The patch titled
mmc: atmel-mci: prevent kernel oops while removing card
has been added to the -mm tree. Its filename is
mmc-atmel-mci-prevent-kernel-oops-while-removing-card.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mmc: atmel-mci: prevent kernel oops while removing card
From: Nicolas Ferre <[email protected]>
The removing of an SD card in certain circumstances can lead to a kernel
oops if we do not make sure that the "data" field of the host structure is
valid. This patch adds a test in atmci_dma_cleanup() function and also
calls atmci_stop_dma() before throwing away the reference to data.
Signed-off-by: Nicolas Ferre <[email protected]>
Cc: Haavard Skinnemoen <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
drivers/mmc/host/atmel-mci.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff -puN
drivers/mmc/host/atmel-mci.c~mmc-atmel-mci-prevent-kernel-oops-while-removing-card
drivers/mmc/host/atmel-mci.c
---
a/drivers/mmc/host/atmel-mci.c~mmc-atmel-mci-prevent-kernel-oops-while-removing-card
+++ a/drivers/mmc/host/atmel-mci.c
@@ -569,9 +569,10 @@ static void atmci_dma_cleanup(struct atm
{
struct mmc_data *data = host->data;
- dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len,
- ((data->flags & MMC_DATA_WRITE)
- ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
+ if (data)
+ dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len,
+ ((data->flags & MMC_DATA_WRITE)
+ ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
}
static void atmci_stop_dma(struct atmel_mci *host)
@@ -1113,8 +1114,8 @@ static void atmci_command_complete(struc
"command error: status=0x%08x\n", status);
if (cmd->data) {
- host->data = NULL;
atmci_stop_dma(host);
+ host->data = NULL;
mci_writel(host, IDR, MCI_NOTBUSY
| MCI_TXRDY | MCI_RXRDY
| ATMCI_DATA_ERROR_FLAGS);
_
Patches currently in -mm which might be from [email protected] are
linux-next.patch
mmc-atmel-mci-enable-sd-high-speed-support.patch
mmc-atmel-mci-fix-two-parameters-swapped.patch
mmc-atmel-mci-prevent-kernel-oops-while-removing-card.patch
mmc-atmel-mci-remove-data-error-interrupt-after-xfer.patch
mmc-atmel-mci-add-support-for-sdio-interrupts.patch
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