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* [PATCH] rtlwifi: pci: use dev_kfree_skb_irq instead of kfree_skb in rtl_pci_reset_trx_ring
@ 2016-05-05 17:19 ` Wang YanQing
  0 siblings, 0 replies; 5+ messages in thread
From: Wang YanQing @ 2016-05-05 17:19 UTC (permalink / raw)
  To: Larry.Finger; +Cc: chaoming_li, kvalo, linux-wireless, netdev, linux-kernel

We can't use kfree_skb in irq disable context, because spin_lock_irqsave
make sure we are always in irq disable context, use dev_kfree_skb_irq
instead of kfree_skb is better than dev_kfree_skb_any.

This patch fix below kernel warning:
[ 7612.095528] ------------[ cut here ]------------
[ 7612.095546] WARNING: CPU: 3 PID: 4460 at kernel/softirq.c:150 __local_bh_enable_ip+0x58/0x80()
[ 7612.095550] Modules linked in: rtl8723be x86_pkg_temp_thermal btcoexist rtl_pci rtlwifi rtl8723_common
[ 7612.095567] CPU: 3 PID: 4460 Comm: ifconfig Tainted: G        W       4.4.0+ #4
[ 7612.095570] Hardware name: LENOVO 20DFA04FCD/20DFA04FCD, BIOS J5ET48WW (1.19 ) 08/27/2015
[ 7612.095574]  00000000 00000000 da37fc70 c12ce7c5 00000000 da37fca0 c104cc59 c19d4454
[ 7612.095584]  00000003 0000116c c19d4784 00000096 c10508a8 c10508a8 00000200 c1b42400
[ 7612.095594]  f29be780 da37fcb0 c104ccad 00000009 00000000 da37fcbc c10508a8 f21f08b8
[ 7612.095604] Call Trace:
[ 7612.095614]  [<c12ce7c5>] dump_stack+0x41/0x5c
[ 7612.095620]  [<c104cc59>] warn_slowpath_common+0x89/0xc0
[ 7612.095628]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
[ 7612.095634]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
[ 7612.095640]  [<c104ccad>] warn_slowpath_null+0x1d/0x20
[ 7612.095646]  [<c10508a8>] __local_bh_enable_ip+0x58/0x80
[ 7612.095653]  [<c16b7d34>] destroy_conntrack+0x64/0xa0
[ 7612.095660]  [<c16b300f>] nf_conntrack_destroy+0xf/0x20
[ 7612.095665]  [<c1677565>] skb_release_head_state+0x55/0xa0
[ 7612.095670]  [<c16775bb>] skb_release_all+0xb/0x20
[ 7612.095674]  [<c167760b>] __kfree_skb+0xb/0x60
[ 7612.095679]  [<c16776f0>] kfree_skb+0x30/0x70
[ 7612.095686]  [<f81b869d>] ? rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
[ 7612.095692]  [<f81b869d>] rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
[ 7612.095698]  [<f81b87f9>] rtl_pci_start+0x19/0x190 [rtl_pci]
[ 7612.095705]  [<f81970e6>] rtl_op_start+0x56/0x90 [rtlwifi]
[ 7612.095712]  [<c17e3f16>] drv_start+0x36/0xc0
[ 7612.095717]  [<c17f5ab3>] ieee80211_do_open+0x2d3/0x890
[ 7612.095725]  [<c16820fe>] ? call_netdevice_notifiers_info+0x2e/0x60
[ 7612.095730]  [<c17f60bd>] ieee80211_open+0x4d/0x50
[ 7612.095736]  [<c16891b3>] __dev_open+0xa3/0x130
[ 7612.095742]  [<c183fa53>] ? _raw_spin_unlock_bh+0x13/0x20
[ 7612.095748]  [<c1689499>] __dev_change_flags+0x89/0x140
[ 7612.095753]  [<c127c70d>] ? selinux_capable+0xd/0x10
[ 7612.095759]  [<c1689589>] dev_change_flags+0x29/0x60
[ 7612.095765]  [<c1700b93>] devinet_ioctl+0x553/0x670
[ 7612.095772]  [<c12db758>] ? _copy_to_user+0x28/0x40
[ 7612.095777]  [<c17018b5>] inet_ioctl+0x85/0xb0
[ 7612.095783]  [<c166e647>] sock_ioctl+0x67/0x260
[ 7612.095788]  [<c166e5e0>] ? sock_fasync+0x80/0x80
[ 7612.095795]  [<c115c99b>] do_vfs_ioctl+0x6b/0x550
[ 7612.095800]  [<c127c812>] ? selinux_file_ioctl+0x102/0x1e0
[ 7612.095807]  [<c10a8914>] ? timekeeping_suspend+0x294/0x320
[ 7612.095813]  [<c10a256a>] ? __hrtimer_run_queues+0x14a/0x210
[ 7612.095820]  [<c1276e24>] ? security_file_ioctl+0x34/0x50
[ 7612.095827]  [<c115cef0>] SyS_ioctl+0x70/0x80
[ 7612.095832]  [<c1001804>] do_fast_syscall_32+0x84/0x120
[ 7612.095839]  [<c183ff91>] sysenter_past_esp+0x36/0x55
[ 7612.095844] ---[ end trace 97e9c637a20e8348 ]---

