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charset="UTF-8" Unbinding the crypto BAM through sysfs on X1P42100 resets the board. bam_dma_remove() clears BAM_IRQ_SRCS_MSK_EE unconditionally. For a BAM that is controlled or powered remotely the register may not be accessible: the clock and power of the block belong to the remote side or to the consumer of the BAM, which is why bam_init() already avoids every register access for such a BAM when the DT provides num-channels and qcom,num-ees. The write is also unnecessary. On a remotely controlled BAM the driver only ever sets per channel bits in the EE mask, in bam_chan_init_hw(), and bam_free_chan() clears them again. Both run on behalf of a consumer, which keeps the block clocked while they do. Skip the write for both kinds of remotely managed BAM, using the same condition as bam_init(). Fixes: 5172c9eb89d4 ("dmaengine: qcom: bam_dma: add controlled-remotely dt property") Reviewed-by: Bartosz Golaszewski Reviewed-by: Frank Li Signed-off-by: Mostafa Saleh --- drivers/dma/qcom/bam_dma.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c index 8a1f4e5d24d1..e01f0fec1599 100644 --- a/drivers/dma/qcom/bam_dma.c +++ b/drivers/dma/qcom/bam_dma.c @@ -1407,8 +1407,15 @@ static void bam_dma_remove(struct platform_device *pdev) dma_async_device_unregister(&bdev->common); pm_runtime_get_sync(&pdev->dev); - /* mask all interrupts for this execution environment */ - writel_relaxed(0, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); + + /* + * Mask all interrupts for this execution environment. A remotely + * controlled or powered BAM is left alone: it may be unclocked, and + * the only bits this driver sets in its mask are the per channel + * ones that bam_free_chan() cleared. + */ + if (!bdev->controlled_remotely && !bdev->powered_remotely) + writel_relaxed(0, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); free_irq(bdev->irq, bdev); -- 2.56.0.611.g1030f0b940-goog