Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8bacb219018a52e6f02a3cff6a7badf102ddfc44
Commit: 8bacb219018a52e6f02a3cff6a7badf102ddfc44
Parent: 154443c72f47169ebcb3a7befbff0e934c49bff3
Author: Haavard Skinnemoen <[EMAIL PROTECTED]>
AuthorDate: Wed Feb 6 01:38:13 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed Feb 6 10:41:10 2008 -0800
atmel_spi: fix dmachain oops with DEBUG enabled
In atmel_spi_next_xfer, xfer can be NULL because the next transfer may
already have been submitted to the PDC (using DMA chaining). This can
cause an oops, since the debug message assumed it was never null. The
fix changes how those debug messages are issued, ensuring that one is
issued each time a transfer is started instead of once per call.
Also, properly indent the "can this transfer be chained" test so it's
not hidden as if it were non-conditional code.
Signed-off-by: Haavard Skinnemoen <[EMAIL PROTECTED]>
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/spi/atmel_spi.c | 20 ++++++++++++--------
1 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index 545519a..293b7ca 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -198,6 +198,11 @@ static void atmel_spi_next_xfer(struct spi_master *master,
len >>= 1;
spi_writel(as, RCR, len);
spi_writel(as, TCR, len);
+
+ dev_dbg(&msg->spi->dev,
+ " start xfer %p: len %u tx %p/%08x rx %p/%08x\n",
+ xfer, xfer->len, xfer->tx_buf, xfer->tx_dma,
+ xfer->rx_buf, xfer->rx_dma);
} else {
xfer = as->next_transfer;
remaining = as->next_remaining_bytes;
@@ -208,8 +213,8 @@ static void atmel_spi_next_xfer(struct spi_master *master,
if (remaining > 0)
len = remaining;
- else if (!atmel_spi_xfer_is_last(msg, xfer) &&
- atmel_spi_xfer_can_be_chained(xfer)) {
+ else if (!atmel_spi_xfer_is_last(msg, xfer)
+ && atmel_spi_xfer_can_be_chained(xfer)) {
xfer = list_entry(xfer->transfer_list.next,
struct spi_transfer, transfer_list);
len = xfer->len;
@@ -230,6 +235,11 @@ static void atmel_spi_next_xfer(struct spi_master *master,
len >>= 1;
spi_writel(as, RNCR, len);
spi_writel(as, TNCR, len);
+
+ dev_dbg(&msg->spi->dev,
+ " next xfer %p: len %u tx %p/%08x rx %p/%08x\n",
+ xfer, xfer->len, xfer->tx_buf, xfer->tx_dma,
+ xfer->rx_buf, xfer->rx_dma);
} else {
spi_writel(as, RNCR, 0);
spi_writel(as, TNCR, 0);
@@ -246,12 +256,6 @@ static void atmel_spi_next_xfer(struct spi_master *master,
* It should be doable, though. Just not now...
*/
spi_writel(as, IER, SPI_BIT(ENDRX) | SPI_BIT(OVRES));
-
- dev_dbg(&msg->spi->dev,
- " start xfer %p: len %u tx %p/%08x rx %p/%08x imr %03x\n",
- xfer, xfer->len, xfer->tx_buf, xfer->tx_dma,
- xfer->rx_buf, xfer->rx_dma, spi_readl(as, IMR));
-
spi_writel(as, PTCR, SPI_BIT(TXTEN) | SPI_BIT(RXTEN));
}
-
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