Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6
authorLinus Torvalds <torvalds@linux-foundation.org>
Mon, 14 Jul 2008 21:48:31 +0000 (14:48 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 14 Jul 2008 21:48:31 +0000 (14:48 -0700)
* 'bkl-removal' of git://git.lwn.net/linux-2.6: (146 commits)
  IB/umad: BKL is not needed for ib_umad_open()
  IB/uverbs: BKL is not needed for ib_uverbs_open()
  bf561-coreb: BKL unneeded for open()
  Call fasync() functions without the BKL
  snd/PCM: fasync BKL pushdown
  ipmi: fasync BKL pushdown
  ecryptfs: fasync BKL pushdown
  Bluetooth VHCI: fasync BKL pushdown
  tty_io: fasync BKL pushdown
  tun: fasync BKL pushdown
  i2o: fasync BKL pushdown
  mpt: fasync BKL pushdown
  Remove BKL from remote_llseek v2
  Make FAT users happier by not deadlocking
  x86-mce: BKL pushdown
  vmwatchdog: BKL pushdown
  vmcp: BKL pushdown
  via-pmu: BKL pushdown
  uml-random: BKL pushdown
  uml-mmapper: BKL pushdown
  ...

17 files changed:
1  2 
arch/s390/crypto/prng.c
arch/x86/kernel/apm_32.c
arch/x86/kernel/cpu/mcheck/mce_64.c
arch/x86/kernel/microcode.c
block/bsg.c
drivers/block/paride/pt.c
drivers/gpu/drm/drm_fops.c
drivers/pcmcia/pcmcia_ioctl.c
drivers/s390/char/fs3270.c
drivers/s390/char/monreader.c
drivers/s390/char/vmcp.c
drivers/s390/char/vmlogrdr.c
drivers/s390/char/vmur.c
drivers/s390/char/vmwatchdog.c
drivers/s390/crypto/zcrypt_api.c
drivers/scsi/sg.c
sound/core/sound.c

Simple merge
Simple merge
Simple merge
Simple merge
diff --cc block/bsg.c
Simple merge
Simple merge
index d2e6da85f58ac262b2297b6e8281c943aa009cf1,0000000000000000000000000000000000000000..851a53f1accefa0ee1d84772a6ec5a182d609969
mode 100644,000000..100644
--- /dev/null
@@@ -1,466 -1,0 +1,471 @@@
-               return -ENODEV;
 +/**
 + * \file drm_fops.c
 + * File operations for DRM
 + *
 + * \author Rickard E. (Rik) Faith <faith@valinux.com>
 + * \author Daryll Strauss <daryll@valinux.com>
 + * \author Gareth Hughes <gareth@valinux.com>
 + */
 +
 +/*
 + * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
 + *
 + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 + * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 + * All Rights Reserved.
 + *
 + * Permission is hereby granted, free of charge, to any person obtaining a
 + * copy of this software and associated documentation files (the "Software"),
 + * to deal in the Software without restriction, including without limitation
 + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 + * and/or sell copies of the Software, and to permit persons to whom the
 + * Software is furnished to do so, subject to the following conditions:
 + *
 + * The above copyright notice and this permission notice (including the next
 + * paragraph) shall be included in all copies or substantial portions of the
 + * Software.
 + *
 + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 + * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 + * OTHER DEALINGS IN THE SOFTWARE.
 + */
 +
 +#include "drmP.h"
 +#include "drm_sarea.h"
 +#include <linux/poll.h>
++#include <linux/smp_lock.h>
 +
 +static int drm_open_helper(struct inode *inode, struct file *filp,
 +                         struct drm_device * dev);
 +
 +static int drm_setup(struct drm_device * dev)
 +{
 +      drm_local_map_t *map;
 +      int i;
 +      int ret;
 +      u32 sareapage;
 +
 +      if (dev->driver->firstopen) {
 +              ret = dev->driver->firstopen(dev);
 +              if (ret != 0)
 +                      return ret;
 +      }
 +
 +      dev->magicfree.next = NULL;
 +
 +      /* prebuild the SAREA */
 +      sareapage = max_t(unsigned, SAREA_MAX, PAGE_SIZE);
 +      i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map);
 +      if (i != 0)
 +              return i;
 +
 +      atomic_set(&dev->ioctl_count, 0);
 +      atomic_set(&dev->vma_count, 0);
 +      dev->buf_use = 0;
 +      atomic_set(&dev->buf_alloc, 0);
 +
 +      if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
 +              i = drm_dma_setup(dev);
 +              if (i < 0)
 +                      return i;
 +      }
 +
 +      for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
 +              atomic_set(&dev->counts[i], 0);
 +
 +      drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
 +      INIT_LIST_HEAD(&dev->magicfree);
 +
 +      dev->sigdata.lock = NULL;
 +      init_waitqueue_head(&dev->lock.lock_queue);
 +      dev->queue_count = 0;
 +      dev->queue_reserved = 0;
 +      dev->queue_slots = 0;
 +      dev->queuelist = NULL;
 +      dev->irq_enabled = 0;
 +      dev->context_flag = 0;
 +      dev->interrupt_flag = 0;
 +      dev->dma_flag = 0;
 +      dev->last_context = 0;
 +      dev->last_switch = 0;
 +      dev->last_checked = 0;
 +      init_waitqueue_head(&dev->context_wait);
 +      dev->if_version = 0;
 +
 +      dev->ctx_start = 0;
 +      dev->lck_start = 0;
 +
 +      dev->buf_async = NULL;
 +      init_waitqueue_head(&dev->buf_readers);
 +      init_waitqueue_head(&dev->buf_writers);
 +
 +      DRM_DEBUG("\n");
 +
 +      /*
 +       * The kernel's context could be created here, but is now created
 +       * in drm_dma_enqueue.  This is more resource-efficient for
 +       * hardware that does not do DMA, but may mean that
 +       * drm_select_queue fails between the time the interrupt is
 +       * initialized and the time the queues are initialized.
