Using devm_spi_register_master leads to a memory leak on the spi_master
structure.
spi_alloc_master uses kzalloc to allocate the spi_master but the introduction
of devm_spi_register_master removed all the matching calls to spi_master_put,
leaking the spi_master structure.
Add a devm_spi_alloc_master to provide the intended behaviour.
Signed-off-by: Maxime Ripard <maxime.rip...@free-electrons.com>
---
drivers/spi/spi.c | 36 ++++++++++++++++++++++++++++++++++++
include/linux/spi/spi.h | 2 ++
2 files changed, 38 insertions(+)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 63613a9..eb728ec 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1266,6 +1266,42 @@ struct spi_master *spi_alloc_master(struct device *dev,
unsigned size)
}
EXPORT_SYMBOL_GPL(spi_alloc_master);
+static void devm_spi_put(struct device *dev, void *res)
+{
+ spi_master_put(*(struct spi_master **)res);
+}
+
+/**
+ * devm_spi_alloc_master - allocate SPI master controller
+ * @dev: the controller, possibly using the platform_bus
+ * @size: how much zeroed driver-private data to allocate; the pointer to this
+ * memory is in the driver_data field of the returned device,
+ * accessible with spi_master_get_devdata().
+ * Context: can sleep
+ *
+ * Allocates a master controller as with spi_alloc_master() which will
+ * automatically be freed
+ */
+struct spi_master *devm_spi_alloc_master(struct device *dev, unsigned size)
+{
+ struct spi_master **ptr, *master;
+
+ ptr = devres_alloc(devm_spi_put, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return NULL;
+
+ master = spi_alloc_master(dev, size);
+ if (master) {
+ *ptr = master;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return master;
+}
+EXPORT_SYMBOL_GPL(devm_spi_alloc_master);
+
#ifdef CONFIG_OF
static int of_spi_register_master(struct spi_master *master)
{
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index a1d4ca2..6fbdb2b 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -462,6 +462,8 @@ extern void spi_finalize_current_transfer(struct spi_master
*master);
/* the spi driver core manages memory for the spi_master classdev */
extern struct spi_master *
spi_alloc_master(struct device *host, unsigned size);
+extern struct spi_master *
+devm_spi_alloc_master(struct device *host, unsigned size);
extern int spi_register_master(struct spi_master *master);
extern int devm_spi_register_master(struct device *dev,
--
1.8.4.2
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