[MTD] Simplify NAND locking

Replace the chip lock by a the controller lock. For simple drivers a
dummy controller structure is created by the scan code.
This simplifies the locking algorithm in nand_get/release_chip().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index da5e67b3fc70..b8792be3c4e0 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -227,6 +227,8 @@ extern int nand_read_raw (struct mtd_info *mtd, uint8_t *buf, loff_t from, size_
 #define NAND_SKIP_BBTSCAN       0x00040000
 
 /* Options set by nand scan */
+/* Nand scan has allocated controller struct */
+#define NAND_CONTROLLER_ALLOC   0x20000000
 /* Nand scan has allocated oob_buf */
 #define NAND_OOBBUF_ALLOC       0x40000000
 /* Nand scan has allocated data_buf */
@@ -294,7 +296,6 @@ struct nand_hw_control {
  * @eccbytes:           [INTERN] number of ecc bytes per ecc-calculation step
  * @eccsteps:           [INTERN] number of ecc calculation steps per page
  * @chip_delay:         [BOARDSPECIFIC] chip dependent delay for transfering data from array to read regs (tR)
- * @chip_lock:          [INTERN] spinlock used to protect access to this structure and the chip
  * @wq:                 [INTERN] wait queue to sleep on if a NAND operation is in progress
  * @state:              [INTERN] the current state of the NAND device
  * @page_shift:         [INTERN] number of address bits in a page (column address bits)
@@ -317,7 +318,8 @@ struct nand_hw_control {
  * @bbt_td:             [REPLACEABLE] bad block table descriptor for flash lookup
  * @bbt_md:             [REPLACEABLE] bad block table mirror descriptor
  * @badblock_pattern:   [REPLACEABLE] bad block scan pattern used for initial bad block scan
- * @controller:         [OPTIONAL] a pointer to a hardware controller structure which is shared among multiple independend devices
+ * @controller:         [REPLACEABLE] a pointer to a hardware controller structure
+ *                      which is shared among multiple independend devices
  * @priv:               [OPTIONAL] pointer to private chip date
  * @errstat:            [OPTIONAL] hardware specific function to perform additional error status checks
  *                      (determine if errors are correctable)
@@ -352,7 +354,6 @@ struct nand_chip {
         int             eccbytes;
         int             eccsteps;
         int             chip_delay;
-        spinlock_t      chip_lock;
         wait_queue_head_t wq;
         nand_state_t    state;
         int             page_shift;