linux-kernel - [PATCH 1/3] dmaengine: xilinx_dma: use readl_poll_timeout

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Message-ID: <1604473206-32573-2-git-send-email-radhey.shyam.pandey@xilinx.com>
Date:   Wed, 4 Nov 2020 12:30:04 +0530
From:   Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
To:     <vkoul@...nel.org>, <dan.j.williams@...el.com>,
        <michal.simek@...inx.com>, <nick.graumann@...il.com>,
        <andrea.merello@...il.com>, <appana.durga.rao@...inx.com>,
        <mcgrof@...nel.org>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <git@...inx.com>, Marc Ferland <ferlandm@...tus.ca>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Subject: [PATCH 1/3] dmaengine: xilinx_dma: use readl_poll_timeout_atomic variant

From: Marc Ferland <ferlandm@...tus.ca>

The xilinx_dma_poll_timeout macro is sometimes called while holding a
spinlock (see xilinx_dma_issue_pending() for an example) this means we
shouldn't sleep when polling the dma channel registers. To address it
in xilinx poll timeout macro use readl_poll_timeout_atomic instead of
readl_poll_timeout variant.

Signed-off-by: Marc Ferland <ferlandm@...tus.ca>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
---
 drivers/dma/xilinx/xilinx_dma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 5429497d3560..9c747b08bb0f 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -517,8 +517,8 @@ struct xilinx_dma_device {
 #define to_dma_tx_descriptor(tx) \
 	container_of(tx, struct xilinx_dma_tx_descriptor, async_tx)
 #define xilinx_dma_poll_timeout(chan, reg, val, cond, delay_us, timeout_us) \
-	readl_poll_timeout(chan->xdev->regs + chan->ctrl_offset + reg, val, \
-			   cond, delay_us, timeout_us)
+	readl_poll_timeout_atomic(chan->xdev->regs + chan->ctrl_offset + reg, \
+				  val, cond, delay_us, timeout_us)
 
 /* IO accessors */
 static inline u32 dma_read(struct xilinx_dma_chan *chan, u32 reg)
-- 
2.7.4