mtd: change struct flchip_shared spinlock locking into mutex

[linux-2.6-microblaze.git] / drivers / mtd / chips / cfi_cmdset_0001.c

diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_cmdset_0001.c
index 62f3ea9..97d5546 100644 (file)
--- a/drivers/mtd/chips/cfi_cmdset_0001.c
+++ b/drivers/mtd/chips/cfi_cmdset_0001.c
@@ -63,6 +63,8 @@ static int cfi_intelext_erase_varsize(struct mtd_info *, struct erase_info *);
 static void cfi_intelext_sync (struct mtd_info *);
 static int cfi_intelext_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 static int cfi_intelext_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+static int cfi_intelext_is_locked(struct mtd_info *mtd, loff_t ofs,
+                                 uint64_t len);
 #ifdef CONFIG_MTD_OTP
 static int cfi_intelext_read_fact_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
 static int cfi_intelext_read_user_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
@@ -448,6 +450,7 @@ struct mtd_info *cfi_cmdset_0001(struct map_info *map, int primary)
        mtd->sync    = cfi_intelext_sync;
        mtd->lock    = cfi_intelext_lock;
        mtd->unlock  = cfi_intelext_unlock;
+       mtd->is_locked = cfi_intelext_is_locked;
        mtd->suspend = cfi_intelext_suspend;
        mtd->resume  = cfi_intelext_resume;
        mtd->flags   = MTD_CAP_NORFLASH;
@@ -717,7 +720,7 @@ static int cfi_intelext_partition_fixup(struct mtd_info *mtd,
                chip = &newcfi->chips[0];
                for (i = 0; i < cfi->numchips; i++) {
                        shared[i].writing = shared[i].erasing = NULL;
-                       spin_lock_init(&shared[i].lock);
+                       mutex_init(&shared[i].lock);
                        for (j = 0; j < numparts; j++) {
                                *chip = cfi->chips[i];
                                chip->start += j << partshift;
@@ -886,7 +889,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
                 */
                struct flchip_shared *shared = chip->priv;
                struct flchip *contender;
-               spin_lock(&shared->lock);
+               mutex_lock(&shared->lock);
                contender = shared->writing;
                if (contender && contender != chip) {
                        /*
@@ -899,7 +902,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
                         * get_chip returns success we're clear to go ahead.
                         */
                        ret = mutex_trylock(&contender->mutex);
-                       spin_unlock(&shared->lock);
+                       mutex_unlock(&shared->lock);
                        if (!ret)
                                goto retry;
                        mutex_unlock(&chip->mutex);
@@ -914,7 +917,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
                                mutex_unlock(&contender->mutex);
                                return ret;
                        }
-                       spin_lock(&shared->lock);
+                       mutex_lock(&shared->lock);
 
                        /* We should not own chip if it is already
                         * in FL_SYNCING state. Put contender and retry. */
@@ -930,7 +933,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
                 * on this chip. Sleep. */
                if (mode == FL_ERASING && shared->erasing
                    && shared->erasing->oldstate == FL_ERASING) {
-                       spin_unlock(&shared->lock);
+                       mutex_unlock(&shared->lock);
                        set_current_state(TASK_UNINTERRUPTIBLE);
                        add_wait_queue(&chip->wq, &wait);
                        mutex_unlock(&chip->mutex);
@@ -944,7 +947,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
                shared->writing = chip;
                if (mode == FL_ERASING)
                        shared->erasing = chip;
-               spin_unlock(&shared->lock);
+               mutex_unlock(&shared->lock);
        }
        ret = chip_ready(map, chip, adr, mode);
        if (ret == -EAGAIN)
@@ -959,7 +962,7 @@ static void put_chip(struct map_info *map, struct flchip *chip, unsigned long ad
 
        if (chip->priv) {
                struct flchip_shared *shared = chip->priv;
-               spin_lock(&shared->lock);
+               mutex_lock(&shared->lock);
                if (shared->writing == chip && chip->oldstate == FL_READY) {
                        /* We own the ability to write, but we're done */
                        shared->writing = shared->erasing;
@@ -967,7 +970,7 @@ static void put_chip(struct map_info *map, struct flchip *chip, unsigned long ad
                                /* give back ownership to who we loaned it from */
                                struct flchip *loaner = shared->writing;
                                mutex_lock(&loaner->mutex);
-                               spin_unlock(&shared->lock);
+                               mutex_unlock(&shared->lock);
                                mutex_unlock(&chip->mutex);
                                put_chip(map, loaner, loaner->start);
                                mutex_lock(&chip->mutex);
@@ -985,11 +988,11 @@ static void put_chip(struct map_info *map, struct flchip *chip, unsigned long ad
                         * Don't let the switch below mess things up since
                         * we don't have ownership to resume anything.
                         */
-                       spin_unlock(&shared->lock);
+                       mutex_unlock(&shared->lock);
                        wake_up(&chip->wq);
                        return;
                }
-               spin_unlock(&shared->lock);
+               mutex_unlock(&shared->lock);
        }
 
        switch(chip->oldstate) {
@@ -2139,6 +2142,13 @@ static int cfi_intelext_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
        return ret;
 }
 
+static int cfi_intelext_is_locked(struct mtd_info *mtd, loff_t ofs,
+                                 uint64_t len)
+{
+       return cfi_varsize_frob(mtd, do_getlockstatus_oneblock,
+                               ofs, len, NULL) ? 1 : 0;
+}
+
 #ifdef CONFIG_MTD_OTP
 
 typedef int (*otp_op_t)(struct map_info *map, struct flchip *chip,