 +       */
 +
 +      return 0;
 +}
 +
 +/**
 + * Open file.
 + *
 + * \param inode device inode
 + * \param filp file pointer.
 + * \return zero on success or a negative number on failure.
 + *
 + * Searches the DRM device with the same minor number, calls open_helper(), and
 + * increments the device open count. If the open count was previous at zero,
 + * i.e., it's the first that the device is open, then calls setup().
 + */
 +int drm_open(struct inode *inode, struct file *filp)
 +{
 +      struct drm_device *dev = NULL;
 +      int minor_id = iminor(inode);
 +      struct drm_minor *minor;
 +      int retcode = 0;
 +
 +      minor = idr_find(&drm_minors_idr, minor_id);
 +      if (!minor)
 +              return -ENODEV;
 +
 +      if (!(dev = minor->dev))
 +              return -ENODEV;
 +
 +      retcode = drm_open_helper(inode, filp, dev);
 +      if (!retcode) {
 +              atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
 +              spin_lock(&dev->count_lock);
 +              if (!dev->open_count++) {
 +                      spin_unlock(&dev->count_lock);
 +                      return drm_setup(dev);
 +              }
 +              spin_unlock(&dev->count_lock);
 +      }
 +
 +      return retcode;
 +}
 +EXPORT_SYMBOL(drm_open);
 +
 +/**
 + * File \c open operation.
 + *
 + * \param inode device inode.
 + * \param filp file pointer.
 + *
 + * Puts the dev->fops corresponding to the device minor number into
 + * \p filp, call the \c open method, and restore the file operations.
 + */
 +int drm_stub_open(struct inode *inode, struct file *filp)
 +{
 +      struct drm_device *dev = NULL;
 +      struct drm_minor *minor;
 +      int minor_id = iminor(inode);
 +      int err = -ENODEV;
 +      const struct file_operations *old_fops;
 +
 +      DRM_DEBUG("\n");
 +
++      /* BKL pushdown: note that nothing else serializes idr_find() */
++      lock_kernel();
 +      minor = idr_find(&drm_minors_idr, minor_id);
 +      if (!minor)
-               return -ENODEV;
++              goto out;
 +
 +      if (!(dev = minor->dev))
++              goto out;
 +
 +      old_fops = filp->f_op;
 +      filp->f_op = fops_get(&dev->driver->fops);
 +      if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
 +              fops_put(filp->f_op);
 +              filp->f_op = fops_get(old_fops);
 +      }
 +      fops_put(old_fops);
 +
++out:
++      unlock_kernel();
 +      return err;
 +}
 +
 +/**
 + * Check whether DRI will run on this CPU.
 + *
 + * \return non-zero if the DRI will run on this CPU, or zero otherwise.
 + */
 +static int drm_cpu_valid(void)
 +{
 +#if defined(__i386__)
 +      if (boot_cpu_data.x86 == 3)
 +              return 0;       /* No cmpxchg on a 386 */
 +#endif
 +#if defined(__sparc__) && !defined(__sparc_v9__)
 +      return 0;               /* No cmpxchg before v9 sparc. */
 +#endif
 +      return 1;
 +}
 +
 +/**
 + * Called whenever a process opens /dev/drm.
 + *
 + * \param inode device inode.
 + * \param filp file pointer.
 + * \param dev device.
 + * \return zero on success or a negative number on failure.
 + *
 + * Creates and initializes a drm_file structure for the file private data in \p
 + * filp and add it into the double linked list in \p dev.