Signed-off-by: Wang YanQing <udknight@gmail.com>
---
 drivers/net/wireless/realtek/rtlwifi/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
index 1ac41b8..99a3a03 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -1572,7 +1572,7 @@ int rtl_pci_reset_trx_ring(struct ieee80211_hw *hw)
 							 true,
 							 HW_DESC_TXBUFF_ADDR),
 						 skb->len, PCI_DMA_TODEVICE);
-				kfree_skb(skb);
+				dev_kfree_skb_irq(skb);
 				ring->idx = (ring->idx + 1) % ring->entries;
 			}
 			ring->idx = 0;
-- 
1.8.5.6.2.g3d8a54e.dirty

^ permalink raw reply related	[flat|nested] 5+ messages in thread
* [PATCH] rtlwifi: pci: use dev_kfree_skb_irq instead of kfree_skb in rtl_pci_reset_trx_ring
@ 2016-05-05 17:19 ` Wang YanQing
  0 siblings, 0 replies; 5+ messages in thread
From: Wang YanQing @ 2016-05-05 17:19 UTC (permalink / raw)
  To: Larry.Finger-tQ5ms3gMjBLk1uMJSBkQmQ
  Cc: chaoming_li-kXabqFNEczNtrwSWzY7KCg, kvalo-sgV2jX0FEOL9JmXXK+q4OQ,
	linux-wireless-u79uwXL29TY76Z2rM5mHXA,
	netdev-u79uwXL29TY76Z2rM5mHXA,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA

We can't use kfree_skb in irq disable context, because spin_lock_irqsave
make sure we are always in irq disable context, use dev_kfree_skb_irq
instead of kfree_skb is better than dev_kfree_skb_any.

