#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>
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);
filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK);
out:
+ unlock_kernel();
return error;
}