We currently have only devm_ macro fakery that leaks resources on device
removal. This is flagged by static analysis and requires modifications
to ported kernel code that uses devres-managed actions.
Implement destructor support into talloc and use it implement a subset
of the Linux devm functionality.
How devm_ allocated device resources are freed is a bit different from
Linux:
- Runtime unbounding of a device driver or removal of a device
frees _all_ device resources
- Boot time invocation of the remove callback is followed by running
_only_ the destructors. Allocations are leaked as the kernel will
reclaim all memory anyway.
Ahmad Fatoum (19):
commands: devunbind: refuse to unbind devices that were never bound
commands: devunbind: don't poison the active list entry
talloc: remove unused talloc_steal() and talloc_steal_children()
talloc: free children in a loop
talloc: add support for destructors
test: self: talloc: add destructor tests
talloc: add talloc_run_destructors()
mfd: pca9450: don't free device-managed memory in probe error path
video: backlight-pwm: allocate brightness levels with devm_kcalloc
driver: implement devm_ allocation helpers on top of talloc
devres: Provide kmalloc_obj*-style API for devm_kmalloc
memory: atmel-ebi: use generic devm_kzalloc()
driver: add devm_add_action()
test: self: add devm_ selftest
driver: add devm_request_mem_resource()
driver: make dev_platform_ioremap_resource() device-managed
treewide: rename dev_platform_ioremap_resource() to
devm_platform_ioremap_resource()
driver: make dev_platform_get_and_ioremap_resource() device-managed
serial: stm32: request the registers with devm_request_mem_resource()
commands/devunbind.c | 11 +-
drivers/base/Makefile | 1 +
drivers/base/devres.c | 259 ++++++++++++++
drivers/base/driver.c | 61 ++--
drivers/hw_random/atmel-rng.c | 2 +-
drivers/hw_random/bcm2835-rng.c | 2 +-
drivers/hw_random/iproc-rng200.c | 2 +-
drivers/hw_random/omap-rng.c | 2 +-
drivers/hw_random/timeriomem-rng.c | 2 +-
drivers/memory/atmel-ebi.c | 6 +-
drivers/mfd/atmel-flexcom.c | 2 +-
drivers/mfd/pca9450.c | 20 +-
.../phy/rockchip/phy-rockchip-inno-dsidphy.c | 2 +-
drivers/phy/rockchip/phy-rockchip-usbdp.c | 2 +-
drivers/pmdomain/imx/imx8mp-blk-ctrl.c | 2 +-
drivers/pmdomain/imx/imx93-blk-ctrl.c | 2 +-
drivers/pmdomain/imx/imx93-pd.c | 2 +-
drivers/pwm/pwm-imx-tpm.c | 2 +-
drivers/pwm/pwm-rockchip.c | 2 +-
drivers/serial/serial_stm32.c | 6 +-
drivers/spi/spi-fsl-qspi.c | 2 +-
drivers/usb/dwc3/dwc3-imx8mp.c | 2 +-
drivers/video/backlight-pwm.c | 6 +-
drivers/video/rockchip/dw-mipi-dsi-rockchip.c | 2 +-
include/device.h | 3 +
include/driver.h | 27 +-
include/linux/device.h | 152 ++++++--
include/talloc.h | 5 +-
lib/talloc.c | 205 ++++++-----
test/self/Kconfig | 6 +
test/self/Makefile | 1 +
test/self/devres.c | 327 ++++++++++++++++++
test/self/talloc.c | 207 +++++++++++
33 files changed, 1148 insertions(+), 187 deletions(-)
create mode 100644 drivers/base/devres.c
create mode 100644 test/self/devres.c
--
2.47.3
