Public bug reported:
SRU Justification:
------------------
Impact:
-------
Kernel crash upon shutdown or rebooting the device.
Test case:
----------
1) Power up the device, Redpine modules are loaded by default.
2) Reboot or shutdown the device.
3) Observe the behavior.
Result:
-------
Redpine driver crashes the entire kernel and below is the crash log.
... skipping ...
[ 47.002030] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000038
[ 47.010828] IP: rsi_shutdown+0x2c/0x100 [rsi_sdio]
[ 47.016180] PGD 0 P4D 0
[ 47.019025] Oops: 0000 1 SMP PTI
[ 47.136275] CPU: 1 PID: 1 Comm: systemd-shutdow Not tainted
4.15.0-1035-oem #40-Ubuntu
[ 47.145131] Hardware name: Dell Inc. Edge Gateway 3001/0YMHCG,
BIOS 01.00.08 10/23/2018
[ 47.154096] RIP: 0010:rsi_shutdown+0x2c/0x100 [rsi_sdio]
[ 47.160039] RSP: 0018:ffffb08d0000bd78 EFLAGS: 00010246
[ 47.165887] RAX: 0000000000000000 RBX: ffffa08b77f1d000 RCX:
0000000000000000
[ 47.173869] RDX: 0000000000000002 RSI: ffffffffc07aa77f RDI:
0000000000000001
[ 47.181851] RBP: ffffb08d0000bd90 R08: 0000000000000000 R09:
ffffb08d0000bc50
[ 47.189834] R10: 0000000000000000 R11: 000000000000023a R12:
ffffa08b6d940000
[ 47.197816] R13: ffffa08b3cbfb408 R14: ffffffff8f556137 R15:
ffffa08b3cbfb468
[ 47.205801] FS: 00007f85cd093940(0000) GS:ffffa08b70b00000(0000)
knlGS:0000000000000000
[ 47.214854] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 47.221281] CR2: 0000000000000038 CR3: 000000006a930000 CR4:
00000000001006e0
[ 47.229262] Call Trace:
[ 47.232017] device_shutdown+0x14e/0x200
[ 47.236416] kernel_power_off+0x35/0x70
[ 47.240711] SYSC_reboot+0x132/0x210
[ 47.244721] ? SYSC_rt_sigtimedwait+0x88/0xe0
[ 47.249604] ? do_writev+0x61/0xf0
[ 47.253411] ? do_writev+0x61/0xf0
[ 47.257219] ? sigprocmask+0x6f/0xa0
[ 47.261225] SyS_reboot+0xe/0x10
[ 47.264841] do_syscall_64+0x73/0x130
[ 47.268945] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Root cause analysis:
--------------------
Device operating mode 8(bluetooth alone), our driver supports multiple
modes like 13(WiFi + Bluetooth), WiFi related structures are not been
initialized in Bluetooth alone mode(8), dereferencing them in rsi_shutdown
function causes crash. In Redpine driver, this NULL check is missed. Hence,
Added the fix for the same.
Fix:
----
Added proper NULL check in rsi_shutdown function.
Regression Potential:
---------------------
This is a very direct issue, since the driver is getting crashed while
reboot. We rebooted multiples times, checked the driver stability. Every thing
ran smooth.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: bionic verification-done-bionic
** Patch added: "This patch fixes the crash"
https://bugs.launchpad.net/bugs/1836215/+attachment/5276506/+files/0001-rsi-system-crashed-while-reboot-shutdown.patch
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https://bugs.launchpad.net/bugs/1836215
Title:
[DELL][BIONICS][RSI] Redpine driver got crashed during shutdown/reboot
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