dmaengine: sh: rz-dmac: Fix off-by-one in residue lmdesc lookup

lmdesc->nxla is the address of the next descriptor, so comparing it
against CRLA, which is the address of the current descriptor,
finds the descriptor before the active one, not the active one.
The residue loops below then summed one lmdesc too many on top of
that.

Compare each descriptor's own address to CRLA instead, and add tb
after advancing to the next lmdesc.

Fixes: 21323b118c16 ("dmaengine: sh: rz-dmac: Add device_tx_status() callback")
Fixes: 172bfb57481c ("dmaengine: sh: rz-dmac: Add cyclic DMA support")
Cc: stable@vger.kernel.org
Suggested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260922092037.224884-1-claudiu.beznea@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

0 files changed, 0 insertions, 0 deletions