* [PATCH AUTOSEL 4.4 36/64] serial: 8250_omap: Fix sleeping function called from invalid context during probe
[not found] <20200918021643.2067895-1-sashal@kernel.org>
@ 2020-09-18 2:16 ` Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 42/64] serial: uartps: Wait for tx_empty in console setup Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 51/64] tty: serial: samsung: Correct clock selection logic Sasha Levin
2 siblings, 0 replies; 5+ messages in thread
From: Sasha Levin @ 2020-09-18 2:16 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Peter Ujfalusi, Tomi Valkeinen, Greg Kroah-Hartman, Sasha Levin,
linux-serial
From: Peter Ujfalusi <peter.ujfalusi@ti.com>
[ Upstream commit 4ce35a3617c0ac758c61122b2218b6c8c9ac9398 ]
When booting j721e the following bug is printed:
[ 1.154821] BUG: sleeping function called from invalid context at kernel/sched/completion.c:99
[ 1.154827] in_atomic(): 0, irqs_disabled(): 128, non_block: 0, pid: 12, name: kworker/0:1
[ 1.154832] 3 locks held by kworker/0:1/12:
[ 1.154836] #0: ffff000840030728 ((wq_completion)events){+.+.}, at: process_one_work+0x1d4/0x6e8
[ 1.154852] #1: ffff80001214fdd8 (deferred_probe_work){+.+.}, at: process_one_work+0x1d4/0x6e8
[ 1.154860] #2: ffff00084060b170 (&dev->mutex){....}, at: __device_attach+0x38/0x138
[ 1.154872] irq event stamp: 63096
[ 1.154881] hardirqs last enabled at (63095): [<ffff800010b74318>] _raw_spin_unlock_irqrestore+0x70/0x78
[ 1.154887] hardirqs last disabled at (63096): [<ffff800010b740d8>] _raw_spin_lock_irqsave+0x28/0x80
[ 1.154893] softirqs last enabled at (62254): [<ffff800010080c88>] _stext+0x488/0x564
[ 1.154899] softirqs last disabled at (62247): [<ffff8000100fdb3c>] irq_exit+0x114/0x140
[ 1.154906] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.6.0-rc6-next-20200318-00094-g45e4089b0bd3 #221
[ 1.154911] Hardware name: Texas Instruments K3 J721E SoC (DT)
[ 1.154917] Workqueue: events deferred_probe_work_func
[ 1.154923] Call trace:
[ 1.154928] dump_backtrace+0x0/0x190
[ 1.154933] show_stack+0x14/0x20
[ 1.154940] dump_stack+0xe0/0x148
[ 1.154946] ___might_sleep+0x150/0x1f0
[ 1.154952] __might_sleep+0x4c/0x80
[ 1.154957] wait_for_completion_timeout+0x40/0x140
[ 1.154964] ti_sci_set_device_state+0xa0/0x158
[ 1.154969] ti_sci_cmd_get_device_exclusive+0x14/0x20
[ 1.154977] ti_sci_dev_start+0x34/0x50
[ 1.154984] genpd_runtime_resume+0x78/0x1f8
[ 1.154991] __rpm_callback+0x3c/0x140
[ 1.154996] rpm_callback+0x20/0x80
[ 1.155001] rpm_resume+0x568/0x758
[ 1.155007] __pm_runtime_resume+0x44/0xb0
[ 1.155013] omap8250_probe+0x2b4/0x508
[ 1.155019] platform_drv_probe+0x50/0xa0
[ 1.155023] really_probe+0xd4/0x318
[ 1.155028] driver_probe_device+0x54/0xe8
[ 1.155033] __device_attach_driver+0x80/0xb8
[ 1.155039] bus_for_each_drv+0x74/0xc0
[ 1.155044] __device_attach+0xdc/0x138
[ 1.155049] device_initial_probe+0x10/0x18
[ 1.155053] bus_probe_device+0x98/0xa0
[ 1.155058] deferred_probe_work_func+0x74/0xb0
[ 1.155063] process_one_work+0x280/0x6e8
[ 1.155068] worker_thread+0x48/0x430
[ 1.155073] kthread+0x108/0x138
[ 1.155079] ret_from_fork+0x10/0x18
To fix the bug we need to first call pm_runtime_enable() prior to any
pm_runtime calls.
