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firmware: raspberrypi: Keep count of all consumers

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[ Upstream commit 1e7c57355a3bc617fc220234889e49fe722a6305 ]

When unbinding the firmware device we need to make sure it has no
consumers left. Otherwise we'd leave them with a firmware handle
pointing at freed memory.

Keep a reference count of all consumers and introduce rpi_firmware_put()
which will permit automatically decrease the reference count upon
unbinding consumer drivers.

Suggested-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Nicolas Saenz Julienne <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Reviewed-by: Stephen Boyd <[email protected]>
Reviewed-by: Bartosz Golaszewski <[email protected]>
Stable-dep-of: 5bca3688bdbc ("Input: raspberrypi-ts - fix refcount leak in rpi_ts_probe")
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Nicolas Saenz Julienne 2021-01-18 13:32:34 +01:00 • committed by Greg Kroah-Hartman
commit d537afa08e
2 changed files with 39 additions and 3 deletions
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2
include/soc/bcm2835/raspberrypi-firmware.h
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@ -140,6 +140,7 @@ int rpi_firmware_property(struct rpi_firmware *fw,
u32 tag, void *data, size_t len);
int rpi_firmware_property_list(struct rpi_firmware *fw,
void *data, size_t tag_size);
void rpi_firmware_put(struct rpi_firmware *fw);
struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node);
#else
static inline int rpi_firmware_property(struct rpi_firmware *fw, u32 tag,
@ -154,6 +155,7 @@ static inline int rpi_firmware_property_list(struct rpi_firmware *fw,
return -ENOSYS;
}
static inline void rpi_firmware_put(struct rpi_firmware *fw) { }
static inline struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node)
{
return NULL;