 + */
 +static int drm_open_helper(struct inode *inode, struct file *filp,
 +                         struct drm_device * dev)
 +{
 +      int minor_id = iminor(inode);
 +      struct drm_file *priv;
 +      int ret;
 +
 +      if (filp->f_flags & O_EXCL)
 +              return -EBUSY;  /* No exclusive opens */
 +      if (!drm_cpu_valid())
 +              return -EINVAL;
 +
 +      DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);
 +
 +      priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
 +      if (!priv)
 +              return -ENOMEM;
 +
 +      memset(priv, 0, sizeof(*priv));
 +      filp->private_data = priv;
 +      priv->filp = filp;
 +      priv->uid = current->euid;
 +      priv->pid = task_pid_nr(current);
 +      priv->minor = idr_find(&drm_minors_idr, minor_id);
 +      priv->ioctl_count = 0;
 +      /* for compatibility root is always authenticated */
 +      priv->authenticated = capable(CAP_SYS_ADMIN);
 +      priv->lock_count = 0;
 +
 +      INIT_LIST_HEAD(&priv->lhead);
 +
 +      if (dev->driver->open) {
 +              ret = dev->driver->open(dev, priv);
 +              if (ret < 0)
 +                      goto out_free;
 +      }
 +
 +      mutex_lock(&dev->struct_mutex);
 +      if (list_empty(&dev->filelist))
 +              priv->master = 1;
 +
 +      list_add(&priv->lhead, &dev->filelist);
 +      mutex_unlock(&dev->struct_mutex);
 +
 +#ifdef __alpha__
 +      /*
 +       * Default the hose
 +       */
 +      if (!dev->hose) {
 +              struct pci_dev *pci_dev;
 +              pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
 +              if (pci_dev) {
 +                      dev->hose = pci_dev->sysdata;
 +                      pci_dev_put(pci_dev);
 +              }
 +              if (!dev->hose) {
 +                      struct pci_bus *b = pci_bus_b(pci_root_buses.next);
 +                      if (b)
 +                              dev->hose = b->sysdata;
 +              }
 +      }
 +#endif
 +
 +      return 0;
 +      out_free:
 +      drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
 +      filp->private_data = NULL;
 +      return ret;
 +}
 +
 +/** No-op. */
 +int drm_fasync(int fd, struct file *filp, int on)
 +{
 +      struct drm_file *priv = filp->private_data;
 +      struct drm_device *dev = priv->minor->dev;
 +      int retcode;
 +
 +      DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
 +                (long)old_encode_dev(priv->minor->device));
 +      retcode = fasync_helper(fd, filp, on, &dev->buf_async);
 +      if (retcode < 0)
 +              return retcode;
 +      return 0;
 +}
 +EXPORT_SYMBOL(drm_fasync);
 +
 +/**
 + * Release file.
 + *
 + * \param inode device inode
 + * \param file_priv DRM file private.
 + * \return zero on success or a negative number on failure.
 + *
 + * If the hardware lock is held then free it, and take it again for the kernel
 + * context since it's necessary to reclaim buffers. Unlink the file private
 + * data from its list and free it. Decreases the open count and if it reaches
 + * zero calls drm_lastclose().
 + */
 +int drm_release(struct inode *inode, struct file *filp)
 +{
 +      struct drm_file *file_priv = filp->private_data;
 +      struct drm_device *dev = file_priv->minor->dev;
 +      int retcode = 0;
 +
 +      lock_kernel();
 +
 +      DRM_DEBUG("open_count = %d\n", dev->open_count);
 +
 +      if (dev->driver->preclose)
 +              dev->driver->preclose(dev, file_priv);
 +
 +      /* ========================================================
 +       * Begin inline drm_release
 +       */
 +
 +      DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
 +                task_pid_nr(current),
 +                (long)old_encode_dev(file_priv->minor->device),
 +                dev->open_count);
 +
 +      if (dev->driver->reclaim_buffers_locked && dev->lock.hw_lock) {
 +              if (drm_i_have_hw_lock(dev, file_priv)) {
 +                      dev->driver->reclaim_buffers_locked(dev, file_priv);
 +              } else {
 +                      unsigned long endtime = jiffies + 3 * DRM_HZ;
 +                      int locked = 0;
 +
 +                      drm_idlelock_take(&dev->lock);
 +
 +                      /*
 +                       * Wait for a while.