Reported-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20200320125200.6772-1-peter.ujfalusi@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/tty/serial/8250/8250_omap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index c4383573cf668..0377b35d62b80 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1188,11 +1188,11 @@ static int omap8250_probe(struct platform_device *pdev)
spin_lock_init(&priv->rx_dma_lock);
device_init_wakeup(&pdev->dev, true);
+ pm_runtime_enable(&pdev->dev);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, -1);
pm_runtime_irq_safe(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH AUTOSEL 4.4 42/64] serial: uartps: Wait for tx_empty in console setup
[not found] <20200918021643.2067895-1-sashal@kernel.org>
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 36/64] serial: 8250_omap: Fix sleeping function called from invalid context during probe Sasha Levin
@ 2020-09-18 2:16 ` Sasha Levin
2020-09-28 20:16 ` Naresh Kamboju
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 51/64] tty: serial: samsung: Correct clock selection logic Sasha Levin
2 siblings, 1 reply; 5+ messages in thread
From: Sasha Levin @ 2020-09-18 2:16 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Raviteja Narayanam, Shubhrajyoti Datta, Greg Kroah-Hartman,
Sasha Levin, linux-serial, linux-arm-kernel
From: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
[ Upstream commit 42e11948ddf68b9f799cad8c0ddeab0a39da33e8 ]
On some platforms, the log is corrupted while console is being
registered. It is observed that when set_termios is called, there
are still some bytes in the FIFO to be transmitted.
So, wait for tx_empty inside cdns_uart_console_setup before calling
set_termios.
Signed-off-by: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
Reviewed-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/1586413563-29125-2-git-send-email-raviteja.narayanam@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/tty/serial/xilinx_uartps.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 06efcef1b4953..5b4469098888a 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1152,6 +1152,7 @@ static int cdns_uart_console_setup(struct console *co, char *options)
int bits = 8;
int parity = 'n';
int flow = 'n';
+ unsigned long time_out;
if (co->index < 0 || co->index >= CDNS_UART_NR_PORTS)
return -EINVAL;
@@ -1165,6 +1166,13 @@ static int cdns_uart_console_setup(struct console *co, char *options)
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
+ /* Wait for tx_empty before setting up the console */
+ time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT);
+
+ while (time_before(jiffies, time_out) &&
+ cdns_uart_tx_empty(port) != TIOCSER_TEMT)
+ cpu_relax();
+
return uart_set_options(port, co, baud, parity, bits, flow);
}
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH AUTOSEL 4.4 42/64] serial: uartps: Wait for tx_empty in console setup
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 42/64] serial: uartps: Wait for tx_empty in console setup Sasha Levin
@ 2020-09-28 20:16 ` Naresh Kamboju
2020-09-28 22:00 ` Sasha Levin
0 siblings, 1 reply; 5+ messages in thread
From: Naresh Kamboju @ 2020-09-28 20:16 UTC (permalink / raw)
To: Sasha Levin
Cc: open list, linux- stable, Raviteja Narayanam, Shubhrajyoti Datta,
Greg Kroah-Hartman, linux-serial, Linux ARM
On Fri, 18 Sep 2020 at 07:51, Sasha Levin <sashal@kernel.org> wrote:
>
> From: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
>
> [ Upstream commit 42e11948ddf68b9f799cad8c0ddeab0a39da33e8 ]
>
> On some platforms, the log is corrupted while console is being
> registered. It is observed that when set_termios is called, there
> are still some bytes in the FIFO to be transmitted.
>
> So, wait for tx_empty inside cdns_uart_console_setup before calling
> set_termios.
>
> Signed-off-by: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
> Reviewed-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
> Link: https://lore.kernel.org/r/1586413563-29125-2-git-send-email-raviteja.narayanam@xilinx.com
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
stable rc branch 4.4 arm64 build broken.
