[MTD] [OneNAND] Classify the page data and oob buffer

Classify the page data and oob buffer
and it prevents the memory fragementation (writesize + oobsize)

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

2 files changed, 22 insertions, 7 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 6d4e67f6c295..9e14a26ca4e8 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -836,7 +836,7 @@ static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int col
         int readcol = column;
         int readend = column + thislen;
         int lastgap = 0;
-        uint8_t *oob_buf = this->page_buf + mtd->writesize;
+        uint8_t *oob_buf = this->oob_buf;
 
         for (free = this->ecclayout->oobfree; free->length; ++free) {
                 if (readcol >= lastgap)
@@ -1356,7 +1356,7 @@ static int onenand_do_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
         /* Grab the lock and see if the device is available */
         onenand_get_device(mtd, FL_WRITING);
 
-        oobbuf = this->page_buf + mtd->writesize;
+        oobbuf = this->oob_buf;
 
         /* Loop until all data write */
         while (written < len) {
@@ -2332,15 +2332,25 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
         /* Allocate buffers, if necessary */
         if (!this->page_buf) {
-                size_t len;
-                len = mtd->writesize + mtd->oobsize;
-                this->page_buf = kmalloc(len, GFP_KERNEL);
+                this->page_buf = kzalloc(mtd->writesize, GFP_KERNEL);
                 if (!this->page_buf) {
                         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
                         return -ENOMEM;
                 }
                 this->options |= ONENAND_PAGEBUF_ALLOC;
         }
+        if (!this->oob_buf) {
+                this->oob_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
+                if (!this->oob_buf) {
+                        printk(KERN_ERR "onenand_scan(): Can't allocate oob_buf\n");
+                        if (this->options & ONENAND_PAGEBUF_ALLOC) {
+                                this->options &= ~ONENAND_PAGEBUF_ALLOC;
+                                kfree(this->page_buf);
+                        }
+                        return -ENOMEM;
+                }
+                this->options |= ONENAND_OOBBUF_ALLOC;
+        }
 
         this->state = FL_READY;
         init_waitqueue_head(&this->wq);
@@ -2437,9 +2447,11 @@ void onenand_release(struct mtd_info *mtd)
                 kfree(bbm->bbt);
                 kfree(this->bbm);
         }
-        /* Buffer allocated by onenand_scan */
+        /* Buffers allocated by onenand_scan */
         if (this->options & ONENAND_PAGEBUF_ALLOC)
                 kfree(this->page_buf);
+        if (this->options & ONENAND_OOBBUF_ALLOC)
+                kfree(this->oob_buf);
 }
 
 EXPORT_SYMBOL_GPL(onenand_scan);
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index d8af8a95e58d..a56d24ada505 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -82,7 +82,8 @@ struct onenand_bufferram {
  * @wq:                 [INTERN] wait queue to sleep on if a OneNAND
  *                      operation is in progress
  * @state:              [INTERN] the current state of the OneNAND device
- * @page_buf:           data buffer
+ * @page_buf:           [INTERN] page main data buffer
+ * @oob_buf:            [INTERN] page oob data buffer
  * @subpagesize:        [INTERN] holds the subpagesize
  * @ecclayout:          [REPLACEABLE] the default ecc placement scheme
  * @bbm:                [REPLACEABLE] pointer to Bad Block Management
@@ -122,6 +123,7 @@ struct onenand_chip {
         wait_queue_head_t       wq;
         onenand_state_t         state;
         unsigned char           *page_buf;
+        unsigned char           *oob_buf;
 
         int                     subpagesize;
         struct nand_ecclayout   *ecclayout;
@@ -156,6 +158,7 @@ struct onenand_chip {
 #define ONENAND_HAS_CONT_LOCK           (0x0001)
 #define ONENAND_HAS_UNLOCK_ALL          (0x0002)
 #define ONENAND_PAGEBUF_ALLOC           (0x1000)
+#define ONENAND_OOBBUF_ALLOC            (0x2000)
 
 /*
  * OneNAND Flash Manufacturer ID Codes