mmc: balanc pci_iomap with pci_iounmap

[pandora-kernel.git] / fs / fcntl.c

diff --git a/fs/fcntl.c b/fs/fcntl.c
index c594cc0..cdc1419 100644 (file)
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -19,6 +19,7 @@
 #include <linux/signal.h>
 #include <linux/rcupdate.h>
 #include <linux/pid_namespace.h>
+#include <linux/smp_lock.h>
 
 #include <asm/poll.h>
 #include <asm/siginfo.h>
@@ -175,6 +176,11 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
        if (error)
                return error;
 
+       /*
+        * We still need a lock here for now to keep multiple FASYNC calls
+        * from racing with each other.
+        */
+       lock_kernel();
        if ((arg ^ filp->f_flags) & FASYNC) {
                if (filp->f_op && filp->f_op->fasync) {
                        error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0);
@@ -185,6 +191,7 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
 
        filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK);
  out:
+       unlock_kernel();
        return error;
 }
 
@@ -401,10 +408,17 @@ static const long band_table[NSIGPOLL] = {
 static inline int sigio_perm(struct task_struct *p,
                              struct fown_struct *fown, int sig)
 {
-       return (((fown->euid == 0) ||
-                (fown->euid == p->cred->suid) || (fown->euid == p->cred->uid) ||
-                (fown->uid == p->cred->suid) || (fown->uid == p->cred->uid)) &&
-               !security_file_send_sigiotask(p, fown, sig));
+       const struct cred *cred;
+       int ret;
+
+       rcu_read_lock();
+       cred = __task_cred(p);
+       ret = ((fown->euid == 0 ||
+               fown->euid == cred->suid || fown->euid == cred->uid ||
+               fown->uid  == cred->suid || fown->uid  == cred->uid) &&
+              !security_file_send_sigiotask(p, fown, sig));
+       rcu_read_unlock();
+       return ret;
 }
 
 static void send_sigio_to_task(struct task_struct *p,