patch "w1: omap-hdq: fix missing bus unregister at removal" added to char-misc-next

[<gregkh@linuxfoundation.org>]

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

    w1: omap-hdq: fix missing bus unregister at removal

to my char-misc git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-next branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release
during the merge window.

If you have any questions about this process, please let me know.


>From a007734618fee1bf35556c04fa498d41d42c7301 Mon Sep 17 00:00:00 2001
From: Andreas Kemnade <andreas@kemnade.info>
Date: Sat, 22 Sep 2018 21:20:54 +0200
Subject: w1: omap-hdq: fix missing bus unregister at removal

The bus master was not removed after unloading the module
or unbinding the driver. That lead to oopses like this

[  127.842987] Unable to handle kernel paging request at virtual address bf01d04c
[  127.850646] pgd = 70e3cd9a
[  127.853698] [bf01d04c] *pgd=8f908811, *pte=00000000, *ppte=00000000
[  127.860412] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM
[  127.866668] Modules linked in: bq27xxx_battery overlay [last unloaded: omap_hdq]
[  127.874542] CPU: 0 PID: 1022 Comm: w1_bus_master1 Not tainted 4.19.0-rc4-00001-g2d51da718324 #12
[  127.883819] Hardware name: Generic OMAP36xx (Flattened Device Tree)
[  127.890441] PC is at 0xbf01d04c
[  127.893798] LR is at w1_search_process_cb+0x4c/0xfc
[  127.898956] pc : [<bf01d04c>]    lr : [<c05f9580>]    psr: a0070013
[  127.905609] sp : cf885f48  ip : bf01d04c  fp : ddf1e11c
[  127.911132] r10: cf8fe040  r9 : c05f8d00  r8 : cf8fe040
[  127.916656] r7 : 000000f0  r6 : cf8fe02c  r5 : cf8fe000  r4 : cf8fe01c
[  127.923553] r3 : c05f8d00  r2 : 000000f0  r1 : cf8fe000  r0 : dde1ef10
[  127.930450] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[  127.938018] Control: 10c5387d  Table: 8f8f0019  DAC: 00000051
[  127.944091] Process w1_bus_master1 (pid: 1022, stack limit = 0x9135699f)
[  127.951171] Stack: (0xcf885f48 to 0xcf886000)
[  127.955810] 5f40:                   cf8fe000 00000000 cf884000 cf8fe090 000003e8 c05f8d00
[  127.964477] 5f60: dde5fc34 c05f9700 ddf1e100 ddf1e540 cf884000 cf8fe000 c05f9694 00000000
[  127.973114] 5f80: dde5fc34 c01499a4 00000000 ddf1e540 c0149874 00000000 00000000 00000000
[  127.981781] 5fa0: 00000000 00000000 00000000 c01010e8 00000000 00000000 00000000 00000000
[  127.990447] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  127.999114] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[  128.007781] [<c05f9580>] (w1_search_process_cb) from [<c05f9700>] (w1_process+0x6c/0x118)
[  128.016479] [<c05f9700>] (w1_process) from [<c01499a4>] (kthread+0x130/0x148)
[  128.024047] [<c01499a4>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[  128.031677] Exception stack(0xcf885fb0 to 0xcf885ff8)
[  128.037017] 5fa0:                                     00000000 00000000 00000000 00000000
[  128.045684] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  128.054351] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[  128.061340] Code: bad PC value
[  128.064697] ---[ end trace af066e33c0e14119 ]---

Cc: <stable@vger.kernel.org>
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/w1/masters/omap_hdq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index 83fc9aab34e8..3099052e1243 100644
--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -763,6 +763,8 @@ static int omap_hdq_remove(struct platform_device *pdev)
 	/* remove module dependency */
 	pm_runtime_disable(&pdev->dev);
 
+	w1_remove_master_device(&omap_w1_master);
+
 	return 0;
 }
 
-- 
2.19.0