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path: root/drivers/mtd/mtdblock.c
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Diffstat (limited to 'drivers/mtd/mtdblock.c')
-rw-r--r--drivers/mtd/mtdblock.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index 208c6faa0358..77db5ce24d92 100644
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -29,6 +29,8 @@ static struct mtdblk_dev {
29 enum { STATE_EMPTY, STATE_CLEAN, STATE_DIRTY } cache_state; 29 enum { STATE_EMPTY, STATE_CLEAN, STATE_DIRTY } cache_state;
30} *mtdblks[MAX_MTD_DEVICES]; 30} *mtdblks[MAX_MTD_DEVICES];
31 31
32static struct mutex mtdblks_lock;
33
32/* 34/*
33 * Cache stuff... 35 * Cache stuff...
34 * 36 *
@@ -270,15 +272,19 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd)
270 272
271 DEBUG(MTD_DEBUG_LEVEL1,"mtdblock_open\n"); 273 DEBUG(MTD_DEBUG_LEVEL1,"mtdblock_open\n");
272 274
275 mutex_lock(&mtdblks_lock);
273 if (mtdblks[dev]) { 276 if (mtdblks[dev]) {
274 mtdblks[dev]->count++; 277 mtdblks[dev]->count++;
278 mutex_unlock(&mtdblks_lock);
275 return 0; 279 return 0;
276 } 280 }
277 281
278 /* OK, it's not open. Create cache info for it */ 282 /* OK, it's not open. Create cache info for it */
279 mtdblk = kzalloc(sizeof(struct mtdblk_dev), GFP_KERNEL); 283 mtdblk = kzalloc(sizeof(struct mtdblk_dev), GFP_KERNEL);
280 if (!mtdblk) 284 if (!mtdblk) {
285 mutex_unlock(&mtdblks_lock);
281 return -ENOMEM; 286 return -ENOMEM;
287 }
282 288
283 mtdblk->count = 1; 289 mtdblk->count = 1;
284 mtdblk->mtd = mtd; 290 mtdblk->mtd = mtd;
@@ -291,6 +297,7 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd)
291 } 297 }
292 298
293 mtdblks[dev] = mtdblk; 299 mtdblks[dev] = mtdblk;
300 mutex_unlock(&mtdblks_lock);
294 301
295 DEBUG(MTD_DEBUG_LEVEL1, "ok\n"); 302 DEBUG(MTD_DEBUG_LEVEL1, "ok\n");
296 303
@@ -304,6 +311,8 @@ static int mtdblock_release(struct mtd_blktrans_dev *mbd)
304 311
305 DEBUG(MTD_DEBUG_LEVEL1, "mtdblock_release\n"); 312 DEBUG(MTD_DEBUG_LEVEL1, "mtdblock_release\n");
306 313
314 mutex_lock(&mtdblks_lock);
315
307 mutex_lock(&mtdblk->cache_mutex); 316 mutex_lock(&mtdblk->cache_mutex);
308 write_cached_data(mtdblk); 317 write_cached_data(mtdblk);
309 mutex_unlock(&mtdblk->cache_mutex); 318 mutex_unlock(&mtdblk->cache_mutex);
@@ -316,6 +325,9 @@ static int mtdblock_release(struct mtd_blktrans_dev *mbd)
316 vfree(mtdblk->cache_data); 325 vfree(mtdblk->cache_data);
317 kfree(mtdblk); 326 kfree(mtdblk);
318 } 327 }
328
329 mutex_unlock(&mtdblks_lock);
330
319 DEBUG(MTD_DEBUG_LEVEL1, "ok\n"); 331 DEBUG(MTD_DEBUG_LEVEL1, "ok\n");
320 332
321 return 0; 333 return 0;
@@ -376,6 +388,8 @@ static struct mtd_blktrans_ops mtdblock_tr = {
376 388
377static int __init init_mtdblock(void) 389static int __init init_mtdblock(void)
378{ 390{
391 mutex_init(&mtdblks_lock);
392
379 return register_mtd_blktrans(&mtdblock_tr); 393 return register_mtd_blktrans(&mtdblock_tr);
380} 394}
381 395