diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2017-09-11 02:41:54 -0700 |
|---|---|---|
| committer | Cyrille Pitchen <cyrille.pitchen@wedev4u.fr> | 2017-10-11 09:43:13 +0200 |
| commit | db2ce7f3c7b01a6a3611fb8e0bfa453dec168a47 (patch) | |
| tree | df5ef4a1c38c78ed37576ff6813cd19e9ccfd137 /drivers/mtd | |
| parent | 9d63f17661e25fd28714dac94bdebc4ff5b75f09 (diff) | |
spi-nor: intel-spi: Check transfer length in the HW/SW cycle
Intel SPI controller only has a 64 bytes FIFO. This adds a sanity
check before triggering any HW/SW sequencer work.
Additionally for the SW sequencer, if given data length is zero,
we should not mark the 'Data Cycle' bit.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/spi-nor/intel-spi.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/mtd/spi-nor/intel-spi.c b/drivers/mtd/spi-nor/intel-spi.c index 263c6ab5849a..c4a9de6b8045 100644 --- a/drivers/mtd/spi-nor/intel-spi.c +++ b/drivers/mtd/spi-nor/intel-spi.c @@ -399,6 +399,9 @@ static int intel_spi_hw_cycle(struct intel_spi *ispi, u8 opcode, int len) return -EINVAL; } + if (len > INTEL_SPI_FIFO_SZ) + return -EINVAL; + val |= (len - 1) << HSFSTS_CTL_FDBC_SHIFT; val |= HSFSTS_CTL_FCERR | HSFSTS_CTL_FDONE; val |= HSFSTS_CTL_FGO; @@ -419,14 +422,19 @@ static int intel_spi_hw_cycle(struct intel_spi *ispi, u8 opcode, int len) static int intel_spi_sw_cycle(struct intel_spi *ispi, u8 opcode, int len) { - u32 val, status; + u32 val = 0, status; int ret; ret = intel_spi_opcode_index(ispi, opcode); if (ret < 0) return ret; - val = ((len - 1) << SSFSTS_CTL_DBC_SHIFT) | SSFSTS_CTL_DS; + if (len > INTEL_SPI_FIFO_SZ) + return -EINVAL; + + /* Only mark 'Data Cycle' bit when there is data to be transferred */ + if (len > 0) + val = ((len - 1) << SSFSTS_CTL_DBC_SHIFT) | SSFSTS_CTL_DS; val |= ret << SSFSTS_CTL_COP_SHIFT; val |= SSFSTS_CTL_FCERR | SSFSTS_CTL_FDONE; val |= SSFSTS_CTL_SCGO; |