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authorHemant Kumar <hemantk@codeaurora.org>2018-01-09 12:30:53 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-03 17:39:21 +0100
commit75816a439f6589b8f14d10c4b5f8c835ad76e036 (patch)
parent1c226267c2259112a9825d09a8c715568c3d8d10 (diff)
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 <balbi@kernel.org> Cc: Greg KH <gregkh@linux-foundation.org> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Dmitry Shmidt <dimitrysh@google.com> Cc: Badhri <badhri@google.com> Cc: Android Kernel Team <kernel-team@android.com> Signed-off-by: Hemant Kumar <hemantk@codeaurora.org> [AmitP: Cherry-picked it from android-4.14 and updated the commit log] Signed-off-by: Amit Pundir <amit.pundir@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 876cdbec1307..c0491dd73f53 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -3704,7 +3704,8 @@ static void ffs_closed(struct ffs_data *ffs)
ci = opts->func_inst.group.cg_item.ci_parent->ci_parent;
- unregister_gadget_item(ci);
+ if (test_bit(FFS_FL_BOUND, &ffs->flags))
+ unregister_gadget_item(ci);