linux-kernel - [PATCH V4 2/8] i3c: master: svc: fix atomic issue

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Message-Id: <20210809063645.2289988-3-xiaoning.wang@nxp.com>
Date:   Mon,  9 Aug 2021 14:36:39 +0800
From:   Clark Wang <xiaoning.wang@....com>
To:     miquel.raynal@...tlin.com, conor.culhane@...vaco.com,
        alexandre.belloni@...tlin.com
Cc:     linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-imx@....com
Subject: [PATCH V4 2/8] i3c: master: svc: fix atomic issue

do_daa_locked() function is in a spin lock environment, use
readl_poll_timeout_atomic() to replace the origin
readl_poll_timeout().

Signed-off-by: Clark Wang <xiaoning.wang@....com>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
Reviewed-by: Jun Li <jun.li@....com>
---
V3/V4: No change.
V2: align the parameters of the function.
---
 drivers/i3c/master/svc-i3c-master.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index c25a372f6820..47c02a60cf62 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -656,8 +656,10 @@ static int svc_i3c_master_readb(struct svc_i3c_master *master, u8 *dst,
 	u32 reg;
 
 	for (i = 0; i < len; i++) {
-		ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
-					 SVC_I3C_MSTATUS_RXPEND(reg), 0, 1000);
+		ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS,
+						reg,
+						SVC_I3C_MSTATUS_RXPEND(reg),
+						0, 1000);
 		if (ret)
 			return ret;
 
@@ -687,10 +689,11 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
 		 * Either one slave will send its ID, or the assignment process
 		 * is done.
 		 */
-		ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
-					 SVC_I3C_MSTATUS_RXPEND(reg) |
-					 SVC_I3C_MSTATUS_MCTRLDONE(reg),
-					 1, 1000);
+		ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS,
+						reg,
+						SVC_I3C_MSTATUS_RXPEND(reg) |
+						SVC_I3C_MSTATUS_MCTRLDONE(reg),
+						1, 1000);
 		if (ret)
 			return ret;
 
@@ -744,11 +747,12 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
 		}
 
 		/* Wait for the slave to be ready to receive its address */
-		ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
-					 SVC_I3C_MSTATUS_MCTRLDONE(reg) &&
-					 SVC_I3C_MSTATUS_STATE_DAA(reg) &&
-					 SVC_I3C_MSTATUS_BETWEEN(reg),
-					 0, 1000);
+		ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS,
+						reg,
+						SVC_I3C_MSTATUS_MCTRLDONE(reg) &&
+						SVC_I3C_MSTATUS_STATE_DAA(reg) &&
+						SVC_I3C_MSTATUS_BETWEEN(reg),
+						0, 1000);
 		if (ret)
 			return ret;
 
-- 
2.25.1