Merge remote-tracking branch 'spi/fix/locking' into spi-next

1 files changed, 5 insertions, 1 deletions

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 7b53af4ba5f8..072cb2aa2413 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -312,8 +312,9 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
  * @flags: other constraints relevant to this driver
  * @max_transfer_size: function that returns the max transfer size for
  *	a &spi_device; may be %NULL, so the default %SIZE_MAX will be used.
+ * @io_mutex: mutex for physical bus access
  * @bus_lock_spinlock: spinlock for SPI bus locking
- * @bus_lock_mutex: mutex for SPI bus locking
+ * @bus_lock_mutex: mutex for exclusion of multiple callers
  * @bus_lock_flag: indicates that the SPI bus is locked for exclusive use
  * @setup: updates the device mode and clocking records used by a
  *	device's SPI controller; protocol code may call this.  This
@@ -446,6 +447,9 @@ struct spi_master {
 	 */
 	size_t (*max_transfer_size)(struct spi_device *spi);
 
+	/* I/O mutex */
+	struct mutex		io_mutex;
+
 	/* lock and mutex for SPI bus locking */
 	spinlock_t		bus_lock_spinlock;
 	struct mutex		bus_lock_mutex;