Merge series "spi: Various Cleanups" from Uwe Kleine-König <u.kleine-koenig@pengutronix.de>:

Hello,

while trying to understand how the spi framework makes use of the core
device driver stuff (to fix a deadlock) I found these simplifications
and improvements.

They are build-tested with allmodconfig on arm64, m68k, powerpc, riscv,
s390, sparc64 and x86_64.

Best regards
Uwe

Uwe Kleine-König (4):
  spi: Move comment about chipselect check to the right place
  spi: Remove unused function spi_busnum_to_master()
  spi: Reorder functions to simplify the next commit
  spi: Make several public functions private to spi.c

 Documentation/spi/spi-summary.rst |   8 -
 drivers/spi/spi.c                 | 237 ++++++++++++------------------
 include/linux/spi/spi.h           |  55 -------
 3 files changed, 95 insertions(+), 205 deletions(-)

base-commit: 9e1ff307c779ce1f0f810c7ecce3d95bbae40896
--
2.30.2

1 files changed, 95 insertions, 142 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index aea037c65985..50591de16e0f 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -285,9 +285,9 @@ static const struct attribute_group *spi_master_groups[] = {
 	NULL,
 };
 
-void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
-				       struct spi_transfer *xfer,
-				       struct spi_controller *ctlr)
+static void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
+					      struct spi_transfer *xfer,
+					      struct spi_controller *ctlr)
 {
 	unsigned long flags;
 	int l2len = min(fls(xfer->len), SPI_STATISTICS_HISTO_SIZE) - 1;
@@ -310,7 +310,6 @@ void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
 
 	spin_unlock_irqrestore(&stats->lock, flags);
 }
-EXPORT_SYMBOL_GPL(spi_statistics_add_transfer_stats);
 
 /* modalias support makes "modprobe $MODALIAS" new-style hotplug work,
  * and the sysfs version makes coldplug work too.
@@ -501,7 +500,7 @@ static DEFINE_MUTEX(spi_add_lock);
  *
  * Return: a pointer to the new device, or NULL.
  */
-struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
+static struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
 {
 	struct spi_device	*spi;
 
@@ -526,7 +525,6 @@ struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
 	device_initialize(&spi->dev);
 	return spi;
 }
-EXPORT_SYMBOL_GPL(spi_alloc_device);
 
 static void spi_dev_set_name(struct spi_device *spi)
 {
@@ -564,6 +562,11 @@ static int __spi_add_device(struct spi_device *spi)
 	struct device *dev = ctlr->dev.parent;
 	int status;
 
+	/*
+	 * We need to make sure there's no other device with this
+	 * chipselect **BEFORE** we call setup(), else we'll trash
+	 * its configuration.
+	 */
 	status = bus_for_each_dev(&spi_bus_type, NULL, spi, spi_dev_check);
 	if (status) {
 		dev_err(dev, "chipselect %d already in use\n",
@@ -616,7 +619,7 @@ static int __spi_add_device(struct spi_device *spi)
  *
  * Return: 0 on success; negative errno on failure
  */
-int spi_add_device(struct spi_device *spi)
+static int spi_add_device(struct spi_device *spi)
 {
 	struct spi_controller *ctlr = spi->controller;
 	struct device *dev = ctlr->dev.parent;
@@ -632,16 +635,11 @@ int spi_add_device(struct spi_device *spi)
 	/* Set the bus ID string */
 	spi_dev_set_name(spi);
 
-	/* We need to make sure there's no other device with this
-	 * chipselect **BEFORE** we call setup(), else we'll trash
-	 * its configuration.  Lock against concurrent add() calls.
-	 */
 	mutex_lock(&spi_add_lock);
 	status = __spi_add_device(spi);
 	mutex_unlock(&spi_add_lock);
 	return status;
 }
-EXPORT_SYMBOL_GPL(spi_add_device);
 
 static int spi_add_device_locked(struct spi_device *spi)
 {
@@ -816,6 +814,87 @@ int spi_register_board_info(struct spi_board_info const *info, unsigned n)
 
