On Thu, 28 May 2020 at 12:49, gregkh@linuxfoundation.org wrote:
This is a note to let you know that I've just added the patch titled
serial: imx: Initialize lock for non-registered consoleto my tty git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git in the tty-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 8f065acec7573672dd15916e31d1e9b2e785566c Mon Sep 17 00:00:00 2001 From: Andy Shevchenko andriy.shevchenko@linux.intel.com Date: Mon, 25 May 2020 13:59:52 +0300 Subject: serial: imx: Initialize lock for non-registered console
The commit a3cb39d258ef ("serial: core: Allow detach and attach serial device for console") changed a bit logic behind lock initialization since for most of the console driver it's supposed to have lock already initialized even if console is not enabled. However, it's not the case for Freescale IMX console.
Initialize lock explicitly in the ->probe().
Note, there is still an open question should or shouldn't not this driver register console properly.
Fixes: a3cb39d258ef ("serial: core: Allow detach and attach serial device for console") Reported-by: Guenter Roeck linux@roeck-us.net Cc: stable stable@vger.kernel.org Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Link: https://lore.kernel.org/r/20200525105952.13744-1-andriy.shevchenko@linux.int... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
drivers/tty/serial/imx.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 986d902fb7fe..6b078e395931 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -2404,6 +2404,9 @@ static int imx_uart_probe(struct platform_device *pdev) } }
/* We need to initialize lock even for non-registered console */spin_lock_init(&sport->port.lock);
On arm64 Hikey devices running stable-rc 5.7 branch kernel reported following kernel INFO while booting.
[ 2.059344] mmc2: new SDIO card at address 0001 [ 2.105114] f7111000.uart: ttyAMA1 at MMIO 0xf7111000 (irq = 8, base_baud = 0) is a PL011 rev2 [ 2.105886] serial serial0: tty port ttyAMA1 registered [ 2.106843] f7112000.uart: ttyAMA2 at MMIO 0xf7112000 (irq = 9, base_baud = 0) is a PL011 rev2 [ 2.109759] f7113000.uart: ttyAMA3 at MMIO 0xf7113000 (irq = 10, base_baud = 0) is a PL011 rev2 [ 2.109916] INFO: trying to register non-static key. [ 2.109936] the code is fine but needs lockdep annotation. [ 2.109956] turning off the locking correctness validator. [ 2.109982] CPU: 2 PID: 57 Comm: kworker/2:1 Not tainted 5.7.3-rc1 #1 [ 2.110004] Hardware name: HiKey Development Board (DT) [ 2.110040] Workqueue: events deferred_probe_work_func [ 2.110063] Call trace: [ 2.110082] dump_backtrace+0x0/0x1e0 [ 2.110100] show_stack+0x24/0x30 [ 2.110120] dump_stack+0xe8/0x150 [ 2.110140] register_lock_class+0x640/0x680 [ 2.110159] __lock_acquire+0x7c/0x1728 [ 2.110178] lock_acquire+0xf8/0x458 [ 2.110200] _raw_spin_lock_irqsave+0x60/0x80 [ 2.110221] uart_add_one_port+0x3ac/0x4e8 [ 2.110242] pl011_register_port+0x70/0xd8 [ 2.110262] pl011_probe+0x154/0x1a0 [ 2.110283] amba_probe+0xcc/0x170 [ 2.110301] really_probe+0x290/0x498 [ 2.110319] driver_probe_device+0x12c/0x148 [ 2.110339] __device_attach_driver+0xa4/0x120 [ 2.110359] bus_for_each_drv+0x78/0xd8 [ 2.110378] __device_attach+0xe8/0x170 [ 2.110397] device_initial_probe+0x24/0x30 [ 2.110416] bus_probe_device+0xa0/0xa8 [ 2.110435] deferred_probe_work_func+0x94/0xf0 [ 2.110458] process_one_work+0x2b0/0x770 [ 2.110477] worker_thread+0x48/0x4a0 [ 2.110496] kthread+0x158/0x168 [ 2.110515] ret_from_fork+0x10/0x18 [ 4.158216] printk: console [ttyAMA3] enabled [ 4.165009] 5V_HUB: supplied by SYS_5V
Please refer full test log, https://lkft.validation.linaro.org/scheduler/job/1496830#L3764
metadata: git branch: linux-5.7.y git repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git commit: f2c964aa9a1ce76f00767fd3fdcebf8e0db2b99e kernel-config: http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/hikey/lkft/linux-sta...
-- Linaro LKFT https://lkft.linaro.org