diff options
| -rw-r--r-- | drivers/ata/ahci.c | 16 | ||||
| -rw-r--r-- | drivers/ide/ide-probe.c | 2 | ||||
| -rw-r--r-- | drivers/ide/ide.c | 24 | ||||
| -rw-r--r-- | fs/proc/task_mmu.c | 8 | ||||
| -rw-r--r-- | mm/mempolicy.c | 6 |
5 files changed, 30 insertions, 26 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 061817a3a0e5..5e6468a7ca4b 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -1777,7 +1777,7 @@ static irqreturn_t ahci_interrupt(int irq, void *dev_instance) struct ahci_host_priv *hpriv; unsigned int i, handled = 0; void __iomem *mmio; - u32 irq_stat; + u32 irq_stat, irq_masked; VPRINTK("ENTER\n"); @@ -1786,16 +1786,17 @@ static irqreturn_t ahci_interrupt(int irq, void *dev_instance) /* sigh. 0xffffffff is a valid return from h/w */ irq_stat = readl(mmio + HOST_IRQ_STAT); - irq_stat &= hpriv->port_map; if (!irq_stat) return IRQ_NONE; + irq_masked = irq_stat & hpriv->port_map; + spin_lock(&host->lock); for (i = 0; i < host->n_ports; i++) { struct ata_port *ap; - if (!(irq_stat & (1 << i))) + if (!(irq_masked & (1 << i))) continue; ap = host->ports[i]; @@ -1812,6 +1813,15 @@ static irqreturn_t ahci_interrupt(int irq, void *dev_instance) handled = 1; } + /* HOST_IRQ_STAT behaves as level triggered latch meaning that + * it should be cleared after all the port events are cleared; + * otherwise, it will raise a spurious interrupt after each + * valid one. Please read section 10.6.2 of ahci 1.1 for more + * information. + * + * Also, use the unmasked value to clear interrupt as spurious + * pending event on a dummy port might cause screaming IRQ. + */ writel(irq_stat, mmio + HOST_IRQ_STAT); spin_unlock(&host->lock); diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c index 380fa0c8cc84..d27061b39324 100644 --- a/drivers/ide/ide-probe.c +++ b/drivers/ide/ide-probe.c @@ -646,8 +646,6 @@ static int ide_register_port(ide_hwif_t *hwif) goto out; } - get_device(&hwif->gendev); - hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev, MKDEV(0, 0), hwif, hwif->name); if (IS_ERR(hwif->portdev)) { diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c index c758dcb13b14..300431d080a9 100644 --- a/drivers/ide/ide.c +++ b/drivers/ide/ide.c @@ -315,13 +315,14 @@ void ide_unregister(ide_hwif_t *hwif) BUG_ON(in_interrupt()); BUG_ON(irqs_disabled()); + mutex_lock(&ide_cfg_mtx); - spin_lock_irq(&ide_lock); - if (!hwif->present) - goto abort; - __ide_port_unregister_devices(hwif); - hwif->present = 0; + spin_lock_irq(&ide_lock); + if (hwif->present) { + __ide_port_unregister_devices(hwif); + hwif->present = 0; + } spin_unlock_irq(&ide_lock); ide_proc_unregister_port(hwif); @@ -351,16 +352,15 @@ void ide_unregister(ide_hwif_t *hwif) blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS); kfree(hwif->sg_table); unregister_blkdev(hwif->major, hwif->name); - spin_lock_irq(&ide_lock); if (hwif->dma_base) ide_release_dma_engine(hwif); + spin_lock_irq(&ide_lock); /* restore hwif data to pristine status */ ide_init_port_data(hwif, hwif->index); - -abort: spin_unlock_irq(&ide_lock); + mutex_unlock(&ide_cfg_mtx); } @@ -1094,13 +1094,6 @@ struct bus_type ide_bus_type = { EXPORT_SYMBOL_GPL(ide_bus_type); -static void ide_port_class_release(struct device *portdev) -{ - ide_hwif_t *hwif = dev_get_drvdata(portdev); - - put_device(&hwif->gendev); -} - int ide_vlb_clk; EXPORT_SYMBOL_GPL(ide_vlb_clk); @@ -1305,7 +1298,6 @@ static int __init ide_init(void) ret = PTR_ERR(ide_port_class); goto out_port_class; } - ide_port_class->dev_release = ide_port_class_release; init_ide_data(); diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index ab8ccc9d14ff..05053d701ac5 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -476,10 +476,10 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, return -ESRCH; mm = get_task_mm(task); if (mm) { - static struct mm_walk clear_refs_walk; - memset(&clear_refs_walk, 0, sizeof(clear_refs_walk)); - clear_refs_walk.pmd_entry = clear_refs_pte_range; - clear_refs_walk.mm = mm; + struct mm_walk clear_refs_walk = { + .pmd_entry = clear_refs_pte_range, + .mm = mm, + }; down_read(&mm->mmap_sem); for (vma = mm->mmap; vma; vma = vma->vm_next) { clear_refs_walk.private = vma; diff --git a/mm/mempolicy.c b/mm/mempolicy.c index a37a5034f63d..c94e58b192c3 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -729,7 +729,11 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask, } else { *policy = pol == &default_policy ? MPOL_DEFAULT : pol->mode; - *policy |= pol->flags; + /* + * Internal mempolicy flags must be masked off before exposing + * the policy to userspace. + */ + *policy |= (pol->flags & MPOL_MODE_FLAGS); } if (vma) { |