 /*-------------------------------------------------------------------------*/
 
+/* Core methods for SPI resource management */
+
+/**
+ * spi_res_alloc - allocate a spi resource that is life-cycle managed
+ *                 during the processing of a spi_message while using
+ *                 spi_transfer_one
+ * @spi:     the spi device for which we allocate memory
+ * @release: the release code to execute for this resource
+ * @size:    size to alloc and return
+ * @gfp:     GFP allocation flags
+ *
+ * Return: the pointer to the allocated data
+ *
+ * This may get enhanced in the future to allocate from a memory pool
+ * of the @spi_device or @spi_controller to avoid repeated allocations.
+ */
+static void *spi_res_alloc(struct spi_device *spi, spi_res_release_t release,
+			   size_t size, gfp_t gfp)
+{
+	struct spi_res *sres;
+
+	sres = kzalloc(sizeof(*sres) + size, gfp);
+	if (!sres)
+		return NULL;
+
+	INIT_LIST_HEAD(&sres->entry);
+	sres->release = release;
+
+	return sres->data;
+}
+
+/**
+ * spi_res_free - free an spi resource
+ * @res: pointer to the custom data of a resource
+ *
+ */
+static void spi_res_free(void *res)
+{
+	struct spi_res *sres = container_of(res, struct spi_res, data);
+
+	if (!res)
+		return;
+
+	WARN_ON(!list_empty(&sres->entry));
+	kfree(sres);
+}
+
+/**
+ * spi_res_add - add a spi_res to the spi_message
+ * @message: the spi message
+ * @res:     the spi_resource
+ */
+static void spi_res_add(struct spi_message *message, void *res)
+{
+	struct spi_res *sres = container_of(res, struct spi_res, data);
+
+	WARN_ON(!list_empty(&sres->entry));
+	list_add_tail(&sres->entry, &message->resources);
+}
+
+/**
+ * spi_res_release - release all spi resources for this message
+ * @ctlr:  the @spi_controller
+ * @message: the @spi_message
+ */
+static void spi_res_release(struct spi_controller *ctlr, struct spi_message *message)
+{
+	struct spi_res *res, *tmp;
+
+	list_for_each_entry_safe_reverse(res, tmp, &message->resources, entry) {
+		if (res->release)
+			res->release(ctlr, message, res->data);
+
+		list_del(&res->entry);
+
+		kfree(res);
+	}
+}
+
+/*-------------------------------------------------------------------------*/
+
 static void spi_set_cs(struct spi_device *spi, bool enable, bool force)
 {
 	bool activate = enable;
@@ -3032,127 +3111,6 @@ int spi_controller_resume(struct spi_controller *ctlr)
 }
 EXPORT_SYMBOL_GPL(spi_controller_resume);
 
-static int __spi_controller_match(struct device *dev, const void *data)
-{
-	struct spi_controller *ctlr;
-	const u16 *bus_num = data;
-
-	ctlr = container_of(dev, struct spi_controller, dev);
-	return ctlr->bus_num == *bus_num;
-}
-
-/**
- * spi_busnum_to_master - look up master associated with bus_num
- * @bus_num: the master's bus number
- * Context: can sleep
- *
- * This call may be used with devices that are registered after
- * arch init time.  It returns a refcounted pointer to the relevant
- * spi_controller (which the caller must release), or NULL if there is
- * no such master registered.
- *
- * Return: the SPI master structure on success, else NULL.
- */
-struct spi_controller *spi_busnum_to_master(u16 bus_num)
-{
-	struct device		*dev;
-	struct spi_controller	*ctlr = NULL;
-
-	dev = class_find_device(&spi_master_class, NULL, &bus_num,
-				__spi_controller_match);
-	if (dev)
-		ctlr = container_of(dev, struct spi_controller, dev);
-	/* reference got in class_find_device */
-	return ctlr;
-}
-EXPORT_SYMBOL_GPL(spi_busnum_to_master);
-
-/*-------------------------------------------------------------------------*/
-
-/* Core methods for SPI resource management */
-
-/**
- * spi_res_alloc - allocate a spi resource that is life-cycle managed
- *                 during the processing of a spi_message while using
- *                 spi_transfer_one
- * @spi:     the spi device for which we allocate memory
- * @release: the release code to execute for this resource
- * @size:    size to alloc and return
- * @gfp:     GFP allocation flags
- *
- * Return: the pointer to the allocated data
- *
- * This may get enhanced in the future to allocate from a memory pool
- * of the @spi_device or @spi_controller to avoid repeated allocations.
- */
-void *spi_res_alloc(struct spi_device *spi,
-		    spi_res_release_t release,
-		    size_t size, gfp_t gfp)
-{
-	struct spi_res *sres;
-
-	sres = kzalloc(sizeof(*sres) + size, gfp);
-	if (!sres)
-		return NULL;
-
-	INIT_LIST_HEAD(&sres->entry);
-	sres->release = release;
-
-	return sres->data;
-}
-EXPORT_SYMBOL_GPL(spi_res_alloc);
-
-/**
- * spi_res_free - free an spi resource
- * @res: pointer to the custom data of a resource
- *
- */
-void spi_res_free(void *res)
-{
-	struct spi_res *sres = container_of(res, struct spi_res, data);
-
-	if (!res)
-		return;
-
-	WARN_ON(!list_empty(&sres->entry));
-	kfree(sres);
-}
-EXPORT_SYMBOL_GPL(spi_res_free);
-
-/**
- * spi_res_add - add a spi_res to the spi_message
- * @message: the spi message
- * @res:     the spi_resource
- */
-void spi_res_add(struct spi_message *message, void *res)
-{
-	struct spi_res *sres = container_of(res, struct spi_res, data);
-
-	WARN_ON(!list_empty(&sres->entry));
-	list_add_tail(&sres->entry, &message->resources);
-}
-EXPORT_SYMBOL_GPL(spi_res_add);
-
-/**
- * spi_res_release - release all spi resources for this message
- * @ctlr:  the @spi_controller
- * @message: the @spi_message
- */
-void spi_res_release(struct spi_controller *ctlr, struct spi_message *message)
-{
-	struct spi_res *res, *tmp;
-
-	list_for_each_entry_safe_reverse(res, tmp, &message->resources, entry) {
-		if (res->release)
-			res->release(ctlr, message, res->data);
-
-		list_del(&res->entry);
-
-		kfree(res);
-	}
-}
-EXPORT_SYMBOL_GPL(spi_res_release);
-
 /*-------------------------------------------------------------------------*/
 
