netdev - [PATCH net v3] net: lan743x: Don't sleep in atomic context

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Date: Tue, 27 Jun 2023 03:50:00 +0000
From: Moritz Fischer <moritzf@...gle.com>
To: netdev@...r.kernel.org
Cc: pabeni@...hat.com, kuba@...nel.org, edumazet@...gle.com, 
	davem@...emloft.net, bryan.whitehead@...rochip.com, 
	UNGLinuxDriver@...rochip.com, mdf@...nel.org, 
	Moritz Fischer <moritzf@...gle.com>, stable@...r.kernel.org
Subject: [PATCH net v3] net: lan743x: Don't sleep in atomic context

dev_set_rx_mode() grabs a spin_lock, and the lan743x implementation
proceeds subsequently to go to sleep using readx_poll_timeout().

Introduce a helper wrapping the readx_poll_timeout_atomic() function
and use it to replace the calls to readx_polL_timeout().

Fixes: 23f0703c125b ("lan743x: Add main source files for new lan743x driver")
Cc: stable@...r.kernel.org
Cc: Bryan Whitehead <bryan.whitehead@...rochip.com>
Cc: UNGLinuxDriver@...rochip.com
Signed-off-by: Moritz Fischer <moritzf@...gle.com>
---

Changes from v2:
- Incorporate suggestion from Jakub

Changes from v1:
- Added line-breaks
- Changed subject to target net-next
- Removed Tested-by: tag

---
 drivers/net/ethernet/microchip/lan743x_main.c | 21 +++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
index f1bded993edc..61eadc0bca8b 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -144,6 +144,18 @@ static int lan743x_csr_light_reset(struct lan743x_adapter *adapter)
 				  !(data & HW_CFG_LRST_), 100000, 10000000);
 }
 
+static int lan743x_csr_wait_for_bit_atomic(struct lan743x_adapter *adapter,
+					   int offset, u32 bit_mask,
+					   int target_value, int udelay_min,
+					   int udelay_max, int count)
+{
+	u32 data;
+
+	return readx_poll_timeout_atomic(LAN743X_CSR_READ_OP, offset, data,
+					 target_value == !!(data & bit_mask),
+					 udelay_max, udelay_min * count);
+}
+
 static int lan743x_csr_wait_for_bit(struct lan743x_adapter *adapter,
 				    int offset, u32 bit_mask,
 				    int target_value, int usleep_min,
@@ -736,8 +748,8 @@ static int lan743x_dp_write(struct lan743x_adapter *adapter,
 	u32 dp_sel;
 	int i;
 
-	if (lan743x_csr_wait_for_bit(adapter, DP_SEL, DP_SEL_DPRDY_,
-				     1, 40, 100, 100))
+	if (lan743x_csr_wait_for_bit_atomic(adapter, DP_SEL, DP_SEL_DPRDY_,
+					    1, 40, 100, 100))
 		return -EIO;
 	dp_sel = lan743x_csr_read(adapter, DP_SEL);
 	dp_sel &= ~DP_SEL_MASK_;
@@ -748,8 +760,9 @@ static int lan743x_dp_write(struct lan743x_adapter *adapter,
 		lan743x_csr_write(adapter, DP_ADDR, addr + i);
 		lan743x_csr_write(adapter, DP_DATA_0, buf[i]);
 		lan743x_csr_write(adapter, DP_CMD, DP_CMD_WRITE_);
-		if (lan743x_csr_wait_for_bit(adapter, DP_SEL, DP_SEL_DPRDY_,
-					     1, 40, 100, 100))
+		if (lan743x_csr_wait_for_bit_atomic(adapter, DP_SEL,
+						    DP_SEL_DPRDY_,
+						    1, 40, 100, 100))
 			return -EIO;
 	}
 
-- 
2.41.0.178.g377b9f9a00-goog