This patch fix below kernel warning:
[ 7612.095528] ------------[ cut here ]------------
[ 7612.095546] WARNING: CPU: 3 PID: 4460 at kernel/softirq.c:150 __local_bh_enable_ip+0x58/0x80()
[ 7612.095550] Modules linked in: rtl8723be x86_pkg_temp_thermal btcoexist rtl_pci rtlwifi rtl8723_common
[ 7612.095567] CPU: 3 PID: 4460 Comm: ifconfig Tainted: G        W       4.4.0+ #4
[ 7612.095570] Hardware name: LENOVO 20DFA04FCD/20DFA04FCD, BIOS J5ET48WW (1.19 ) 08/27/2015
[ 7612.095574]  00000000 00000000 da37fc70 c12ce7c5 00000000 da37fca0 c104cc59 c19d4454
[ 7612.095584]  00000003 0000116c c19d4784 00000096 c10508a8 c10508a8 00000200 c1b42400
[ 7612.095594]  f29be780 da37fcb0 c104ccad 00000009 00000000 da37fcbc c10508a8 f21f08b8
[ 7612.095604] Call Trace:
[ 7612.095614]  [<c12ce7c5>] dump_stack+0x41/0x5c
[ 7612.095620]  [<c104cc59>] warn_slowpath_common+0x89/0xc0
[ 7612.095628]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
[ 7612.095634]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
[ 7612.095640]  [<c104ccad>] warn_slowpath_null+0x1d/0x20
[ 7612.095646]  [<c10508a8>] __local_bh_enable_ip+0x58/0x80
[ 7612.095653]  [<c16b7d34>] destroy_conntrack+0x64/0xa0
[ 7612.095660]  [<c16b300f>] nf_conntrack_destroy+0xf/0x20
[ 7612.095665]  [<c1677565>] skb_release_head_state+0x55/0xa0
[ 7612.095670]  [<c16775bb>] skb_release_all+0xb/0x20
[ 7612.095674]  [<c167760b>] __kfree_skb+0xb/0x60
[ 7612.095679]  [<c16776f0>] kfree_skb+0x30/0x70
[ 7612.095686]  [<f81b869d>] ? rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
[ 7612.095692]  [<f81b869d>] rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
[ 7612.095698]  [<f81b87f9>] rtl_pci_start+0x19/0x190 [rtl_pci]
[ 7612.095705]  [<f81970e6>] rtl_op_start+0x56/0x90 [rtlwifi]
[ 7612.095712]  [<c17e3f16>] drv_start+0x36/0xc0
[ 7612.095717]  [<c17f5ab3>] ieee80211_do_open+0x2d3/0x890
[ 7612.095725]  [<c16820fe>] ? call_netdevice_notifiers_info+0x2e/0x60
[ 7612.095730]  [<c17f60bd>] ieee80211_open+0x4d/0x50
[ 7612.095736]  [<c16891b3>] __dev_open+0xa3/0x130
[ 7612.095742]  [<c183fa53>] ? _raw_spin_unlock_bh+0x13/0x20
[ 7612.095748]  [<c1689499>] __dev_change_flags+0x89/0x140
[ 7612.095753]  [<c127c70d>] ? selinux_capable+0xd/0x10
[ 7612.095759]  [<c1689589>] dev_change_flags+0x29/0x60
[ 7612.095765]  [<c1700b93>] devinet_ioctl+0x553/0x670
[ 7612.095772]  [<c12db758>] ? _copy_to_user+0x28/0x40
[ 7612.095777]  [<c17018b5>] inet_ioctl+0x85/0xb0
[ 7612.095783]  [<c166e647>] sock_ioctl+0x67/0x260
[ 7612.095788]  [<c166e5e0>] ? sock_fasync+0x80/0x80
[ 7612.095795]  [<c115c99b>] do_vfs_ioctl+0x6b/0x550
[ 7612.095800]  [<c127c812>] ? selinux_file_ioctl+0x102/0x1e0
[ 7612.095807]  [<c10a8914>] ? timekeeping_suspend+0x294/0x320
[ 7612.095813]  [<c10a256a>] ? __hrtimer_run_queues+0x14a/0x210
[ 7612.095820]  [<c1276e24>] ? security_file_ioctl+0x34/0x50
[ 7612.095827]  [<c115cef0>] SyS_ioctl+0x70/0x80
[ 7612.095832]  [<c1001804>] do_fast_syscall_32+0x84/0x120
[ 7612.095839]  [<c183ff91>] sysenter_past_esp+0x36/0x55
[ 7612.095844] ---[ end trace 97e9c637a20e8348 ]---

