* [PATCH] OMAP: McSPI: catch xfers of non-multiple SPI word size
@ 2011-02-25 15:55 Michael Jones
2011-03-05 5:26 ` Grant Likely
0 siblings, 1 reply; 2+ messages in thread
From: Michael Jones @ 2011-02-25 15:55 UTC (permalink / raw)
To: linux-omap, spi-devel-general
If an SPI access was not a multiple of the SPI word size,
the while() loop would spin and the rx/tx ptrs would be incremented
indefinitely.
Signed-off-by: Michael Jones <michael.jones@matrix-vision.de>
---
drivers/spi/omap2_mcspi.c | 9 ++++++---
1 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
index abb1ffb..9e439be 100644
--- a/drivers/spi/omap2_mcspi.c
+++ b/drivers/spi/omap2_mcspi.c
@@ -487,6 +487,9 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
rx_reg = base + OMAP2_MCSPI_RX0;
chstat_reg = base + OMAP2_MCSPI_CHSTAT0;
+ if (c < (word_len>>3))
+ return 0;
+
if (word_len <= 8) {
u8 *rx;
const u8 *tx;
@@ -534,7 +537,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
dev_vdbg(&spi->dev, "read-%d %02x\n",
word_len, *(rx - 1));
}
- } while (c);
+ } while (c > (word_len>>3));
} else if (word_len <= 16) {
u16 *rx;
const u16 *tx;
@@ -581,7 +584,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
dev_vdbg(&spi->dev, "read-%d %04x\n",
word_len, *(rx - 1));
}
- } while (c);
+ } while (c > (word_len>>3));
} else if (word_len <= 32) {
u32 *rx;
const u32 *tx;
@@ -628,7 +631,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
dev_vdbg(&spi->dev, "read-%d %08x\n",
word_len, *(rx - 1));
}
- } while (c);
+ } while (c > (word_len>>3));
}
/* for TX_ONLY mode, be sure all words have shifted out */
--
1.7.4.1
MATRIX VISION GmbH, Talstrasse 16, DE-71570 Oppenweiler
Registergericht: Amtsgericht Stuttgart, HRB 271090
Geschaeftsfuehrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] OMAP: McSPI: catch xfers of non-multiple SPI word size
2011-02-25 15:55 [PATCH] OMAP: McSPI: catch xfers of non-multiple SPI word size Michael Jones
@ 2011-03-05 5:26 ` Grant Likely
0 siblings, 0 replies; 2+ messages in thread
From: Grant Likely @ 2011-03-05 5:26 UTC (permalink / raw)
To: Michael Jones; +Cc: linux-omap, spi-devel-general
On Fri, Feb 25, 2011 at 04:55:11PM +0100, Michael Jones wrote:
> If an SPI access was not a multiple of the SPI word size,
> the while() loop would spin and the rx/tx ptrs would be incremented
> indefinitely.
>
> Signed-off-by: Michael Jones <michael.jones@matrix-vision.de>
Applied, thanks.
g.
> ---
> drivers/spi/omap2_mcspi.c | 9 ++++++---
> 1 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
> index abb1ffb..9e439be 100644
> --- a/drivers/spi/omap2_mcspi.c
> +++ b/drivers/spi/omap2_mcspi.c
> @@ -487,6 +487,9 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
> rx_reg = base + OMAP2_MCSPI_RX0;
> chstat_reg = base + OMAP2_MCSPI_CHSTAT0;
>
> + if (c < (word_len>>3))
> + return 0;
> +
> if (word_len <= 8) {
> u8 *rx;
> const u8 *tx;
> @@ -534,7 +537,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
> dev_vdbg(&spi->dev, "read-%d %02x\n",
> word_len, *(rx - 1));
> }
> - } while (c);
> + } while (c > (word_len>>3));
> } else if (word_len <= 16) {
> u16 *rx;
> const u16 *tx;
> @@ -581,7 +584,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
> dev_vdbg(&spi->dev, "read-%d %04x\n",
> word_len, *(rx - 1));
> }
> - } while (c);
> + } while (c > (word_len>>3));
> } else if (word_len <= 32) {
> u32 *rx;
> const u32 *tx;
> @@ -628,7 +631,7 @@ omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
> dev_vdbg(&spi->dev, "read-%d %08x\n",
> word_len, *(rx - 1));
> }
> - } while (c);
> + } while (c > (word_len>>3));
> }
>
> /* for TX_ONLY mode, be sure all words have shifted out */
> --
> 1.7.4.1
>
>
> MATRIX VISION GmbH, Talstrasse 16, DE-71570 Oppenweiler
> Registergericht: Amtsgericht Stuttgart, HRB 271090
> Geschaeftsfuehrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner
>
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2011-03-05 5:26 ` Grant Likely
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