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dmaengine: ptdma: use consistent DMA masks

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commit df2515a17914ecfc2a0594509deaf7fcb8d191ac upstream.

The PTDMA driver sets DMA masks in two different places for the same
device inconsistently. First call is in pt_pci_probe(), where it uses
48bit mask. The second call is in pt_dmaengine_register(), where it
uses a 64bit mask. Using 64bit dma mask causes IO_PAGE_FAULT errors
on DMA transfers between main memory and other devices.
Without the extra call it works fine. Additionally the second call
doesn't check the return value so it can silently fail.
Remove the superfluous dma_set_mask() call and only use 48bit mask.

Cc: stable@vger.kernel.org
Fixes: b0b4a6b10577 ("dmaengine: ptdma: register PTDMA controller as a DMA resource")
Reviewed-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Tadeusz Struk <tstruk@gigaio.com>
Link: https://lore.kernel.org/r/20240222163053.13842-1-tstruk@gigaio.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tadeusz Struk 2024-02-22 17:30:53 +01:00 committed by Greg Kroah-Hartman
parent 1291d278b5
commit 4e0fe154be
1 changed files with 0 additions and 2 deletions
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2
drivers/dma/ptdma/ptdma-dmaengine.c
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@ -385,8 +385,6 @@ int pt_dmaengine_register(struct pt_device *pt)
chan->vc.desc_free = pt_do_cleanup;
vchan_init(&chan->vc, dma_dev);
dma_set_mask_and_coherent(pt->dev, DMA_BIT_MASK(64));
ret = dma_async_device_register(dma_dev);
if (ret)
goto err_reg;