Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50228 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423387AbeCBIxx (ORCPT ); Fri, 2 Mar 2018 03:53:53 -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 3.18 06/24] spi: atmel: fixed spin_lock usage inside atmel_spi_remove Date: Fri, 2 Mar 2018 09:51:03 +0100 Message-Id: <20180302084239.490259197@linuxfoundation.org> In-Reply-To: <20180302084239.157503766@linuxfoundation.org> References: <20180302084239.157503766@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 3.18-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 @@ -1416,12 +1416,12 @@ static int atmel_spi_remove(struct platf struct atmel_spi *as = spi_master_get_devdata(master); /* reset the hardware and block queue progress */ - spin_lock_irq(&as->lock); if (as->use_dma) { atmel_spi_stop_dma(as); atmel_spi_release_dma(as); } + 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);