From: Fan Wu Date: Fri, 31 Jul 2026 08:59:15 +0000 (+0000) Subject: serial: amba-pl011: synchronize DMA teardown X-Git-Tag: v7.2-rc7~6^2 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=440915499231e9db1c361aa45bb702e8fd3b4a32;p=thirdparty%2Flinux.git serial: amba-pl011: synchronize DMA teardown dmaengine_terminate_all() does not wait for a running callback, so the TX callback can still touch the TX buffer after it is freed. The RX poll timer reads the RX buffers without the port lock. Switch to dmaengine_terminate_sync() and delete the RX timer before freeing the buffers. Fixes: ead76f329f77 ("ARM: 6763/1: pl011: add optional RX DMA to PL011 v2") Cc: stable Assisted-by: Codex:gpt-5.6 Signed-off-by: Fan Wu Link: https://patch.msgid.link/20260731085915.326775-4-fanwu01@zju.edu.cn Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 5232042fdd92..9abaeecd05fc 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -1247,7 +1247,7 @@ static void pl011_dma_shutdown(struct uart_amba_port *uap) if (uap->using_tx_dma) { /* In theory, this should already be done by pl011_dma_flush_buffer */ - dmaengine_terminate_all(uap->dmatx.chan); + dmaengine_terminate_sync(uap->dmatx.chan); if (uap->dmatx.queued) { dma_unmap_single(uap->dmatx.chan->device->dev, uap->dmatx.dma, uap->dmatx.len, @@ -1260,12 +1260,12 @@ static void pl011_dma_shutdown(struct uart_amba_port *uap) } if (uap->using_rx_dma) { - dmaengine_terminate_all(uap->dmarx.chan); + if (uap->dmarx.poll_rate) + timer_delete_sync(&uap->dmarx.timer); + dmaengine_terminate_sync(uap->dmarx.chan); /* Clean up the RX DMA */ pl011_dmabuf_free(uap->dmarx.chan, &uap->dmarx.dbuf_a, DMA_FROM_DEVICE); pl011_dmabuf_free(uap->dmarx.chan, &uap->dmarx.dbuf_b, DMA_FROM_DEVICE); - if (uap->dmarx.poll_rate) - timer_delete_sync(&uap->dmarx.timer); uap->using_rx_dma = false; } }