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SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-arm-kernel@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190621_055317_648452_8D39DB11 X-CRM114-Status: GOOD ( 17.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thesven73@gmail.com, shawnguo@kernel.org, s.hauer@pengutronix.de, stable@vger.kernel.org, vkoul@kernel.org, linux-imx@nxp.com, kernel@pengutronix.de, dmaengine@vger.kernel.org, dan.j.williams@intel.com, festevam@gmail.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jun 21, 2019 at 04:23:06PM +0800, yibin.gong@nxp.com wrote: > From: Robin Gong > > It is possible for an irq triggered by channel0 to be received later > after clks are disabled once firmware loaded during sdma probe. If > that happens then clearing them by writing to SDMA_H_INTR won't work > and the kernel will hang processing infinite interrupts. Actually, > don't need interrupt triggered on channel0 since it's pollling > SDMA_H_STATSTOP to know channel0 done rather than interrupt in > current code, just clear BD_INTR to disable channel0 interrupt to > avoid the above case. > This issue was brought by commit 1d069bfa3c78 ("dmaengine: imx-sdma: > ack channel 0 IRQ in the interrupt handler") which didn't take care > the above case. > > Fixes: 1d069bfa3c78 ("dmaengine: imx-sdma: ack channel 0 IRQ in the interrupt handler") > Cc: stable@vger.kernel.org #5.0+ > Signed-off-by: Robin Gong > Reported-by: Sven Van Asbroeck > Tested-by: Sven Van Asbroeck Reviewed-by: Michael Olbrich > --- > drivers/dma/imx-sdma.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c > index deea9aa..b5a1ee2 100644 > --- a/drivers/dma/imx-sdma.c > +++ b/drivers/dma/imx-sdma.c > @@ -742,7 +742,7 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size, > spin_lock_irqsave(&sdma->channel_0_lock, flags); > > bd0->mode.command = C0_SETPM; > - bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; > + bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD; > bd0->mode.count = size / 2; > bd0->buffer_addr = buf_phys; > bd0->ext_buffer_addr = address; > @@ -1064,7 +1064,7 @@ static int sdma_load_context(struct sdma_channel *sdmac) > context->gReg[7] = sdmac->watermark_level; > > bd0->mode.command = C0_SETDM; > - bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; > + bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD; > bd0->mode.count = sizeof(*context) / 4; > bd0->buffer_addr = sdma->context_phys; > bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel; > -- > 2.7.4 > > -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel