This is a note to let you know that I've just added the patch titled
can: dev: avoid calling kfree_skb() from interrupt context
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
can-dev-avoid-calling-kfree_skb-from-interrupt-context.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5247a589c24022ab34e780039cc8000c48f2035e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20K=C3=B6rper?= <thomas.koerper@xxxxxx>
Date: Fri, 31 Oct 2014 07:33:54 +0100
Subject: can: dev: avoid calling kfree_skb() from interrupt context
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From: =?UTF-8?q?Thomas=20K=C3=B6rper?= <thomas.koerper@xxxxxx>
commit 5247a589c24022ab34e780039cc8000c48f2035e upstream.
ikfree_skb() is Called in can_free_echo_skb(), which might be called from (TX
Error) interrupt, which triggers the folloing warning:
[ 1153.360705] ------------[ cut here ]------------
[ 1153.360715] WARNING: CPU: 0 PID: 31 at net/core/skbuff.c:563 skb_release_head_state+0xb9/0xd0()
[ 1153.360772] Call Trace:
[ 1153.360778] [<c167906f>] dump_stack+0x41/0x52
[ 1153.360782] [<c105bb7e>] warn_slowpath_common+0x7e/0xa0
[ 1153.360784] [<c158b909>] ? skb_release_head_state+0xb9/0xd0
[ 1153.360786] [<c158b909>] ? skb_release_head_state+0xb9/0xd0
[ 1153.360788] [<c105bc42>] warn_slowpath_null+0x22/0x30
[ 1153.360791] [<c158b909>] skb_release_head_state+0xb9/0xd0
[ 1153.360793] [<c158be90>] skb_release_all+0x10/0x30
[ 1153.360795] [<c158bf06>] kfree_skb+0x36/0x80
[ 1153.360799] [<f8486938>] ? can_free_echo_skb+0x28/0x40 [can_dev]
[ 1153.360802] [<f8486938>] can_free_echo_skb+0x28/0x40 [can_dev]
[ 1153.360805] [<f849a12c>] esd_pci402_interrupt+0x34c/0x57a [esd402]
[ 1153.360809] [<c10a75b5>] handle_irq_event_percpu+0x35/0x180
[ 1153.360811] [<c10a7623>] ? handle_irq_event_percpu+0xa3/0x180
[ 1153.360813] [<c10a7731>] handle_irq_event+0x31/0x50
[ 1153.360816] [<c10a9c7f>] handle_fasteoi_irq+0x6f/0x120
[ 1153.360818] [<c10a9c10>] ? handle_edge_irq+0x110/0x110
[ 1153.360822] [<c1011b61>] handle_irq+0x71/0x90
[ 1153.360823] <IRQ> [<c168152c>] do_IRQ+0x3c/0xd0
[ 1153.360829] [<c1680b6c>] common_interrupt+0x2c/0x34
[ 1153.360834] [<c107d277>] ? finish_task_switch+0x47/0xf0
[ 1153.360836] [<c167c27b>] __schedule+0x35b/0x7e0
[ 1153.360839] [<c10a5334>] ? console_unlock+0x2c4/0x4d0
[ 1153.360842] [<c13df500>] ? n_tty_receive_buf_common+0x890/0x890
[ 1153.360845] [<c10707b6>] ? process_one_work+0x196/0x370
[ 1153.360847] [<c167c723>] schedule+0x23/0x60
[ 1153.360849] [<c1070de1>] worker_thread+0x161/0x460
[ 1153.360852] [<c1090fcf>] ? __wake_up_locked+0x1f/0x30
[ 1153.360854] [<c1070c80>] ? rescuer_thread+0x2f0/0x2f0
[ 1153.360856] [<c1074f01>] kthread+0xa1/0xc0
[ 1153.360859] [<c1680401>] ret_from_kernel_thread+0x21/0x30
[ 1153.360861] [<c1074e60>] ? kthread_create_on_node+0x110/0x110
[ 1153.360863] ---[ end trace 5ff83639cbb74b35 ]---
This patch replaces the kfree_skb() by dev_kfree_skb_any().
Signed-off-by: Thomas Körper <thomas.koerper@xxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/dev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -384,7 +384,7 @@ void can_free_echo_skb(struct net_device
BUG_ON(idx >= priv->echo_skb_max);
if (priv->echo_skb[idx]) {
- kfree_skb(priv->echo_skb[idx]);
+ dev_kfree_skb_any(priv->echo_skb[idx]);
priv->echo_skb[idx] = NULL;
}
}
Patches currently in stable-queue which might be from thomas.koerper@xxxxxx are
queue-3.14/can-dev-avoid-calling-kfree_skb-from-interrupt-context.patch
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