* [PATCH] net: stmmac: Delete txtimer in suspend()
@ 2020-02-01 2:01 Nicolin Chen
2020-02-03 23:04 ` Jakub Kicinski
0 siblings, 1 reply; 2+ messages in thread
From: Nicolin Chen @ 2020-02-01 2:01 UTC (permalink / raw)
To: davem, peppe.cavallaro, alexandre.torgue, joabreu
Cc: mcoquelin.stm32, netdev, linux-stm32, linux-arm-kernel, linux-kernel
When running v5.5 with a rootfs on NFS, memory abort may happen in
the system resume stage:
Unable to handle kernel paging request at virtual address dead00000000012a
[dead00000000012a] address between user and kernel address ranges
pc : run_timer_softirq+0x334/0x3d8
lr : run_timer_softirq+0x244/0x3d8
x1 : ffff800011cafe80 x0 : dead000000000122
Call trace:
run_timer_softirq+0x334/0x3d8
efi_header_end+0x114/0x234
irq_exit+0xd0/0xd8
__handle_domain_irq+0x60/0xb0
gic_handle_irq+0x58/0xa8
el1_irq+0xb8/0x180
arch_cpu_idle+0x10/0x18
do_idle+0x1d8/0x2b0
cpu_startup_entry+0x24/0x40
secondary_start_kernel+0x1b4/0x208
Code: f9000693 a9400660 f9000020 b4000040 (f9000401)
---[ end trace bb83ceeb4c482071 ]---
Kernel panic - not syncing: Fatal exception in interrupt
SMP: stopping secondary CPUs
SMP: failed to stop secondary CPUs 2-3
Kernel Offset: disabled
CPU features: 0x00002,2300aa30
Memory Limit: none
---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
It's found that stmmac_xmit() and stmmac_resume() sometimes might
run concurrently, possibly resulting in a race condition between
mod_timer() and setup_timer(), being called by stmmac_xmit() and
stmmac_resume() respectively.
Since the resume() runs setup_timer() every time, it'd be safer to
have del_timer_sync() in the suspend() as the counterpart.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index ff1cbfc834b0..5836b21edd7e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4974,6 +4974,7 @@ int stmmac_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct stmmac_priv *priv = netdev_priv(ndev);
+ u32 chan;
if (!ndev || !netif_running(ndev))
return 0;
@@ -4987,6 +4988,9 @@ int stmmac_suspend(struct device *dev)
stmmac_disable_all_queues(priv);
+ for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
+ del_timer_sync(&priv->tx_queue[chan].txtimer);
+
/* Stop TX/RX DMA */
stmmac_stop_all_dma(priv);
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] net: stmmac: Delete txtimer in suspend()
2020-02-01 2:01 [PATCH] net: stmmac: Delete txtimer in suspend() Nicolin Chen
@ 2020-02-03 23:04 ` Jakub Kicinski
0 siblings, 0 replies; 2+ messages in thread
From: Jakub Kicinski @ 2020-02-03 23:04 UTC (permalink / raw)
To: Nicolin Chen
Cc: davem, peppe.cavallaro, alexandre.torgue, joabreu,
mcoquelin.stm32, netdev, linux-stm32, linux-arm-kernel,
linux-kernel
On Fri, 31 Jan 2020 18:01:24 -0800, Nicolin Chen wrote:
> When running v5.5 with a rootfs on NFS, memory abort may happen in
> the system resume stage:
> Unable to handle kernel paging request at virtual address dead00000000012a
> [dead00000000012a] address between user and kernel address ranges
> pc : run_timer_softirq+0x334/0x3d8
> lr : run_timer_softirq+0x244/0x3d8
> x1 : ffff800011cafe80 x0 : dead000000000122
> Call trace:
> run_timer_softirq+0x334/0x3d8
> efi_header_end+0x114/0x234
> irq_exit+0xd0/0xd8
> __handle_domain_irq+0x60/0xb0
> gic_handle_irq+0x58/0xa8
> el1_irq+0xb8/0x180
> arch_cpu_idle+0x10/0x18
> do_idle+0x1d8/0x2b0
> cpu_startup_entry+0x24/0x40
> secondary_start_kernel+0x1b4/0x208
> Code: f9000693 a9400660 f9000020 b4000040 (f9000401)
> ---[ end trace bb83ceeb4c482071 ]---
> Kernel panic - not syncing: Fatal exception in interrupt
> SMP: stopping secondary CPUs
> SMP: failed to stop secondary CPUs 2-3
> Kernel Offset: disabled
> CPU features: 0x00002,2300aa30
> Memory Limit: none
> ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
>
> It's found that stmmac_xmit() and stmmac_resume() sometimes might
> run concurrently, possibly resulting in a race condition between
> mod_timer() and setup_timer(), being called by stmmac_xmit() and
> stmmac_resume() respectively.
>
> Since the resume() runs setup_timer() every time, it'd be safer to
> have del_timer_sync() in the suspend() as the counterpart.
>
> Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Applied, and queued for stable, thank you!
^ permalink raw reply [flat|nested] 2+ messages in thread
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