From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 18258221554 for ; Tue, 20 Jan 2026 15:04:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768921448; cv=none; b=e5HnUX9OJcIvre1DLpiAwhYBFx4MsLUn2Gxx9nrVIdzs6/+vuyfJL9qvu2RUmf+6BIufWbHWLYyUJfJY1RRl60L8BmzileZpMuwYTy/DsYUzimIRz6C1/Gxf4sRI1UJxP44qPa4Dm1QfoV6TSdi0qbG2m9fmqdn2V7eeDCrsA88= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768921448; c=relaxed/simple; bh=hv8XAjbEe5j4TFkJN0suty36lsJYjdbTWt0E7MptBg0=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=JN7WH9GDn3xZjDLhOhfzI8J6RPGQ/fZxHuftMGN+vfBoIt5/vWOToqI2pbXkRRDv9jWylANvEEFDGVnhdGkh10jrS8u/isjIt0huQknQo4azqzK/r6pAyTkmwETCGiaCt7K5DpRk9TWpCh5du8UbWw3cZzdjoLo0GwbOiRtaPSY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QDisw5IR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QDisw5IR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84E92C16AAE; Tue, 20 Jan 2026 15:04:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768921447; bh=hv8XAjbEe5j4TFkJN0suty36lsJYjdbTWt0E7MptBg0=; h=Subject:To:Cc:From:Date:From; b=QDisw5IR7SmQrRwUSvRn/t15VaXrj5CqTi/ZGxPJUnRpzDF9YEwgIRNDkzc+CaBoi X/uIV9sIVPVnAmA2HLqUpEj9oPr6qfnd7BmMbrTw1LDDm75zFmJHueBice6V+IabIB Fj0ctshkae11kZdye+G/M3o+yoxczS527/+Vfx58= Subject: FAILED: patch "[PATCH] dmaengine: stm32: dmamux: fix device leak on route allocation" failed to apply to 5.15-stable tree To: johan@kernel.org,amelie.delaunay@foss.st.com,pierre-yves.mordret@foss.st.com,vkoul@kernel.org Cc: From: Date: Tue, 20 Jan 2026 16:03:57 +0100 Message-ID: <2026012057-dumpling-bunt-afbb@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x dd6e4943889fb354efa3f700e42739da9bddb6ef # git commit -s git send-email --to '' --in-reply-to '2026012057-dumpling-bunt-afbb@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From dd6e4943889fb354efa3f700e42739da9bddb6ef Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Mon, 17 Nov 2025 17:12:52 +0100 Subject: [PATCH] dmaengine: stm32: dmamux: fix device leak on route allocation Make sure to drop the reference taken when looking up the DMA mux platform device during route allocation. Note that holding a reference to a device does not prevent its driver data from going away so there is no point in keeping the reference. Fixes: df7e762db5f6 ("dmaengine: Add STM32 DMAMUX driver") Cc: stable@vger.kernel.org # 4.15 Cc: Pierre-Yves MORDRET Signed-off-by: Johan Hovold Reviewed-by: Amelie Delaunay Link: https://patch.msgid.link/20251117161258.10679-11-johan@kernel.org Signed-off-by: Vinod Koul diff --git a/drivers/dma/stm32/stm32-dmamux.c b/drivers/dma/stm32/stm32-dmamux.c index 8d77e2a7939a..791179760782 100644 --- a/drivers/dma/stm32/stm32-dmamux.c +++ b/drivers/dma/stm32/stm32-dmamux.c @@ -90,23 +90,25 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, struct stm32_dmamux_data *dmamux = platform_get_drvdata(pdev); struct stm32_dmamux *mux; u32 i, min, max; - int ret; + int ret = -EINVAL; unsigned long flags; if (dma_spec->args_count != 3) { dev_err(&pdev->dev, "invalid number of dma mux args\n"); - return ERR_PTR(-EINVAL); + goto err_put_pdev; } if (dma_spec->args[0] > dmamux->dmamux_requests) { dev_err(&pdev->dev, "invalid mux request number: %d\n", dma_spec->args[0]); - return ERR_PTR(-EINVAL); + goto err_put_pdev; } mux = kzalloc(sizeof(*mux), GFP_KERNEL); - if (!mux) - return ERR_PTR(-ENOMEM); + if (!mux) { + ret = -ENOMEM; + goto err_put_pdev; + } spin_lock_irqsave(&dmamux->lock, flags); mux->chan_id = find_first_zero_bit(dmamux->dma_inuse, @@ -133,7 +135,6 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", i - 1); if (!dma_spec->np) { dev_err(&pdev->dev, "can't get dma master\n"); - ret = -EINVAL; goto error; } @@ -160,6 +161,8 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, dev_dbg(&pdev->dev, "Mapping DMAMUX(%u) to DMA%u(%u)\n", mux->request, mux->master, mux->chan_id); + put_device(&pdev->dev); + return mux; error: @@ -167,6 +170,9 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, error_chan_id: kfree(mux); +err_put_pdev: + put_device(&pdev->dev); + return ERR_PTR(ret); }