From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ECB92339394; Sat, 19 Sep 2026 22:22:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789856546; cv=none; b=MMpW/pwxSLqYV/cC8KSegJdW01S9zlk5bVyvbwD1Y1WDfrsPXAeFivNzrrSTE1KuvBpsXm2utO4Szu2M7uVI9lVbPlR8+sYF9rjuIDC1qytRvkXBzL5Xo5eqfVklmcoq7eCT7MzGb1hiqh/ZwU7MdndKLVczaYsr9Jpu7Q9fI5k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789856546; c=relaxed/simple; bh=FRJJ17BnZMUpcAIcGybL2R4uzHv0U9E8sP/F/EeyR7I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=sTKMza+xYg2AM+xSAJ+dPkinimzy1k80B/dgZjzmpkoBNizE0Q9rO0uMFcCgVhPu13YkLPZfzTypa/AmpNj5Gu47YtzNKgfDJ+TVWxIR6pqqNcNh8hvfKkD/lh1XrvDc32H5d7PCZ0fp7BojlAS96GcOmSQ5/jp96X2at/aLrac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=G18vBYn5; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="G18vBYn5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 587281F000FF; Sat, 19 Sep 2026 22:22:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789856544; bh=hMP849a+sIC4F4CSaa2afCsMvyj8u4Dw2PEwfMEmKYg=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=G18vBYn5jyWcRgia+vZ+LyhyS0nDAaw3AYzynfNHqhtGfP0DJ9Fe2c9oB5u1qcXP4 jULO4nUCsKQbKz4pzzXTcs4Pri0Rmv3Dt9k5a87D8sEou77SUJ9eBulM4U4tASodYR LxK0QKDEEG5iJSdfmT1putbt9eDRb3gzoLJ6t/QmRaHbJchps8SW43W0T00/B63Oif PeFAOLZSmJuwo27+EcjhNdDo5nzN+Hk8Qy8IJFOTi8kolI35WT5nUrVeWiD17HGD6b K0fs3qp8yRdwnZKOtFFcVipvaHDw4/NMfjJOCUhEka3GcLqvY9dwSwoVp5ECHx0C99 9yNvKA+24A5Yw== From: Linus Walleij Date: Sun, 20 Sep 2026 00:22:15 +0200 Subject: [PATCH v4 04/23] dmaengine: ste_dma40: Fix failed start cleanup Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260920-dma40-fixes-v4-4-d751b2d9c23f@kernel.org> References: <20260920-dma40-fixes-v4-0-d751b2d9c23f@kernel.org> In-Reply-To: <20260920-dma40-fixes-v4-0-d751b2d9c23f@kernel.org> To: Vinod Koul , Frank Li Cc: dmaengine@vger.kernel.org, phone-devel@vger.kernel.org, Linus Walleij , sashiko-bot@kernel.org X-Mailer: b4 0.14.3 If d40_start() fails after a queued descriptor has been moved to the active list, d40_queue_start() currently returns NULL without unwinding the transfer state or clearing the channel busy flag. Fix this pre-existing error path by completing the descriptor through the normal tasklet path, clearing the busy flag, balancing the runtime PM reference and returning an error pointer to distinguish the failure from the no-work case. Do not free the descriptor directly, since it has already been submitted and has a DMA cookie. When starting the next queued transfer from the completion handler, put the completed descriptor on the done list first. This preserves FIFO completion order if the new transfer fails to start and prevents the completed cookie from moving backwards. Use done-list membership rather than the cyclic flag to identify terminal descriptors in the tasklet. A cyclic descriptor that failed to start is then completed and removed instead of remaining permanently at the head of the done list. Fixes: 7d83a854a1a4 ("dma40: remove "hardware link with previous jobs" code") Reported-by: sashiko-bot@kernel.org Closes: https://lore.kernel.org/dmaengine/20260618051539.15E201F000E9@smtp.kernel.org/ Assisted-by: LLM Signed-off-by: Linus Walleij --- drivers/dma/ste_dma40.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index b992471e05f2..4591da863398 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -1633,8 +1633,15 @@ static struct d40_desc *d40_queue_start(struct d40_chan *d40c) /* Start dma job */ err = d40_start(d40c); - if (err) - return NULL; + if (err) { + d40_desc_remove(d40d); + d40_desc_done(d40c, d40d); + d40c->pending_tx++; + d40c->busy = false; + pm_runtime_put_autosuspend(d40c->base->dev); + tasklet_schedule(&d40c->tasklet); + return ERR_PTR(err); + } } return d40d; @@ -1681,14 +1688,14 @@ static void dma_tc_handle(struct d40_chan *d40c) return; } + d40_desc_remove(d40d); + d40_desc_done(d40c, d40d); + if (d40_queue_start(d40c) == NULL) { d40c->busy = false; pm_runtime_put_autosuspend(d40c->base->dev); } - - d40_desc_remove(d40d); - d40_desc_done(d40c, d40d); } d40c->pending_tx += callbacks; @@ -1702,20 +1709,22 @@ static void dma_tasklet(struct tasklet_struct *t) struct d40_desc *d40d; unsigned long flags; bool callback_active; + bool from_done; struct dmaengine_desc_callback cb; spin_lock_irqsave(&d40c->lock, flags); /* Get first entry from the done list */ d40d = d40_first_done(d40c); - if (d40d == NULL) { + from_done = !!d40d; + if (!from_done) { /* Check if we have reached here for cyclic job */ d40d = d40_first_active_get(d40c); if (d40d == NULL || !d40d->cyclic) goto check_pending_tx; } - if (!d40d->cyclic) + if (from_done) dma_cookie_complete(&d40d->txd); /* @@ -1731,7 +1740,7 @@ static void dma_tasklet(struct tasklet_struct *t) callback_active = !!(d40d->txd.flags & DMA_PREP_INTERRUPT); dmaengine_desc_get_callback(&d40d->txd, &cb); - if (!d40d->cyclic) { + if (from_done) { if (async_tx_test_ack(&d40d->txd)) { d40_desc_remove(d40d); d40_desc_free(d40c, d40d); -- 2.55.0