 +                       */
 +
 +                      do{
 +                              spin_lock_bh(&dev->lock.spinlock);
 +                              locked = dev->lock.idle_has_lock;
 +                              spin_unlock_bh(&dev->lock.spinlock);
 +                              if (locked)
 +                                      break;
 +                              schedule();
 +                      } while (!time_after_eq(jiffies, endtime));
 +
 +                      if (!locked) {
 +                              DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
 +                                        "\tdriver to use reclaim_buffers_idlelocked() instead.\n"
 +                                        "\tI will go on reclaiming the buffers anyway.\n");
 +                      }
 +
 +                      dev->driver->reclaim_buffers_locked(dev, file_priv);
 +                      drm_idlelock_release(&dev->lock);
 +              }
 +      }
 +
 +      if (dev->driver->reclaim_buffers_idlelocked && dev->lock.hw_lock) {
 +
 +              drm_idlelock_take(&dev->lock);
 +              dev->driver->reclaim_buffers_idlelocked(dev, file_priv);
 +              drm_idlelock_release(&dev->lock);
 +
 +      }
 +
 +      if (drm_i_have_hw_lock(dev, file_priv)) {
 +              DRM_DEBUG("File %p released, freeing lock for context %d\n",
 +                        filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 +
 +              drm_lock_free(&dev->lock,
 +                            _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
 +      }
 +
 +
 +      if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
 +          !dev->driver->reclaim_buffers_locked) {
 +              dev->driver->reclaim_buffers(dev, file_priv);
 +      }
 +
 +      drm_fasync(-1, filp, 0);
 +
 +      mutex_lock(&dev->ctxlist_mutex);
 +      if (!list_empty(&dev->ctxlist)) {
 +              struct drm_ctx_list *pos, *n;
 +
 +              list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
 +                      if (pos->tag == file_priv &&
 +                          pos->handle != DRM_KERNEL_CONTEXT) {
 +                              if (dev->driver->context_dtor)
 +                                      dev->driver->context_dtor(dev,
 +                                                                pos->handle);
 +
 +                              drm_ctxbitmap_free(dev, pos->handle);
 +
 +                              list_del(&pos->head);
 +                              drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
 +                              --dev->ctx_count;
 +                      }
 +              }
 +      }
 +      mutex_unlock(&dev->ctxlist_mutex);
 +
 +      mutex_lock(&dev->struct_mutex);
 +      if (file_priv->remove_auth_on_close == 1) {
 +              struct drm_file *temp;
 +
 +              list_for_each_entry(temp, &dev->filelist, lhead)
 +                      temp->authenticated = 0;
 +      }
 +      list_del(&file_priv->lhead);
 +      mutex_unlock(&dev->struct_mutex);
 +
 +      if (dev->driver->postclose)
 +              dev->driver->postclose(dev, file_priv);
 +      drm_free(file_priv, sizeof(*file_priv), DRM_MEM_FILES);
 +
 +      /* ========================================================
 +       * End inline drm_release
 +       */
 +
 +      atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
 +      spin_lock(&dev->count_lock);
 +      if (!--dev->open_count) {
 +              if (atomic_read(&dev->ioctl_count) || dev->blocked) {
 +                      DRM_ERROR("Device busy: %d %d\n",
 +                                atomic_read(&dev->ioctl_count), dev->blocked);
 +                      spin_unlock(&dev->count_lock);
 +                      unlock_kernel();
 +                      return -EBUSY;
 +              }
 +              spin_unlock(&dev->count_lock);
 +              unlock_kernel();
 +              return drm_lastclose(dev);
 +      }
 +      spin_unlock(&dev->count_lock);
 +
 +      unlock_kernel();
 +
 +      return retcode;
 +}
 +EXPORT_SYMBOL(drm_release);
 +
 +/** No-op. */
 +unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
 +{
 +      return 0;
 +}
 +EXPORT_SYMBOL(drm_poll);
index afd00e7bbbefe92f53cbfd82cc52ea8f323357e8,138396ef5be9c38886a6c9a856dff081b681a636..419f97fc9a625befbd2805ec1b0693a4bb1af6b1
  #include <linux/proc_fs.h>
  #include <linux/poll.h>
  #include <linux/pci.h>
+ #include <linux/smp_lock.h>
  #include <linux/workqueue.h>
  
 -#define IN_CARD_SERVICES
  #include <pcmcia/cs_types.h>
  #include <pcmcia/cs.h>
  #include <pcmcia/cistpl.h>
Simple merge
index f0e4c96afbf803f12c17f296d0fd645a57cb93b4,dc4710e64e0c61134aa1766bf755aecfc7425541..35fd8dfcaaa6d22d2083304ccdd9ebb4137d3af7
@@@ -326,7 -377,9 +328,8 @@@ static int mon_open(struct inode *inode
                rc = -EIO;
                goto out_path;
        }
 -      P_INFO("open, established connection to *MONITOR service\n\n");
        filp->private_data = monpriv;
+       unlock_kernel();
        return nonseekable_open(inode, filp);
  
  out_path:
Simple merge
Simple merge
Simple merge
Simple merge
Simple merge
Simple merge
Simple merge