Signed-off-by: Wang YanQing <udknight-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/net/wireless/realtek/rtlwifi/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
index 1ac41b8..99a3a03 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -1572,7 +1572,7 @@ int rtl_pci_reset_trx_ring(struct ieee80211_hw *hw)
 							 true,
 							 HW_DESC_TXBUFF_ADDR),
 						 skb->len, PCI_DMA_TODEVICE);
-				kfree_skb(skb);
+				dev_kfree_skb_irq(skb);
 				ring->idx = (ring->idx + 1) % ring->entries;
 			}
 			ring->idx = 0;
-- 
1.8.5.6.2.g3d8a54e.dirty
--
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^ permalink raw reply related	[flat|nested] 5+ messages in thread
* Re: [PATCH] rtlwifi: pci: use dev_kfree_skb_irq instead of kfree_skb in rtl_pci_reset_trx_ring
  2016-05-05 17:19 ` Wang YanQing
@ 2016-05-05 19:25   ` Larry Finger
  -1 siblings, 0 replies; 5+ messages in thread
From: Larry Finger @ 2016-05-05 19:25 UTC (permalink / raw)
  To: Wang YanQing, chaoming_li, kvalo, linux-wireless, netdev, linux-kernel

On 05/05/2016 12:19 PM, Wang YanQing wrote:
> We can't use kfree_skb in irq disable context, because spin_lock_irqsave
> make sure we are always in irq disable context, use dev_kfree_skb_irq
> instead of kfree_skb is better than dev_kfree_skb_any.
>
> This patch fix below kernel warning:
> [ 7612.095528] ------------[ cut here ]------------
> [ 7612.095546] WARNING: CPU: 3 PID: 4460 at kernel/softirq.c:150 __local_bh_enable_ip+0x58/0x80()
> [ 7612.095550] Modules linked in: rtl8723be x86_pkg_temp_thermal btcoexist rtl_pci rtlwifi rtl8723_common
> [ 7612.095567] CPU: 3 PID: 4460 Comm: ifconfig Tainted: G        W       4.4.0+ #4
> [ 7612.095570] Hardware name: LENOVO 20DFA04FCD/20DFA04FCD, BIOS J5ET48WW (1.19 ) 08/27/2015
> [ 7612.095574]  00000000 00000000 da37fc70 c12ce7c5 00000000 da37fca0 c104cc59 c19d4454
> [ 7612.095584]  00000003 0000116c c19d4784 00000096 c10508a8 c10508a8 00000200 c1b42400
> [ 7612.095594]  f29be780 da37fcb0 c104ccad 00000009 00000000 da37fcbc c10508a8 f21f08b8
> [ 7612.095604] Call Trace:
> [ 7612.095614]  [<c12ce7c5>] dump_stack+0x41/0x5c
> [ 7612.095620]  [<c104cc59>] warn_slowpath_common+0x89/0xc0
> [ 7612.095628]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
> [ 7612.095634]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
> [ 7612.095640]  [<c104ccad>] warn_slowpath_null+0x1d/0x20
> [ 7612.095646]  [<c10508a8>] __local_bh_enable_ip+0x58/0x80
> [ 7612.095653]  [<c16b7d34>] destroy_conntrack+0x64/0xa0
