From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kuninori Morimoto Date: Tue, 15 Sep 2015 00:11:33 +0000 Subject: Re: [PATCH] dmaengine: rcar-dmac: Wait for IRQs completion when freeing channel Message-Id: <87h9mw4kav.wl%kuninori.morimoto.gx@renesas.com> List-Id: References: <1442233573-26684-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> In-Reply-To: <1442233573-26684-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-sh@vger.kernel.org Hi Laurent > When freeing channel resources we need to ensure that no IRQ will occur > for the given channel. In order to do so the driver stops the hardware, > but an IRQ handler could still be running, especially given that the > channel IRQ is threaded. Fix it by waiting for pending IRQs completion > with synchronize_irq() > > Signed-off-by: Laurent Pinchart > --- > drivers/dma/sh/rcar-dmac.c | 37 +++++++++++++++++++------------------ > 1 file changed, 19 insertions(+), 18 deletions(-) > > Hi Morimoto-san, > > This patch is compile-tested only. Would you be able to check if it fixes the > issue you've reported with SDHI and rcar-dmac ? Thanks. I will ask to BSP team