Messages in this thread | | | Date | Wed, 27 Oct 2021 11:45:16 +0300 | From | Péter Ujfalusi <> | Subject | Re: [RESEND PATCH v2 0/2] dmaengine: ti: k3-udma: Fix NULL pointer dereference error |
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Hi Kishon,
On 27/10/2021 08:56, Kishon Vijay Abraham I wrote: > NULL pointer de-reference error was observed when all the PCIe endpoint > functions (22 function in J721E) request a DMA channel. The issue was > specfically observed in BCDMA (Block copy DMA) but the issue is > applicable in PKTDMA as well.
Nice catch, interesting that it did not materialized before.
Can you re-word the patch subjects and commit messages accordingly?
This is not really BCDMA/PKTDMA issue but a missed uc->Xchan = NULL; which would cause the de-reference error.
> Changes from v1: > 1) Split the patch for BCDMA and PKTDMA separately > 2) Fixed the return value of udma_get_rflow() to 0. > 3) Removed the fixes tag as the patches does not directly apply to the > commits. > > v1 => https://lore.kernel.org/r/20210209090036.30832-1-kishon@ti.com > > Kishon Vijay Abraham I (2): > dmaengine: ti: k3-udma: Fix NULL pointer dereference error for BCDMA
dmaengine: ti: k3-udma: Set bchan to NULL if a channel request fail
> dmaengine: ti: k3-udma: Fix NULL pointer dereference error for PKTDMA
dmaengine: ti: k3-udma: Set rchan/tchan to NULL if a channel request fail
This is also applicable for UDMA which only have rchan and tchan.
> > drivers/dma/ti/k3-udma.c | 32 ++++++++++++++++++++++++++------ > 1 file changed, 26 insertions(+), 6 deletions(-) >
-- Péter
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