From: Joachim Fenkes Date: Tue, 2 Dec 2008 04:58:57 +0000 (-0800) Subject: IB/ehca: Fix locking for shca_list_lock X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=75c21ae9aa75b0452318d05f737ea838672137f5;p=linux-beck.git IB/ehca: Fix locking for shca_list_lock shca_list_lock is taken from softirq context in ehca_poll_eqs, so we need to lock IRQ safe elsewhere. Found by lockdep. Signed-off-by: Michael Ellerman Signed-off-by: Joachim Fenkes Signed-off-by: Roland Dreier --- diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c index bec7e0249358..3b77b674cbf6 100644 --- a/drivers/infiniband/hw/ehca/ehca_main.c +++ b/drivers/infiniband/hw/ehca/ehca_main.c @@ -717,6 +717,7 @@ static int __devinit ehca_probe(struct of_device *dev, const u64 *handle; struct ib_pd *ibpd; int ret, i, eq_size; + unsigned long flags; handle = of_get_property(dev->node, "ibm,hca-handle", NULL); if (!handle) { @@ -830,9 +831,9 @@ static int __devinit ehca_probe(struct of_device *dev, ehca_err(&shca->ib_device, "Cannot create device attributes ret=%d", ret); - spin_lock(&shca_list_lock); + spin_lock_irqsave(&shca_list_lock, flags); list_add(&shca->shca_list, &shca_list); - spin_unlock(&shca_list_lock); + spin_unlock_irqrestore(&shca_list_lock, flags); return 0; @@ -878,6 +879,7 @@ probe1: static int __devexit ehca_remove(struct of_device *dev) { struct ehca_shca *shca = dev->dev.driver_data; + unsigned long flags; int ret; sysfs_remove_group(&dev->dev.kobj, &ehca_dev_attr_grp); @@ -915,9 +917,9 @@ static int __devexit ehca_remove(struct of_device *dev) ib_dealloc_device(&shca->ib_device); - spin_lock(&shca_list_lock); + spin_lock_irqsave(&shca_list_lock, flags); list_del(&shca->shca_list); - spin_unlock(&shca_list_lock); + spin_unlock_irqrestore(&shca_list_lock, flags); return ret; } @@ -975,6 +977,7 @@ static int ehca_mem_notifier(struct notifier_block *nb, unsigned long action, void *data) { static unsigned long ehca_dmem_warn_time; + unsigned long flags; switch (action) { case MEM_CANCEL_OFFLINE: @@ -985,12 +988,12 @@ static int ehca_mem_notifier(struct notifier_block *nb, case MEM_GOING_ONLINE: case MEM_GOING_OFFLINE: /* only ok if no hca is attached to the lpar */ - spin_lock(&shca_list_lock); + spin_lock_irqsave(&shca_list_lock, flags); if (list_empty(&shca_list)) { - spin_unlock(&shca_list_lock); + spin_unlock_irqrestore(&shca_list_lock, flags); return NOTIFY_OK; } else { - spin_unlock(&shca_list_lock); + spin_unlock_irqrestore(&shca_list_lock, flags); if (printk_timed_ratelimit(&ehca_dmem_warn_time, 30 * 1000)) ehca_gen_err("DMEM operations are not allowed"