> [ 7612.095660]  [<c16b300f>] nf_conntrack_destroy+0xf/0x20
> [ 7612.095665]  [<c1677565>] skb_release_head_state+0x55/0xa0
> [ 7612.095670]  [<c16775bb>] skb_release_all+0xb/0x20
> [ 7612.095674]  [<c167760b>] __kfree_skb+0xb/0x60
> [ 7612.095679]  [<c16776f0>] kfree_skb+0x30/0x70
> [ 7612.095686]  [<f81b869d>] ? rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
> [ 7612.095692]  [<f81b869d>] rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
> [ 7612.095698]  [<f81b87f9>] rtl_pci_start+0x19/0x190 [rtl_pci]
> [ 7612.095705]  [<f81970e6>] rtl_op_start+0x56/0x90 [rtlwifi]
> [ 7612.095712]  [<c17e3f16>] drv_start+0x36/0xc0
> [ 7612.095717]  [<c17f5ab3>] ieee80211_do_open+0x2d3/0x890
> [ 7612.095725]  [<c16820fe>] ? call_netdevice_notifiers_info+0x2e/0x60
> [ 7612.095730]  [<c17f60bd>] ieee80211_open+0x4d/0x50
> [ 7612.095736]  [<c16891b3>] __dev_open+0xa3/0x130
> [ 7612.095742]  [<c183fa53>] ? _raw_spin_unlock_bh+0x13/0x20
> [ 7612.095748]  [<c1689499>] __dev_change_flags+0x89/0x140
> [ 7612.095753]  [<c127c70d>] ? selinux_capable+0xd/0x10
> [ 7612.095759]  [<c1689589>] dev_change_flags+0x29/0x60
> [ 7612.095765]  [<c1700b93>] devinet_ioctl+0x553/0x670
> [ 7612.095772]  [<c12db758>] ? _copy_to_user+0x28/0x40
> [ 7612.095777]  [<c17018b5>] inet_ioctl+0x85/0xb0
> [ 7612.095783]  [<c166e647>] sock_ioctl+0x67/0x260
> [ 7612.095788]  [<c166e5e0>] ? sock_fasync+0x80/0x80
> [ 7612.095795]  [<c115c99b>] do_vfs_ioctl+0x6b/0x550
> [ 7612.095800]  [<c127c812>] ? selinux_file_ioctl+0x102/0x1e0
> [ 7612.095807]  [<c10a8914>] ? timekeeping_suspend+0x294/0x320
> [ 7612.095813]  [<c10a256a>] ? __hrtimer_run_queues+0x14a/0x210
> [ 7612.095820]  [<c1276e24>] ? security_file_ioctl+0x34/0x50
> [ 7612.095827]  [<c115cef0>] SyS_ioctl+0x70/0x80
> [ 7612.095832]  [<c1001804>] do_fast_syscall_32+0x84/0x120
> [ 7612.095839]  [<c183ff91>] sysenter_past_esp+0x36/0x55
> [ 7612.095844] ---[ end trace 97e9c637a20e8348 ]---
>
> Signed-off-by: Wang YanQing <udknight@gmail.com>
> ---
>   drivers/net/wireless/realtek/rtlwifi/pci.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
> index 1ac41b8..99a3a03 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/pci.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
> @@ -1572,7 +1572,7 @@ int rtl_pci_reset_trx_ring(struct ieee80211_hw *hw)
>   							 true,
>   							 HW_DESC_TXBUFF_ADDR),
>   						 skb->len, PCI_DMA_TODEVICE);
> -				kfree_skb(skb);
> +				dev_kfree_skb_irq(skb);
>   				ring->idx = (ring->idx + 1) % ring->entries;
>   			}
>   			ring->idx = 0;
>

