X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fselect.c;h=f10a10317d5494e0eb4995d9c016113a093f34ee;hb=9fe66dfd8846706ff11ed7990d06c92644973bd8;hp=2e56325c73c47933e10be4d695831639c84744a1;hpb=badf16621c1f9d1ac753be056fce11b43d6e0be5;p=linux-2.6

diff --git a/fs/select.c b/fs/select.c
index 2e56325c73..f10a10317d 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -22,6 +22,7 @@
 #include <linux/personality.h> /* for STICKY_TIMEOUTS */
 #include <linux/file.h>
 #include <linux/fs.h>
+#include <linux/rcupdate.h>
 
 #include <asm/uaccess.h>
 
@@ -185,9 +186,9 @@ int do_select(int n, fd_set_bits *fds, long *timeout)
 	int retval, i;
 	long __timeout = *timeout;
 
- 	spin_lock(&current->files->file_lock);
+	rcu_read_lock();
 	retval = max_select_fd(n, fds);
-	spin_unlock(&current->files->file_lock);
+	rcu_read_unlock();
 
 	if (retval < 0)
 		return retval;
@@ -329,8 +330,10 @@ sys_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, s
 		goto out_nofds;
 
 	/* max_fdset can increase, so grab it once to avoid race */
+	rcu_read_lock();
 	fdt = files_fdtable(current->files);
 	max_fdset = fdt->max_fdset;
+	rcu_read_unlock();
 	if (n > max_fdset)
 		n = max_fdset;
 
@@ -469,10 +472,14 @@ asmlinkage long sys_poll(struct pollfd __user * ufds, unsigned int nfds, long ti
 	struct poll_list *head;
  	struct poll_list *walk;
 	struct fdtable *fdt;
+	int max_fdset;
 
 	/* Do a sanity check on nfds ... */
+	rcu_read_lock();
 	fdt = files_fdtable(current->files);
-	if (nfds > fdt->max_fdset && nfds > OPEN_MAX)
+	max_fdset = fdt->max_fdset;
+	rcu_read_unlock();
+	if (nfds > max_fdset && nfds > OPEN_MAX)
 		return -EINVAL;
 
 	if (timeout) {