diff options
| author |   Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2009-06-12 21:37:31 +0200 |
|---|---|---|
| committer |   John W. Linville <linville@tuxdriver.com> | 2009-06-15 15:05:52 -0400 |
| commit | 87e501b351ed9d837e63f6506b7e66331a69ed58 (patch) | |
| tree | 7dad95c4413bff47f6f7de41b1e656d989157a47 /drivers/net/wireless | |
| parent | libertas: fix IEEE PS mode in GSPI driver (diff) | |
| download | linux-dev-87e501b351ed9d837e63f6506b7e66331a69ed58.tar.xz linux-dev-87e501b351ed9d837e63f6506b7e66331a69ed58.zip | |
net/libertas: don't recursive spin lock in if_spi_e2h()
|BUG: spinlock recursion on CPU#0, lbs_spi_thread/1030
| lock: dee9a1bc, .magic: dead4ead, .owner: lbs_spi_thread/1030, .owner_cpu: 0
|Call Trace:
|[deec3eb0] [c0007220] show_stack+0x4c/0x15c (unreliable)
|[deec3ef0] [c0187720] spin_bug+0x9c/0xb0
|[deec3f10] [c0187890] _raw_spin_lock+0x54/0x148
|[deec3f40] [c02d260c] _spin_lock_irqsave+0x2c/0x44
|[deec3f60] [e8671800] lbs_queue_event+0x7c/0x130 [libertas]
|[deec3f80] [e8725f04] lbs_spi_thread+0x538/0x58c [libertas_spi]
|[deec3fe0] [c004f270] kthread+0x4c/0x88
|[deec3ff0] [c000f33c] kernel_thread+0x4c/0x68
if_spi_e2h() is grabbing ->driver_lock just while calling
lbs_queue_event() which is grabbing the same lock.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless')
| -rw-r--r-- | drivers/net/wireless/libertas/if_spi.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/net/wireless/libertas/if_spi.c b/drivers/net/wireless/libertas/if_spi.c index dc2a1f6ee36c..923ed58d58e7 100644 --- a/drivers/net/wireless/libertas/if_spi.c +++ b/drivers/net/wireless/libertas/if_spi.c @@ -812,7 +812,6 @@ out: static void if_spi_e2h(struct if_spi_card *card) { int err = 0; - unsigned long flags; u32 cause; struct lbs_private *priv = card->priv; @@ -827,10 +826,7 @@ static void if_spi_e2h(struct if_spi_card *card) /* generate a card interrupt */ spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG, IF_SPI_CIC_HOST_EVENT); - spin_lock_irqsave(&priv->driver_lock, flags); lbs_queue_event(priv, cause & 0xff); - spin_unlock_irqrestore(&priv->driver_lock, flags); - out: if (err) lbs_pr_err("%s: error %d\n", __func__, err); |