I am currently testing this patch. It looks OK, but during my first test, I got 
a system crash that was not captured. As I was testing some other things, your 
patch may not have been at fault and I am now testing with only that one change.

By the way, I have never seen the warning that you posted. I always use 64-bit 
Linux, and that may be the difference.

Once I finish my testing, I will ack or nack.

Larry


^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: [PATCH] rtlwifi: pci: use dev_kfree_skb_irq instead of kfree_skb in rtl_pci_reset_trx_ring
@ 2016-05-05 19:25   ` Larry Finger
  0 siblings, 0 replies; 5+ messages in thread
From: Larry Finger @ 2016-05-05 19:25 UTC (permalink / raw)
  To: Wang YanQing, chaoming_li-kXabqFNEczNtrwSWzY7KCg,
	kvalo-sgV2jX0FEOL9JmXXK+q4OQ,
	linux-wireless-u79uwXL29TY76Z2rM5mHXA,
	netdev-u79uwXL29TY76Z2rM5mHXA,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA

On 05/05/2016 12:19 PM, Wang YanQing wrote:
> We can't use kfree_skb in irq disable context, because spin_lock_irqsave
> make sure we are always in irq disable context, use dev_kfree_skb_irq
> instead of kfree_skb is better than dev_kfree_skb_any.
>
> This patch fix below kernel warning:
> [ 7612.095528] ------------[ cut here ]------------
> [ 7612.095546] WARNING: CPU: 3 PID: 4460 at kernel/softirq.c:150 __local_bh_enable_ip+0x58/0x80()
> [ 7612.095550] Modules linked in: rtl8723be x86_pkg_temp_thermal btcoexist rtl_pci rtlwifi rtl8723_common
> [ 7612.095567] CPU: 3 PID: 4460 Comm: ifconfig Tainted: G        W       4.4.0+ #4
> [ 7612.095570] Hardware name: LENOVO 20DFA04FCD/20DFA04FCD, BIOS J5ET48WW (1.19 ) 08/27/2015
> [ 7612.095574]  00000000 00000000 da37fc70 c12ce7c5 00000000 da37fca0 c104cc59 c19d4454
> [ 7612.095584]  00000003 0000116c c19d4784 00000096 c10508a8 c10508a8 00000200 c1b42400
> [ 7612.095594]  f29be780 da37fcb0 c104ccad 00000009 00000000 da37fcbc c10508a8 f21f08b8
> [ 7612.095604] Call Trace:
> [ 7612.095614]  [<c12ce7c5>] dump_stack+0x41/0x5c
> [ 7612.095620]  [<c104cc59>] warn_slowpath_common+0x89/0xc0
> [ 7612.095628]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
> [ 7612.095634]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
> [ 7612.095640]  [<c104ccad>] warn_slowpath_null+0x1d/0x20
> [ 7612.095646]  [<c10508a8>] __local_bh_enable_ip+0x58/0x80
> [ 7612.095653]  [<c16b7d34>] destroy_conntrack+0x64/0xa0
> [ 7612.095660]  [<c16b300f>] nf_conntrack_destroy+0xf/0x20
> [ 7612.095665]  [<c1677565>] skb_release_head_state+0x55/0xa0
> [ 7612.095670]  [<c16775bb>] skb_release_all+0xb/0x20
> [ 7612.095674]  [<c167760b>] __kfree_skb+0xb/0x60
> [ 7612.095679]  [<c16776f0>] kfree_skb+0x30/0x70
> [ 7612.095686]  [<f81b869d>] ? rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
> [ 7612.095692]  [<f81b869d>] rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
> [ 7612.095698]  [<f81b87f9>] rtl_pci_start+0x19/0x190 [rtl_pci]
> [ 7612.095705]  [<f81970e6>] rtl_op_start+0x56/0x90 [rtlwifi]
> [ 7612.095712]  [<c17e3f16>] drv_start+0x36/0xc0
> [ 7612.095717]  [<c17f5ab3>] ieee80211_do_open+0x2d3/0x890
> [ 7612.095725]  [<c16820fe>] ? call_netdevice_notifiers_info+0x2e/0x60
> [ 7612.095730]  [<c17f60bd>] ieee80211_open+0x4d/0x50
> [ 7612.095736]  [<c16891b3>] __dev_open+0xa3/0x130
> [ 7612.095742]  [<c183fa53>] ? _raw_spin_unlock_bh+0x13/0x20
> [ 7612.095748]  [<c1689499>] __dev_change_flags+0x89/0x140
> [ 7612.095753]  [<c127c70d>] ? selinux_capable+0xd/0x10
> [ 7612.095759]  [<c1689589>] dev_change_flags+0x29/0x60
> [ 7612.095765]  [<c1700b93>] devinet_ioctl+0x553/0x670
> [ 7612.095772]  [<c12db758>] ? _copy_to_user+0x28/0x40
> [ 7612.095777]  [<c17018b5>] inet_ioctl+0x85/0xb0
> [ 7612.095783]  [<c166e647>] sock_ioctl+0x67/0x260
> [ 7612.095788]  [<c166e5e0>] ? sock_fasync+0x80/0x80
> [ 7612.095795]  [<c115c99b>] do_vfs_ioctl+0x6b/0x550
> [ 7612.095800]  [<c127c812>] ? selinux_file_ioctl+0x102/0x1e0
> [ 7612.095807]  [<c10a8914>] ? timekeeping_suspend+0x294/0x320
> [ 7612.095813]  [<c10a256a>] ? __hrtimer_run_queues+0x14a/0x210
> [ 7612.095820]  [<c1276e24>] ? security_file_ioctl+0x34/0x50
> [ 7612.095827]  [<c115cef0>] SyS_ioctl+0x70/0x80
> [ 7612.095832]  [<c1001804>] do_fast_syscall_32+0x84/0x120
> [ 7612.095839]  [<c183ff91>] sysenter_past_esp+0x36/0x55
> [ 7612.095844] ---[ end trace 97e9c637a20e8348 ]---
>
> Signed-off-by: Wang YanQing <udknight-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>   drivers/net/wireless/realtek/rtlwifi/pci.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
> index 1ac41b8..99a3a03 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/pci.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
> @@ -1572,7 +1572,7 @@ int rtl_pci_reset_trx_ring(struct ieee80211_hw *hw)
>   							 true,
>   							 HW_DESC_TXBUFF_ADDR),
>   						 skb->len, PCI_DMA_TODEVICE);
> -				kfree_skb(skb);
> +				dev_kfree_skb_irq(skb);
>   				ring->idx = (ring->idx + 1) % ring->entries;
>   			}
>   			ring->idx = 0;
>

