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

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commit f3bcbfe1b8 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Adrian Hunter 2026-03-06 09:24:40 +02:00 • committed by Greg Kroah-Hartman

parent 478a99a961

commit 74a4f77bbf

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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