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authorDipankar Sarma <dipankar@in.ibm.com>2005-09-16 19:28:13 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-17 11:50:02 -0700
commit4fb3a53860cee2aaaf81186c451b7da0b95b45c1 (patch)
treedb66ba7d3886644729707586aed781c445e12c16 /arch
parentaf4e5a218e18ad588d60a4f9d6f8fb5db1a32587 (diff)
downloadblackbird-op-linux-4fb3a53860cee2aaaf81186c451b7da0b95b45c1.tar.gz
blackbird-op-linux-4fb3a53860cee2aaaf81186c451b7da0b95b45c1.zip
[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.c7
-rw-r--r--arch/ia64/kernel/perfmon.c3
2 files changed, 8 insertions, 2 deletions
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 0636116210d2..01fe990d3e54 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 af42cda6be80..d71731ee5b61 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);
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