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Merge branch 'queue' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

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Pull target fixes from Nicholas Bellinger:
 "A handful of fixes + minor changes this time around, along with one
  important >= v3.9 regression fix for IBLOCK backends.  The highlights
  include:

   - Use FD_MAX_SECTORS in FILEIO for block_device as
     well as files (agrover)

   - Fix processing of out-of-order CmdSNs with
     iSBD driver (shlomo)

   - Close long-standing target_put_sess_cmd() vs.
     core_tmr_abort_task() race with the addition of
     kref_put_spinlock_irqsave() (joern + greg-kh)

   - Fix IBLOCK WCE=1 + DPOFUA=1 backend WRITE
     regression in >= v3.9 (nab + bootc)

  Note these four patches are CC'ed to stable.

  Also, there is still some work left to be done on the active I/O
  shutdown path in target_wait_for_sess_cmds() used by tcm_qla2xxx +
  ib_isert fabrics that is still being discussed on the list, and will
  hopefully be resolved soon."

* 'queue' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
  target: close target_put_sess_cmd() vs. core_tmr_abort_task() race
  target: removed unused transport_state flag
  target/iblock: Fix WCE=1 + DPOFUA=1 backend WRITE regression
  MAINTAINERS: Update target git tree URL
  iscsi-target: Fix typos in RDMAEXTENSIONS macro usage
  target/rd: Add ramdisk bit for NULLIO operation
  iscsi-target: Fix processing of OOO commands
  iscsi-target: Make buf param of iscsit_do_crypto_hash_buf() const void *
  iscsi-target: Fix NULL pointer dereference in iscsit_send_reject
  target: Have dev/enable show if TCM device is configured
  target: Use FD_MAX_SECTORS/FD_BLOCKSIZE for blockdevs using fileio
  target: Remove unused struct members in se_dev_entry
This commit is contained in:
Linus Torvalds 2013-05-16 07:55:07 -07:00
commit 5c64e3a45d
15 changed files with 107 additions and 87 deletions
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33
include/linux/kref.h
View file

@ -19,6 +19,7 @@
#include <linux/atomic.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
struct kref {
atomic_t refcount;
@ -98,6 +99,38 @@ static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref)
return kref_sub(kref, 1, release);
}
/**
* kref_put_spinlock_irqsave - decrement refcount for object.
* @kref: object.
* @release: pointer to the function that will clean up the object when the
* last reference to the object is released.
* This pointer is required, and it is not acceptable to pass kfree
* in as this function.
* @lock: lock to take in release case
*
* Behaves identical to kref_put with one exception. If the reference count
* drops to zero, the lock will be taken atomically wrt dropping the reference
* count. The release function has to call spin_unlock() without _irqrestore.
*/
static inline int kref_put_spinlock_irqsave(struct kref *kref,
void (*release)(struct kref *kref),
spinlock_t *lock)
{
unsigned long flags;
WARN_ON(release == NULL);
if (atomic_add_unless(&kref->refcount, -1, 1))
return 0;
spin_lock_irqsave(lock, flags);
if (atomic_dec_and_test(&kref->refcount)) {
release(kref);
local_irq_restore(flags);
return 1;
}
spin_unlock_irqrestore(lock, flags);
return 0;
}
static inline int kref_put_mutex(struct kref *kref,
void (*release)(struct kref *kref),
struct mutex *lock)