i3c: mipi-i3c-hci: Factor out DMA mapping from queuing path

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Prepare for fixing a race in the DMA ring enqueue path when handling
parallel transfers.  Move all DMA mapping out of hci_dma_queue_xfer()
and into a new helper that performs the mapping up front.

This refactoring allows the upcoming fix to extend the spinlock coverage
around the enqueue operation without performing DMA mapping under the
spinlock.

No functional change is intended in this patch.

Fixes: 9ad9a52cce ("i3c/master: introduce the mipi-i3c-hci driver")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260306072451.11131-4-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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Adrian Hunter 2026-03-06 09:24:40 +02:00 • committed by Alexandre Belloni

parent fa9586bd77

commit f3bcbfe1b8

1 changed files with 33 additions and 16 deletions

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drivers/i3c/master/mipi-i3c-hci/dma.c

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