diff options
| author |   Jiri Slaby <jirislaby@gmail.com> | 2007-05-23 13:57:58 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-23 20:14:14 -0700 |
| commit | c15395c0dbdd646ca80945a7578c8c6cd44ce942 (patch) | |
| tree | 6a1d0df3fb9ccd16f286daca6fcd1f4787a54a7c /drivers/misc | |
| parent | simplify cleanup_workqueue_thread() (diff) | |
| download | linux-dev-c15395c0dbdd646ca80945a7578c8c6cd44ce942.tar.xz linux-dev-c15395c0dbdd646ca80945a7578c8c6cd44ce942.zip | |
phantom: move to unlocked_ioctl
phantom's ioctl is often (4000 times a sec or so) invoked, don't acquire
BKL and block other processes.
Signed-off-by: Jiri Slaby <xslaby@phantom.fi.muni.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/phantom.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/misc/phantom.c b/drivers/misc/phantom.c index 35b139b0e5f2..4b5959b2c934 100644 --- a/drivers/misc/phantom.c +++ b/drivers/misc/phantom.c @@ -47,6 +47,7 @@ struct phantom_device { struct cdev cdev; struct mutex open_lock; + spinlock_t ioctl_lock; }; static unsigned char phantom_devices[PHANTOM_MAX_MINORS]; @@ -71,8 +72,8 @@ static int phantom_status(struct phantom_device *dev, unsigned long newstat) * File ops */ -static int phantom_ioctl(struct inode *inode, struct file *file, u_int cmd, - u_long arg) +static long phantom_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) { struct phantom_device *dev = file->private_data; struct phm_regs rs; @@ -92,24 +93,30 @@ static int phantom_ioctl(struct inode *inode, struct file *file, u_int cmd, if (r.reg > 7) return -EINVAL; + spin_lock(&dev->ioctl_lock); if (r.reg == PHN_CONTROL && (r.value & PHN_CTL_IRQ) && - phantom_status(dev, dev->status | PHB_RUNNING)) + phantom_status(dev, dev->status | PHB_RUNNING)){ + spin_unlock(&dev->ioctl_lock); return -ENODEV; + } pr_debug("phantom: writing %x to %u\n", r.value, r.reg); iowrite32(r.value, dev->iaddr + r.reg); if (r.reg == PHN_CONTROL && !(r.value & PHN_CTL_IRQ)) phantom_status(dev, dev->status & ~PHB_RUNNING); + spin_unlock(&dev->ioctl_lock); break; case PHN_SET_REGS: if (copy_from_user(&rs, argp, sizeof(rs))) return -EFAULT; pr_debug("phantom: SRS %u regs %x\n", rs.count, rs.mask); + spin_lock(&dev->ioctl_lock); for (i = 0; i < min(rs.count, 8U); i++) if ((1 << i) & rs.mask) iowrite32(rs.values[i], dev->oaddr + i); + spin_unlock(&dev->ioctl_lock); break; case PHN_GET_REG: if (copy_from_user(&r, argp, sizeof(r))) @@ -128,9 +135,11 @@ static int phantom_ioctl(struct inode *inode, struct file *file, u_int cmd, return -EFAULT; pr_debug("phantom: GRS %u regs %x\n", rs.count, rs.mask); + spin_lock(&dev->ioctl_lock); for (i = 0; i < min(rs.count, 8U); i++) if ((1 << i) & rs.mask) rs.values[i] = ioread32(dev->iaddr + i); + spin_unlock(&dev->ioctl_lock); if (copy_to_user(argp, &rs, sizeof(rs))) return -EFAULT; @@ -199,7 +208,7 @@ static unsigned int phantom_poll(struct file *file, poll_table *wait) static struct file_operations phantom_file_ops = { .open = phantom_open, .release = phantom_release, - .ioctl = phantom_ioctl, + .unlocked_ioctl = phantom_ioctl, .poll = phantom_poll, }; @@ -282,6 +291,7 @@ static int __devinit phantom_probe(struct pci_dev *pdev, } mutex_init(&pht->open_lock); + spin_lock_init(&pht->ioctl_lock); init_waitqueue_head(&pht->wait); cdev_init(&pht->cdev, &phantom_file_ops); pht->cdev.owner = THIS_MODULE; |