Patch "usb: dwc3: of-simple: fix oops by unbalanced clk disable call" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

usb: dwc3: of-simple: fix oops by unbalanced clk disable call

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
usb-dwc3-of-simple-fix-oops-by-unbalanced-clk-disable-call.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Enric Balletbo i Serra <[email protected]>
Date: Mon, 18 Dec 2017 16:14:36 +0100
Subject: usb: dwc3: of-simple: fix oops by unbalanced clk disable call

From: Enric Balletbo i Serra <[email protected]>

commit bff52352e0ccc2481f2b6b0d612ff8ff56c50f3a upstream.

dwc3_of_simple_dev_pm_ops has never been used since commit a0d8c4cfdf31 ("usb: dwc3: of-simple: set dev_pm_ops"), but this commit has brought and oops when unbind the device due this sequence:

dwc3_of_simple_remove
-> clk_disable ...

      -> pm_runtime_put_sync
         -> dwc3_of_simple_runtime_suspend
            -> clk_disable (again)

This double call to clk_core_disable causes a kernel oops like this:

 WARNING: CPU: 1 PID: 4022 at drivers/clk/clk.c:656 clk_core_disable+0x78/0x80
 CPU: 1 PID: 4022 Comm: bash Not tainted 4.15.0-rc4+ #44
 Hardware name: Google Kevin (DT)
 pstate: 80000085 (Nzcv daIf -PAN -UAO)
 pc : clk_core_disable+0x78/0x80
 lr : clk_core_disable_lock+0x20/0x38
 sp : ffff00000bbf3a90
 ...
 Call trace:
  clk_core_disable+0x78/0x80
  clk_disable+0x1c/0x30
  dwc3_of_simple_runtime_suspend+0x30/0x50
  pm_generic_runtime_suspend+0x28/0x40

This patch fixes the unbalanced clk disable call by setting the num_clocks variable to zero once the clocks were disabled.

---
 drivers/usb/dwc3/dwc3-of-simple.c |    1 +
 1 file changed, 1 insertion(+)

@@ -143,6 +143,7 @@ static int dwc3_of_simple_remove(struct
 		clk_disable_unprepare(simple->clks[i]);
 		clk_put(simple->clks[i]);
 	}
+	simple->num_clocks = 0;
 
 	reset_control_assert(simple->resets);
 	reset_control_put(simple->resets);

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/usb-dwc3-of-simple-fix-oops-by-unbalanced-clk-disable-call.patch