diff options
Diffstat (limited to 'drivers/block/z2ram.c')
| -rw-r--r-- | drivers/block/z2ram.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c index 9114654b54d9..a22e3f895947 100644 --- a/drivers/block/z2ram.c +++ b/drivers/block/z2ram.c @@ -33,6 +33,7 @@ #include <linux/module.h> #include <linux/blkdev.h> #include <linux/bitops.h> +#include <linux/mutex.h> #include <linux/slab.h> #include <asm/setup.h> @@ -56,6 +57,7 @@ extern struct mem_info m68k_memory[NUM_MEMINFO]; #define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 ) +static DEFINE_MUTEX(z2ram_mutex); static u_long *z2ram_map = NULL; static u_long z2ram_size = 0; static int z2_count = 0; @@ -78,8 +80,10 @@ static void do_z2_request(struct request_queue *q) int err = 0; if (start + len > z2ram_size) { - printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n", - blk_rq_pos(req), blk_rq_cur_sectors(req)); + pr_err(DEVICE_NAME ": bad access: block=%llu, " + "count=%u\n", + (unsigned long long)blk_rq_pos(req), + blk_rq_cur_sectors(req)); err = -EIO; goto done; } @@ -153,6 +157,7 @@ static int z2_open(struct block_device *bdev, fmode_t mode) device = MINOR(bdev->bd_dev); + mutex_lock(&z2ram_mutex); if ( current_device != -1 && current_device != device ) { rc = -EBUSY; @@ -294,20 +299,25 @@ static int z2_open(struct block_device *bdev, fmode_t mode) set_capacity(z2ram_gendisk, z2ram_size >> 9); } + mutex_unlock(&z2ram_mutex); return 0; err_out_kfree: kfree(z2ram_map); err_out: + mutex_unlock(&z2ram_mutex); return rc; } static int z2_release(struct gendisk *disk, fmode_t mode) { - if ( current_device == -1 ) - return 0; - + mutex_lock(&z2ram_mutex); + if ( current_device == -1 ) { + mutex_unlock(&z2ram_mutex); + return 0; + } + mutex_unlock(&z2ram_mutex); /* * FIXME: unmap memory */ |