diff options
Diffstat (limited to 'nuttx/drivers/mtd/rammtd.c')
| -rw-r--r-- | nuttx/drivers/mtd/rammtd.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/nuttx/drivers/mtd/rammtd.c b/nuttx/drivers/mtd/rammtd.c index 5bdfa5017..6a2e1f4c2 100644 --- a/nuttx/drivers/mtd/rammtd.c +++ b/nuttx/drivers/mtd/rammtd.c @@ -168,20 +168,22 @@ static ssize_t ram_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nbl { FAR struct ram_dev_s *priv = (FAR struct ram_dev_s *)dev; off_t offset; + off_t maxblock; size_t nbytes; DEBUGASSERT(dev && buf); /* Don't let the read exceed the size of the ram buffer */ - if (startblock >= priv->nblocks) + maxblock = priv->nblocks * CONFIG_RAMMTD_BLKPER; + if (startblock >= maxblock) { return 0; } - if (startblock + nblocks >= priv->nblocks) + if (startblock + nblocks > maxblock) { - nblocks = priv->nblocks - nblocks; + nblocks = maxblock - startblock; } /* Get the offset corresponding to the first block and the size @@ -201,25 +203,27 @@ static ssize_t ram_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nbl * Name: ram_bwrite ****************************************************************************/ -static ssize_t ram_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks, - FAR const uint8_t *buf) +static ssize_t ram_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, + size_t nblocks, FAR const uint8_t *buf) { FAR struct ram_dev_s *priv = (FAR struct ram_dev_s *)dev; off_t offset; + off_t maxblock; size_t nbytes; DEBUGASSERT(dev && buf); /* Don't let the write exceed the size of the ram buffer */ - if (startblock >= priv->nblocks) + maxblock = priv->nblocks * CONFIG_RAMMTD_BLKPER; + if (startblock >= maxblock) { return 0; } - if (startblock + nblocks >= priv->nblocks) + if (startblock + nblocks > maxblock) { - nblocks = priv->nblocks - nblocks; + nblocks = maxblock - startblock; } /* Get the offset corresponding to the first block and the size |