On 03/01/2022 05:51, Manivannan Sadhasivam wrote:
On Mon, Jan 03, 2022 at 03:03:15AM +0000, Bryan O'Donoghue wrote:Interacting with a NAND chip on an IPQ6018 I found that the qcomsmem NAND partition parser was returning -EPROBE_DEFER waiting for the main smem driver to load. This caused the board to reset. Playing about with the probe() function shows that the problem lies in the core clock being switched off before the nandc_unalloc() routine has completed. If we look at how qcom_nandc_remove() tears down allocated resources we see the expected order is qcom_nandc_unalloc(nandc); clk_disable_unprepare(nandc->aon_clk); clk_disable_unprepare(nandc->core_clk); dma_unmap_resource(&pdev->dev, nandc->base_dma, resource_size(res), DMA_BIDIRECTIONAL, 0); Tweaking probe() to both bring up and tear-down in that order removes the reset if we end up deferring elsewhere. Fixes: c76b78d8ec05 ("mtd: nand: Qualcomm NAND controller driver") Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>Reviewed-by: Manivannan Sadhasivam <mani@xxxxxxxxxx> Can you please CC stable list for backporting? Thanks, Mani
NP. + cc stable FWIW I believe Greg's scripts will pick up on Fixes: tags automatically
