From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:54754 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1424833AbeCBJCO (ORCPT ); Fri, 2 Mar 2018 04:02:14 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jia-Ju Bai , Radu Pirea , Mark Brown , Sasha Levin Subject: [PATCH 4.14 025/115] spi: atmel: fixed spin_lock usage inside atmel_spi_remove Date: Fri, 2 Mar 2018 09:50:28 +0100 Message-Id: <20180302084504.889444448@linuxfoundation.org> In-Reply-To: <20180302084503.856536800@linuxfoundation.org> References: <20180302084503.856536800@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Radu Pirea [ Upstream commit 66e900a3d225575c8b48b59ae1fe74bb6e5a65cc ] The only part of atmel_spi_remove which needs to be atomic is hardware reset. atmel_spi_stop_dma calls dma_terminate_all and this needs interrupts enabled. atmel_spi_release_dma calls dma_release_channel and dma_release_channel locks a mutex inside of spin_lock. So the call of these functions can't be inside a spin_lock. Reported-by: Jia-Ju Bai Signed-off-by: Radu Pirea Signed-off-by: Mark Brown Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi-atmel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -1661,12 +1661,12 @@ static int atmel_spi_remove(struct platf pm_runtime_get_sync(&pdev->dev); /* reset the hardware and block queue progress */ - spin_lock_irq(&as->lock); if (as->use_dma) { atmel_spi_stop_dma(master); atmel_spi_release_dma(master); } + spin_lock_irq(&as->lock); spi_writel(as, CR, SPI_BIT(SWRST)); spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */ spi_readl(as, SR);