In current driver, we always copy 4 bytes to the dest memory. Actually the dest memory may be shorter than 4 bytes. Add an argument to indicate the dest memory length. Avoid writing memory outside of the bounds.
Signed-off-by: Gong Qianyu Qianyu.Gong@freescale.com --- V2: - New Patch.
drivers/spi/fsl_qspi.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c index 1278981..b6b9e91 100644 --- a/drivers/spi/fsl_qspi.c +++ b/drivers/spi/fsl_qspi.c @@ -637,7 +637,7 @@ static void qspi_op_write(struct fsl_qspi_priv *priv, u8 *txbuf, u32 len) qspi_write32(priv->flags, ®s->mcr, mcr_reg); }
-static void qspi_op_rdsr(struct fsl_qspi_priv *priv, u32 *rxbuf) +static void qspi_op_rdsr(struct fsl_qspi_priv *priv, void *rxbuf, u32 len) { struct fsl_qspi_regs *regs = priv->regs; u32 mcr_reg, reg, data; @@ -660,7 +660,7 @@ static void qspi_op_rdsr(struct fsl_qspi_priv *priv, u32 *rxbuf) if (reg & QSPI_RBSR_RDBFL_MASK) { data = qspi_read32(priv->flags, ®s->rbdr[0]); data = qspi_endian_xchg(data); - memcpy(rxbuf, &data, 4); + memcpy(rxbuf, &data, len); qspi_write32(priv->flags, ®s->mcr, qspi_read32(priv->flags, ®s->mcr) | QSPI_MCR_CLR_RXF_MASK); @@ -749,7 +749,7 @@ int qspi_xfer(struct fsl_qspi_priv *priv, unsigned int bitlen, } else if (priv->cur_seqid == QSPI_CMD_RDID) qspi_op_rdid(priv, din, bytes); else if (priv->cur_seqid == QSPI_CMD_RDSR) - qspi_op_rdsr(priv, din); + qspi_op_rdsr(priv, din, bytes); #ifdef CONFIG_SPI_FLASH_BAR else if ((priv->cur_seqid == QSPI_CMD_BRRD) || (priv->cur_seqid == QSPI_CMD_RDEAR)) {