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authorThomas Körper <thomas.koerper@esd.eu>2014-10-31 07:33:54 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-12-06 15:05:49 -0800
commit6e5837921cf4416edadae6ff6add38917175ac8e (patch)
treee4f3973c4e5498e3f8154193c5ead8007c70ceee
parent9c661315b77e219bc44b67c77567bf7833ff900c (diff)
downloadlinux-linaro-stable-6e5837921cf4416edadae6ff6add38917175ac8e.tar.gz
can: dev: avoid calling kfree_skb() from interrupt context
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@esd.eu> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/can/dev.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 539239d8e9ab..9bf47a064cdf 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -385,7 +385,7 @@ void can_free_echo_skb(struct net_device *dev, unsigned int idx)
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;
}
}