fea
--- /dev/null
+++ b/target/linux/generic/patches-4.4/098-usb-dwc2-Remove-unnecessary-kfree.patch
@@ -0,0 +1,24 @@
+From cd4b1e34655d46950c065d9284b596cd8d7b28cd Mon Sep 17 00:00:00 2001
+From: John Youn <johnyoun at synopsys.com>
+Date: Thu, 3 Nov 2016 17:55:45 -0700
+Subject: [PATCH] usb: dwc2: Remove unnecessary kfree
+
+This shouldn't be freed by the HCD as it is owned by the core and
+allocated with devm_kzalloc.
+
+Signed-off-by: John Youn <johnyoun at synopsys.com>
+Signed-off-by: Felipe Balbi <felipe.balbi at linux.intel.com>
+---
+ drivers/usb/dwc2/hcd.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+--- a/drivers/usb/dwc2/hcd.c
++++ b/drivers/usb/dwc2/hcd.c
+@@ -3160,7 +3160,6 @@ error3:
+ error2:
+ 	usb_put_hcd(hcd);
+ error1:
+-	kfree(hsotg->core_params);
+ 
+ #ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
+ 	kfree(hsotg->last_frame_num_array);