From 68b43caf4a4b98256bdb67dba025f858bdf21725 Mon Sep 17 00:00:00 2001 From: Hemant Kumar Date: Tue, 9 Jan 2018 12:30:53 +0530 Subject: usb: f_fs: Prevent gadget unbind if it is already unbound commit ce5bf9a50daf2d9078b505aca1cea22e88ecb94a upstream. Upon usb composition switch there is possibility of ep0 file release happening after gadget driver bind. In case of composition switch from adb to a non-adb composition gadget will never gets bound again resulting into failure of usb device enumeration. Fix this issue by checking FFS_FL_BOUND flag and avoid extra gadget driver unbind if it is already done as part of composition switch. This fixes adb reconnection error reported on Android running v4.4 and above kernel versions. Verified on Hikey running vanilla v4.15-rc7 + few out of tree Mali patches. Reviewed-at: https://android-review.googlesource.com/#/c/582632/ Cc: Felipe Balbi Cc: Greg KH Cc: Michal Nazarewicz Cc: John Stultz Cc: Dmitry Shmidt Cc: Badhri Cc: Android Kernel Team Signed-off-by: Hemant Kumar [AmitP: Cherry-picked it from android-4.14 and updated the commit log] Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/f_fs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/usb') diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 39bb65265bff..eb298daf49c7 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -3490,7 +3490,8 @@ static void ffs_closed(struct ffs_data *ffs) ci = opts->func_inst.group.cg_item.ci_parent->ci_parent; ffs_dev_unlock(); - unregister_gadget_item(ci); + if (test_bit(FFS_FL_BOUND, &ffs->flags)) + unregister_gadget_item(ci); return; done: ffs_dev_unlock(); -- cgit v1.2.3