I am currently testing this patch. It looks OK, but during my first test, I got 
a system crash that was not captured. As I was testing some other things, your 
patch may not have been at fault and I am now testing with only that one change.

By the way, I have never seen the warning that you posted. I always use 64-bit 
Linux, and that may be the difference.

Once I finish my testing, I will ack or nack.

Larry

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^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: [PATCH] rtlwifi: pci: use dev_kfree_skb_irq instead of kfree_skb in rtl_pci_reset_trx_ring
  2016-05-05 17:19 ` Wang YanQing
  (?)
  (?)
@ 2016-05-06 16:12 ` Larry Finger
  -1 siblings, 0 replies; 5+ messages in thread
From: Larry Finger @ 2016-05-06 16:12 UTC (permalink / raw)
  To: Wang YanQing, chaoming_li, kvalo, linux-wireless, netdev, linux-kernel

On 05/05/2016 12:19 PM, Wang YanQing wrote:
> We can't use kfree_skb in irq disable context, because spin_lock_irqsave
> make sure we are always in irq disable context, use dev_kfree_skb_irq
> instead of kfree_skb is better than dev_kfree_skb_any.
>
> This patch fix below kernel warning:
> [ 7612.095528] ------------[ cut here ]------------
> [ 7612.095546] WARNING: CPU: 3 PID: 4460 at kernel/softirq.c:150 __local_bh_enable_ip+0x58/0x80()
> [ 7612.095550] Modules linked in: rtl8723be x86_pkg_temp_thermal btcoexist rtl_pci rtlwifi rtl8723_common
> [ 7612.095567] CPU: 3 PID: 4460 Comm: ifconfig Tainted: G        W       4.4.0+ #4
> [ 7612.095570] Hardware name: LENOVO 20DFA04FCD/20DFA04FCD, BIOS J5ET48WW (1.19 ) 08/27/2015
> [ 7612.095574]  00000000 00000000 da37fc70 c12ce7c5 00000000 da37fca0 c104cc59 c19d4454
> [ 7612.095584]  00000003 0000116c c19d4784 00000096 c10508a8 c10508a8 00000200 c1b42400
> [ 7612.095594]  f29be780 da37fcb0 c104ccad 00000009 00000000 da37fcbc c10508a8 f21f08b8
> [ 7612.095604] Call Trace:
> [ 7612.095614]  [<c12ce7c5>] dump_stack+0x41/0x5c
> [ 7612.095620]  [<c104cc59>] warn_slowpath_common+0x89/0xc0
> [ 7612.095628]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
> [ 7612.095634]  [<c10508a8>] ? __local_bh_enable_ip+0x58/0x80
> [ 7612.095640]  [<c104ccad>] warn_slowpath_null+0x1d/0x20
> [ 7612.095646]  [<c10508a8>] __local_bh_enable_ip+0x58/0x80
> [ 7612.095653]  [<c16b7d34>] destroy_conntrack+0x64/0xa0
> [ 7612.095660]  [<c16b300f>] nf_conntrack_destroy+0xf/0x20
> [ 7612.095665]  [<c1677565>] skb_release_head_state+0x55/0xa0
> [ 7612.095670]  [<c16775bb>] skb_release_all+0xb/0x20
> [ 7612.095674]  [<c167760b>] __kfree_skb+0xb/0x60
> [ 7612.095679]  [<c16776f0>] kfree_skb+0x30/0x70
> [ 7612.095686]  [<f81b869d>] ? rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
