backports: add freezable_schedule_hrtimeout_range()

This is used by the pt3 driver.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/backport/backport-include/linux/freezer.h b/backport/backport-include/linux/freezer.h
new file mode 100644 (file)
index 0000000..6bd6985
--- /dev/null
+++ b/backport/backport-include/linux/freezer.h
@@ -0,0 +1,32 @@
+#ifndef __BACKPORT_FREEZER_H_INCLUDED
+#define __BACKPORT_FREEZER_H_INCLUDED
+#include_next <linux/freezer.h>
+
+#ifdef CONFIG_FREEZER
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,11,0)
+/*
+ * Like schedule_hrtimeout_range(), but should not block the freezer.  Do not
+ * call this with locks held.
+ */
+#define freezable_schedule_hrtimeout_range LINUX_BACKPORT(freezable_schedule_hrtimeout_range)
+static inline int freezable_schedule_hrtimeout_range(ktime_t *expires,
+               unsigned long delta, const enum hrtimer_mode mode)
+{
+       int __retval;
+       freezer_do_not_count();
+       __retval = schedule_hrtimeout_range(expires, delta, mode);
+       freezer_count();
+       return __retval;
+}
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,11,0) */
+
+#else /* !CONFIG_FREEZER */
+
+#ifndef freezable_schedule_hrtimeout_range
+#define freezable_schedule_hrtimeout_range(expires, delta, mode)       \
+       schedule_hrtimeout_range(expires, delta, mode)
+#endif
+
+#endif /* !CONFIG_FREEZER */
+
+#endif /* __BACKPORT_FREEZER_H_INCLUDED */