 /* Core methods for spi_message alterations */
@@ -3191,7 +3149,7 @@ static void __spi_replace_transfers_release(struct spi_controller *ctlr,
  * Returns: pointer to @spi_replaced_transfers,
  *          PTR_ERR(...) in case of errors.
  */
-struct spi_replaced_transfers *spi_replace_transfers(
+static struct spi_replaced_transfers *spi_replace_transfers(
 	struct spi_message *msg,
 	struct spi_transfer *xfer_first,
 	size_t remove,
@@ -3283,7 +3241,6 @@ struct spi_replaced_transfers *spi_replace_transfers(
 
 	return rxfer;
 }
-EXPORT_SYMBOL_GPL(spi_replace_transfers);
 
 static int __spi_split_transfer_maxsize(struct spi_controller *ctlr,
 					struct spi_message *msg,
@@ -3833,7 +3790,7 @@ EXPORT_SYMBOL_GPL(spi_async);
  *
  * Return: zero on success, else a negative error code.
  */
-int spi_async_locked(struct spi_device *spi, struct spi_message *message)
+static int spi_async_locked(struct spi_device *spi, struct spi_message *message)
 {
 	struct spi_controller *ctlr = spi->controller;
 	int ret;
@@ -3852,7 +3809,6 @@ int spi_async_locked(struct spi_device *spi, struct spi_message *message)
 	return ret;
 
 }
-EXPORT_SYMBOL_GPL(spi_async_locked);
 
 /*-------------------------------------------------------------------------*/
 
@@ -4110,18 +4066,15 @@ EXPORT_SYMBOL_GPL(spi_write_then_read);
 
 /*-------------------------------------------------------------------------*/
 
-#if IS_ENABLED(CONFIG_OF)
+#if IS_ENABLED(CONFIG_OF_DYNAMIC)
 /* must call put_device() when done with returned spi_device device */
-struct spi_device *of_find_spi_device_by_node(struct device_node *node)
+static struct spi_device *of_find_spi_device_by_node(struct device_node *node)
 {
 	struct device *dev = bus_find_device_by_of_node(&spi_bus_type, node);
 
 	return dev ? to_spi_device(dev) : NULL;
 }
-EXPORT_SYMBOL_GPL(of_find_spi_device_by_node);
-#endif /* IS_ENABLED(CONFIG_OF) */
 
-#if IS_ENABLED(CONFIG_OF_DYNAMIC)
 /* the spi controllers are not using spi_bus, so we find it with another way */
 static struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)
 {