../drivers/tty/serial/xilinx_uartps.c: In function ‘cdns_uart_console_setup’:
../drivers/tty/serial/xilinx_uartps.c:1170:40: error: ‘TX_TIMEOUT’
undeclared (first use in this function)
1170 | time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT);
^~~~~~~~~~
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
> ---
> drivers/tty/serial/xilinx_uartps.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
> index 06efcef1b4953..5b4469098888a 100644
> --- a/drivers/tty/serial/xilinx_uartps.c
> +++ b/drivers/tty/serial/xilinx_uartps.c
> @@ -1152,6 +1152,7 @@ static int cdns_uart_console_setup(struct console *co, char *options)
> int bits = 8;
> int parity = 'n';
> int flow = 'n';
> + unsigned long time_out;
>
> if (co->index < 0 || co->index >= CDNS_UART_NR_PORTS)
> return -EINVAL;
> @@ -1165,6 +1166,13 @@ static int cdns_uart_console_setup(struct console *co, char *options)
> if (options)
> uart_parse_options(options, &baud, &parity, &bits, &flow);
>
> + /* Wait for tx_empty before setting up the console */
> + time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT);
> +
> + while (time_before(jiffies, time_out) &&
> + cdns_uart_tx_empty(port) != TIOCSER_TEMT)
> + cpu_relax();
> +
> return uart_set_options(port, co, baud, parity, bits, flow);
> }
>
> --
> 2.25.1
>
--
Linaro LKFT
https://lkft.linaro.org
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH AUTOSEL 4.4 42/64] serial: uartps: Wait for tx_empty in console setup
2020-09-28 20:16 ` Naresh Kamboju
@ 2020-09-28 22:00 ` Sasha Levin
0 siblings, 0 replies; 5+ messages in thread
From: Sasha Levin @ 2020-09-28 22:00 UTC (permalink / raw)
To: Naresh Kamboju
Cc: open list, linux- stable, Raviteja Narayanam, Shubhrajyoti Datta,
Greg Kroah-Hartman, linux-serial, Linux ARM
On Tue, Sep 29, 2020 at 01:46:59AM +0530, Naresh Kamboju wrote:
>On Fri, 18 Sep 2020 at 07:51, Sasha Levin <sashal@kernel.org> wrote:
>>
>> From: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
>>
>> [ Upstream commit 42e11948ddf68b9f799cad8c0ddeab0a39da33e8 ]
>>
>> On some platforms, the log is corrupted while console is being
>> registered. It is observed that when set_termios is called, there
>> are still some bytes in the FIFO to be transmitted.
>>
>> So, wait for tx_empty inside cdns_uart_console_setup before calling
>> set_termios.
>>
>> Signed-off-by: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
>> Reviewed-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
>> Link: https://lore.kernel.org/r/1586413563-29125-2-git-send-email-raviteja.narayanam@xilinx.com
>> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> Signed-off-by: Sasha Levin <sashal@kernel.org>
>
>stable rc branch 4.4 arm64 build broken.
>
>../drivers/tty/serial/xilinx_uartps.c: In function ‘cdns_uart_console_setup’:
>../drivers/tty/serial/xilinx_uartps.c:1170:40: error: ‘TX_TIMEOUT’
>undeclared (first use in this function)
> 1170 | time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT);
> ^~~~~~~~~~
>Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Dropped, thanks!
--
Thanks,
Sasha
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH AUTOSEL 4.4 51/64] tty: serial: samsung: Correct clock selection logic
[not found] <20200918021643.2067895-1-sashal@kernel.org>
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 36/64] serial: 8250_omap: Fix sleeping function called from invalid context during probe Sasha Levin
2020-09-18 2:16 ` [PATCH AUTOSEL 4.4 42/64] serial: uartps: Wait for tx_empty in console setup Sasha Levin
@ 2020-09-18 2:16 ` Sasha Levin
2 siblings, 0 replies; 5+ messages in thread
From: Sasha Levin @ 2020-09-18 2:16 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Jonathan Bakker, Krzysztof Kozlowski, Greg Kroah-Hartman,
Sasha Levin, linux-serial
From: Jonathan Bakker <xc-racer2@live.ca>
[ Upstream commit 7d31676a8d91dd18e08853efd1cb26961a38c6a6 ]
Some variants of the samsung tty driver can pick which clock
to use for their baud rate generation. In the DT conversion,
a default clock was selected to be used if a specific one wasn't
assigned and then a comparison of which clock rate worked better
was done. Unfortunately, the comparison was implemented in such
a way that only the default clock was ever actually compared.
Fix this by iterating through all possible clocks, except when a
specific clock has already been picked via clk_sel (which is
only possible via board files).
Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/BN6PR04MB06604E63833EA41837EBF77BA3A30@BN6PR04MB0660.namprd04.prod.outlook.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/tty/serial/samsung.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 70a51d0bc6044..42aa37515e9bd 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -1151,14 +1151,14 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
struct s3c24xx_uart_info *info = ourport->info;
struct clk *clk;
unsigned long rate;
- unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
+ unsigned int cnt, baud, quot, best_quot = 0;
char clkname[MAX_CLK_NAME_LENGTH];
int calc_deviation, deviation = (1 << 30) - 1;
- clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
- ourport->info->def_clk_sel;
for (cnt = 0; cnt < info->num_clks; cnt++) {
- if (!(clk_sel & (1 << cnt)))
+ /* Keep selected clock if provided */
+ if (ourport->cfg->clk_sel &&
+ !(ourport->cfg->clk_sel & (1 << cnt)))
continue;
sprintf(clkname, "clk_uart_baud%d", cnt);
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread