diff options
| author | Dipankar Sarma <dipankar@in.ibm.com> | 2005-09-09 13:04:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 13:57:55 -0700 |
| commit | b835996f628eadb55c5fb222ba46fe9395bf73c7 (patch) | |
| tree | d63d80585d197e1ffc299af4a0034049790fb197 /arch/mips/kernel/irixioctl.c | |
| parent | ab2af1f5005069321c5d130f09cce577b03f43ef (diff) | |
| download | blackbird-op-linux-b835996f628eadb55c5fb222ba46fe9395bf73c7.tar.gz blackbird-op-linux-b835996f628eadb55c5fb222ba46fe9395bf73c7.zip | |
[PATCH] files: lock-free fd look-up
With the use of RCU in files structure, the look-up of files using fds can now
be lock-free. The lookup is protected by rcu_read_lock()/rcu_read_unlock().
This patch changes the readers to use lock-free lookup.
Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Ravikiran Thirumalai <kiran_th@gmail.com>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/mips/kernel/irixioctl.c')
| -rw-r--r-- | arch/mips/kernel/irixioctl.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/mips/kernel/irixioctl.c b/arch/mips/kernel/irixioctl.c index 4cd3d38a22c2..3cdc22346f4c 100644 --- a/arch/mips/kernel/irixioctl.c +++ b/arch/mips/kernel/irixioctl.c @@ -14,6 +14,7 @@ #include <linux/syscalls.h> #include <linux/tty.h> #include <linux/file.h> +#include <linux/rcupdate.h> #include <asm/uaccess.h> #include <asm/ioctl.h> @@ -33,7 +34,7 @@ static struct tty_struct *get_tty(int fd) struct file *filp; struct tty_struct *ttyp = NULL; - spin_lock(¤t->files->file_lock); + rcu_read_lock(); filp = fcheck(fd); if(filp && filp->private_data) { ttyp = (struct tty_struct *) filp->private_data; @@ -41,7 +42,7 @@ static struct tty_struct *get_tty(int fd) if(ttyp->magic != TTY_MAGIC) ttyp =NULL; } - spin_unlock(¤t->files->file_lock); + rcu_read_unlock(); return ttyp; } |
