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spi: fsl_qspi: Fix qspi_op_rdid memcpy issue

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In current driver everytime we memcpy 4 bytes to the dest memory
regardless of the remaining length.
This patch adds checking the remaining length before memcpy.
If the length is shorter than 4 bytes, memcpy the actual length of data
to the dest memory.

Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Gong Qianyu 2016-01-26 15:06:40 +08:00 committed by York Sun
parent c2a4cb17b4
commit 5207014deb
1 changed files with 6 additions and 6 deletions
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12
drivers/spi/fsl_qspi.c
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@ -477,8 +477,8 @@ static void qspi_op_rdbank(struct fsl_qspi_priv *priv, u8 *rxbuf, u32 len)
static void qspi_op_rdid(struct fsl_qspi_priv *priv, u32 *rxbuf, u32 len)
{
struct fsl_qspi_regs *regs = priv->regs;
u32 mcr_reg, rbsr_reg, data;
int i, size;
u32 mcr_reg, rbsr_reg, data, size;
int i;
mcr_reg = qspi_read32(priv->flags, &regs->mcr);
qspi_write32(priv->flags, &regs->mcr,
@ -494,15 +494,15 @@ static void qspi_op_rdid(struct fsl_qspi_priv *priv, u32 *rxbuf, u32 len)
;
i = 0;
size = len;
while ((RX_BUFFER_SIZE >= size) && (size > 0)) {
while ((RX_BUFFER_SIZE >= len) && (len > 0)) {
rbsr_reg = qspi_read32(priv->flags, &regs->rbsr);
if (rbsr_reg & QSPI_RBSR_RDBFL_MASK) {
data = qspi_read32(priv->flags, &regs->rbdr[i]);
data = qspi_endian_xchg(data);
memcpy(rxbuf, &data, 4);
size = (len < 4) ? len : 4;
memcpy(rxbuf, &data, size);
len -= size;
rxbuf++;
size -= 4;
i++;
}
}