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| author | Dipankar Sarma <dipankar@in.ibm.com> | 2005-09-16 19:28:13 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-17 11:50:02 -0700 |
| commit | 4fb3a53860cee2aaaf81186c451b7da0b95b45c1 (patch) | |
| tree | db66ba7d3886644729707586aed781c445e12c16 /arch | |
| parent | af4e5a218e18ad588d60a4f9d6f8fb5db1a32587 (diff) | |
| download | op-kernel-dev-4fb3a53860cee2aaaf81186c451b7da0b95b45c1.zip op-kernel-dev-4fb3a53860cee2aaaf81186c451b7da0b95b45c1.tar.gz | |
[PATCH] files: fix preemption issues
With the new fdtable locking rules, you have to protect fdtable with either
->file_lock or rcu_read_lock/unlock(). There are some places where we
aren't doing either. This patch fixes those places.
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')
| -rw-r--r-- | arch/alpha/kernel/osf_sys.c | 7 | ||||
| -rw-r--r-- | arch/ia64/kernel/perfmon.c | 3 |
2 files changed, 8 insertions, 2 deletions
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c index 0636116..01fe990d 100644 --- a/arch/alpha/kernel/osf_sys.c +++ b/arch/alpha/kernel/osf_sys.c @@ -37,6 +37,7 @@ #include <linux/namei.h> #include <linux/uio.h> #include <linux/vfs.h> +#include <linux/rcupdate.h> #include <asm/fpu.h> #include <asm/io.h> @@ -975,6 +976,7 @@ osf_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, long timeout; int ret = -EINVAL; struct fdtable *fdt; + int max_fdset; timeout = MAX_SCHEDULE_TIMEOUT; if (tvp) { @@ -996,8 +998,11 @@ osf_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, } } + rcu_read_lock(); fdt = files_fdtable(current->files); - if (n < 0 || n > fdt->max_fdset) + max_fdset = fdt->max_fdset; + rcu_read_unlock(); + if (n < 0 || n > max_fdset) goto out_nofds; /* diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c index af42cda..d71731e 100644 --- a/arch/ia64/kernel/perfmon.c +++ b/arch/ia64/kernel/perfmon.c @@ -2218,12 +2218,13 @@ static void pfm_free_fd(int fd, struct file *file) { struct files_struct *files = current->files; - struct fdtable *fdt = files_fdtable(files); + struct fdtable *fdt; /* * there ie no fd_uninstall(), so we do it here */ spin_lock(&files->file_lock); + fdt = files_fdtable(files); rcu_assign_pointer(fdt->fd[fd], NULL); spin_unlock(&files->file_lock); |
