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 when using mem-to-mem copy. Changes from v2: 1) Fix commit subject and commit log to mention bchan/rchan/tchan to NULL suggested by Peter. 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@xxxxxx v2 => https://lore.kernel.org/r/20211027055625.11150-1-kishon@xxxxxx Kishon Vijay Abraham I (2): dmaengine: ti: k3-udma: Set bchan to NULL if a channel request fail dmaengine: ti: k3-udma: Set rchan/tchan to NULL if a channel request fail drivers/dma/ti/k3-udma.c | 32 ++++++++++++++++++++++++++------ 1 file changed, 26 insertions(+), 6 deletions(-) -- 2.17.1