> [ 7612.095692]  [<f81b869d>] rtl_pci_reset_trx_ring+0x22d/0x370 [rtl_pci]
> [ 7612.095698]  [<f81b87f9>] rtl_pci_start+0x19/0x190 [rtl_pci]
> [ 7612.095705]  [<f81970e6>] rtl_op_start+0x56/0x90 [rtlwifi]
> [ 7612.095712]  [<c17e3f16>] drv_start+0x36/0xc0
> [ 7612.095717]  [<c17f5ab3>] ieee80211_do_open+0x2d3/0x890
> [ 7612.095725]  [<c16820fe>] ? call_netdevice_notifiers_info+0x2e/0x60
> [ 7612.095730]  [<c17f60bd>] ieee80211_open+0x4d/0x50
> [ 7612.095736]  [<c16891b3>] __dev_open+0xa3/0x130
> [ 7612.095742]  [<c183fa53>] ? _raw_spin_unlock_bh+0x13/0x20
> [ 7612.095748]  [<c1689499>] __dev_change_flags+0x89/0x140
> [ 7612.095753]  [<c127c70d>] ? selinux_capable+0xd/0x10
> [ 7612.095759]  [<c1689589>] dev_change_flags+0x29/0x60
> [ 7612.095765]  [<c1700b93>] devinet_ioctl+0x553/0x670
> [ 7612.095772]  [<c12db758>] ? _copy_to_user+0x28/0x40
> [ 7612.095777]  [<c17018b5>] inet_ioctl+0x85/0xb0
> [ 7612.095783]  [<c166e647>] sock_ioctl+0x67/0x260
> [ 7612.095788]  [<c166e5e0>] ? sock_fasync+0x80/0x80
> [ 7612.095795]  [<c115c99b>] do_vfs_ioctl+0x6b/0x550
> [ 7612.095800]  [<c127c812>] ? selinux_file_ioctl+0x102/0x1e0
> [ 7612.095807]  [<c10a8914>] ? timekeeping_suspend+0x294/0x320
> [ 7612.095813]  [<c10a256a>] ? __hrtimer_run_queues+0x14a/0x210
> [ 7612.095820]  [<c1276e24>] ? security_file_ioctl+0x34/0x50
> [ 7612.095827]  [<c115cef0>] SyS_ioctl+0x70/0x80
> [ 7612.095832]  [<c1001804>] do_fast_syscall_32+0x84/0x120
> [ 7612.095839]  [<c183ff91>] sysenter_past_esp+0x36/0x55
> [ 7612.095844] ---[ end trace 97e9c637a20e8348 ]---
>
> Signed-off-by: Wang YanQing <udknight@gmail.com>
> ---
>   drivers/net/wireless/realtek/rtlwifi/pci.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
> index 1ac41b8..99a3a03 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/pci.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
> @@ -1572,7 +1572,7 @@ int rtl_pci_reset_trx_ring(struct ieee80211_hw *hw)
>   							 true,
>   							 HW_DESC_TXBUFF_ADDR),
>   						 skb->len, PCI_DMA_TODEVICE);
> -				kfree_skb(skb);
> +				dev_kfree_skb_irq(skb);
>   				ring->idx = (ring->idx + 1) % ring->entries;
>   			}
>   			ring->idx = 0;

After testing, this patch is OK other than needing a Cc to stable. Please fix 
that and resubmit V2.

Larry



^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-05-06 16:12 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-05-05 17:19 [PATCH] rtlwifi: pci: use dev_kfree_skb_irq instead of kfree_skb in rtl_pci_reset_trx_ring Wang YanQing
2016-05-05 17:19 ` Wang YanQing
2016-05-05 19:25 ` Larry Finger
2016-05-05 19:25   ` Larry Finger
2016-05-06 16:12 ` Larry Finger

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