From: Alexander Aring Date: Wed, 12 Mar 2014 07:21:24 +0000 (+0100) Subject: at86rf230: fix lockdep splats X-Git-Tag: Ubuntu-5.2.0-15.16~13864^2~3 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=6e07a1e0b53d77dbcb08f29d1cca07c6d33a926f;p=mirror_ubuntu-eoan-kernel.git at86rf230: fix lockdep splats This patch fix a lockdep in the at86rf230 driver, otherwise we get: [ 30.206517] ================================= [ 30.211078] [ INFO: inconsistent lock state ] [ 30.215647] 3.14.0-20140108-1-00994-g32e9426 #163 Not tainted [ 30.221660] --------------------------------- [ 30.226222] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. [ 30.232514] systemd-udevd/157 [HC1[1]:SC0[0]:HE0:SE1] takes: [ 30.238439] (&(&lp->lock)->rlock){?.+...}, at: [] at86rf230_isr+0x18/0x44 [ 30.246621] {HARDIRQ-ON-W} state was registered at: [ 30.251728] [] __lock_acquire+0x7a4/0x18d8 [ 30.257135] [] lock_acquire+0x68/0x7c [ 30.262071] [] _raw_spin_lock+0x28/0x38 [ 30.267203] [] at86rf230_xmit+0x1c/0x144 [ 30.272412] [] mac802154_xmit_worker+0x88/0x148 [ 30.278271] [] process_one_work+0x274/0x404 [ 30.283761] [] worker_thread+0x228/0x374 [ 30.288971] [] kthread+0xd0/0xe4 [ 30.293455] [] ret_from_fork+0x14/0x2c [ 30.298493] irq event stamp: 8948 [ 30.301963] hardirqs last enabled at (8947): [] __kmalloc+0xb4/0x110 [ 30.309636] hardirqs last disabled at (8948): [] __irq_svc+0x34/0x5c [ 30.317215] softirqs last enabled at (8452): [] __do_softirq+0x1dc/0x264 [ 30.325243] softirqs last disabled at (8439): [] irq_exit+0x80/0xf4 We use the lp->lock inside the isr of at86rf230, that's why we need the irqsave spinlock calls. Signed-off-by: Alexander Aring Signed-off-by: David S. Miller --- diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c index ab31544bc254..a30258aad139 100644 --- a/drivers/net/ieee802154/at86rf230.c +++ b/drivers/net/ieee802154/at86rf230.c @@ -546,12 +546,12 @@ at86rf230_xmit(struct ieee802154_dev *dev, struct sk_buff *skb) int rc; unsigned long flags; - spin_lock(&lp->lock); + spin_lock_irqsave(&lp->lock, flags); if (lp->irq_busy) { - spin_unlock(&lp->lock); + spin_unlock_irqrestore(&lp->lock, flags); return -EBUSY; } - spin_unlock(&lp->lock); + spin_unlock_irqrestore(&lp->lock, flags); might_sleep(); @@ -725,10 +725,11 @@ static void at86rf230_irqwork_level(struct work_struct *work) static irqreturn_t at86rf230_isr(int irq, void *data) { struct at86rf230_local *lp = data; + unsigned long flags; - spin_lock(&lp->lock); + spin_lock_irqsave(&lp->lock, flags); lp->irq_busy = 1; - spin_unlock(&lp->lock); + spin_unlock_irqrestore(&lp->lock, flags); schedule_work(&lp->irqwork);