6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stefan Wahren <wahrenst@xxxxxxx>
[ Upstream commit 2d7198278ece01818cd95a3beffbdf8b2a353fa0 ]
The whole mechanism to remember occurred SPI interrupts is not atomic,
which could lead to unexpected behavior. So fix this by using atomic bit
operations instead.
Fixes: 291ab06ecf67 ("net: qualcomm: new Ethernet over SPI driver for QCA7000")
Signed-off-by: Stefan Wahren <wahrenst@xxxxxxx>
Link: https://lore.kernel.org/r/20240614145030.7781-1-wahrenst@xxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/qualcomm/qca_debug.c | 6 ++----
drivers/net/ethernet/qualcomm/qca_spi.c | 16 ++++++++--------
drivers/net/ethernet/qualcomm/qca_spi.h | 3 +--
3 files changed, 11 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/qca_debug.c b/drivers/net/ethernet/qualcomm/qca_debug.c
index 1822f2ad8f0dd..2ac1b1b96e6a4 100644
--- a/drivers/net/ethernet/qualcomm/qca_debug.c
+++ b/drivers/net/ethernet/qualcomm/qca_debug.c
@@ -111,10 +111,8 @@ qcaspi_info_show(struct seq_file *s, void *what)
seq_printf(s, "IRQ : %d\n",
qca->spi_dev->irq);
- seq_printf(s, "INTR REQ : %u\n",
- qca->intr_req);
- seq_printf(s, "INTR SVC : %u\n",
- qca->intr_svc);
+ seq_printf(s, "INTR : %lx\n",
+ qca->intr);
seq_printf(s, "SPI max speed : %lu\n",
(unsigned long)qca->spi_dev->max_speed_hz);
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 5f3c11fb3fa27..b697a9e6face6 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -48,6 +48,8 @@
#define MAX_DMA_BURST_LEN 5000
+#define SPI_INTR 0
+
/* Modules parameters */
#define QCASPI_CLK_SPEED_MIN 1000000
#define QCASPI_CLK_SPEED_MAX 16000000
@@ -592,14 +594,14 @@ qcaspi_spi_thread(void *data)
continue;
}
- if ((qca->intr_req == qca->intr_svc) &&
+ if (!test_bit(SPI_INTR, &qca->intr) &&
!qca->txr.skb[qca->txr.head])
schedule();
set_current_state(TASK_RUNNING);
- netdev_dbg(qca->net_dev, "have work to do. int: %d, tx_skb: %p\n",
- qca->intr_req - qca->intr_svc,
+ netdev_dbg(qca->net_dev, "have work to do. int: %lu, tx_skb: %p\n",
+ qca->intr,
qca->txr.skb[qca->txr.head]);
qcaspi_qca7k_sync(qca, QCASPI_EVENT_UPDATE);
@@ -613,8 +615,7 @@ qcaspi_spi_thread(void *data)
msleep(QCASPI_QCA7K_REBOOT_TIME_MS);
}
- if (qca->intr_svc != qca->intr_req) {
- qca->intr_svc = qca->intr_req;
+ if (test_and_clear_bit(SPI_INTR, &qca->intr)) {
start_spi_intr_handling(qca, &intr_cause);
if (intr_cause & SPI_INT_CPU_ON) {
@@ -676,7 +677,7 @@ qcaspi_intr_handler(int irq, void *data)
{
struct qcaspi *qca = data;
- qca->intr_req++;
+ set_bit(SPI_INTR, &qca->intr);
if (qca->spi_thread)
wake_up_process(qca->spi_thread);
@@ -692,8 +693,7 @@ qcaspi_netdev_open(struct net_device *dev)
if (!qca)
return -EINVAL;
- qca->intr_req = 1;
- qca->intr_svc = 0;
+ set_bit(SPI_INTR, &qca->intr);
qca->sync = QCASPI_SYNC_UNKNOWN;
qcafrm_fsm_init_spi(&qca->frm_handle);
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.h b/drivers/net/ethernet/qualcomm/qca_spi.h
index 3067356106f0b..58ad910068d4b 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.h
+++ b/drivers/net/ethernet/qualcomm/qca_spi.h
@@ -93,8 +93,7 @@ struct qcaspi {
struct qcafrm_handle frm_handle;
struct sk_buff *rx_skb;
- unsigned int intr_req;
- unsigned int intr_svc;
+ unsigned long intr;
u16 reset_count;
#ifdef CONFIG_DEBUG_FS
--
2.43.0
