Merge tag 'spi-fix-v6.7-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi fixes from Mark Brown:
"A couple of fixes that came in during the merge window: one Kconfig
dependency fix and another fix for a long standing issue where a sync
transfer races with system suspend"
* tag 'spi-fix-v6.7-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: Fix null dereference on suspend
spi: spi-zynq-qspi: add spi-mem to driver kconfig dependencies
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 35dbfac..70c9dd6 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -1169,6 +1169,7 @@
config SPI_ZYNQ_QSPI
tristate "Xilinx Zynq QSPI controller"
depends on ARCH_ZYNQ || COMPILE_TEST
+ depends on SPI_MEM
help
This enables support for the Zynq Quad SPI controller
in master mode.
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 791df0e..8ead7ac 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3317,33 +3317,52 @@ void spi_unregister_controller(struct spi_controller *ctlr)
}
EXPORT_SYMBOL_GPL(spi_unregister_controller);
+static inline int __spi_check_suspended(const struct spi_controller *ctlr)
+{
+ return ctlr->flags & SPI_CONTROLLER_SUSPENDED ? -ESHUTDOWN : 0;
+}
+
+static inline void __spi_mark_suspended(struct spi_controller *ctlr)
+{
+ mutex_lock(&ctlr->bus_lock_mutex);
+ ctlr->flags |= SPI_CONTROLLER_SUSPENDED;
+ mutex_unlock(&ctlr->bus_lock_mutex);
+}
+
+static inline void __spi_mark_resumed(struct spi_controller *ctlr)
+{
+ mutex_lock(&ctlr->bus_lock_mutex);
+ ctlr->flags &= ~SPI_CONTROLLER_SUSPENDED;
+ mutex_unlock(&ctlr->bus_lock_mutex);
+}
+
int spi_controller_suspend(struct spi_controller *ctlr)
{
- int ret;
+ int ret = 0;
/* Basically no-ops for non-queued controllers */
- if (!ctlr->queued)
- return 0;
+ if (ctlr->queued) {
+ ret = spi_stop_queue(ctlr);
+ if (ret)
+ dev_err(&ctlr->dev, "queue stop failed\n");
+ }
- ret = spi_stop_queue(ctlr);
- if (ret)
- dev_err(&ctlr->dev, "queue stop failed\n");
-
+ __spi_mark_suspended(ctlr);
return ret;
}
EXPORT_SYMBOL_GPL(spi_controller_suspend);
int spi_controller_resume(struct spi_controller *ctlr)
{
- int ret;
+ int ret = 0;
- if (!ctlr->queued)
- return 0;
+ __spi_mark_resumed(ctlr);
- ret = spi_start_queue(ctlr);
- if (ret)
- dev_err(&ctlr->dev, "queue restart failed\n");
-
+ if (ctlr->queued) {
+ ret = spi_start_queue(ctlr);
+ if (ret)
+ dev_err(&ctlr->dev, "queue restart failed\n");
+ }
return ret;
}
EXPORT_SYMBOL_GPL(spi_controller_resume);
@@ -4147,8 +4166,7 @@ static void __spi_transfer_message_noqueue(struct spi_controller *ctlr, struct s
ctlr->cur_msg = msg;
ret = __spi_pump_transfer_message(ctlr, msg, was_busy);
if (ret)
- goto out;
-
+ dev_err(&ctlr->dev, "noqueue transfer failed\n");
ctlr->cur_msg = NULL;
ctlr->fallback = false;
@@ -4164,7 +4182,6 @@ static void __spi_transfer_message_noqueue(struct spi_controller *ctlr, struct s
spi_idle_runtime_pm(ctlr);
}
-out:
mutex_unlock(&ctlr->io_mutex);
}
@@ -4187,6 +4204,11 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message)
int status;
struct spi_controller *ctlr = spi->controller;
+ if (__spi_check_suspended(ctlr)) {
+ dev_warn_once(&spi->dev, "Attempted to sync while suspend\n");
+ return -ESHUTDOWN;
+ }
+
status = __spi_validate(spi, message);
if (status != 0)
return status;
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 86825c8..255a056 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -566,6 +566,7 @@ struct spi_controller {
#define SPI_CONTROLLER_MUST_RX BIT(3) /* Requires rx */
#define SPI_CONTROLLER_MUST_TX BIT(4) /* Requires tx */
#define SPI_CONTROLLER_GPIO_SS BIT(5) /* GPIO CS must select slave */
+#define SPI_CONTROLLER_SUSPENDED BIT(6) /* Currently suspended */
/* Flag indicating if the allocation of this struct is devres-managed */
bool devm_allocated;
