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Revert "i3c: master: Fix dynamic address leak when 'assigned-address' is present"

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This reverts commit 8c77c55f45 which is
commit 851bd21cdb55e727ab29280bc9f6b678164f802a upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I1b3dbe3ece19354d604b386d3d99f5456f290d0b
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman
2024-12-30 10:39:13 +00:00
parent 059dc61b44
commit 77e519c5be
1 changed files with 10 additions and 5 deletions
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15
drivers/i3c/master.c
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@@ -1491,9 +1491,16 @@ static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
u8 old_dyn_addr)
{
struct i3c_master_controller *master = i3c_dev_get_master(dev);
enum i3c_addr_slot_status status;
int ret;
if (dev->info.dyn_addr != old_dyn_addr) {
if (dev->info.dyn_addr != old_dyn_addr &&
(!dev->boardinfo ||
dev->info.dyn_addr != dev->boardinfo->init_dyn_addr)) {
status = i3c_bus_get_addr_slot_status(&master->bus,
dev->info.dyn_addr);
if (status != I3C_ADDR_SLOT_FREE)
return -EBUSY;
i3c_bus_set_addr_slot_status(&master->bus,
dev->info.dyn_addr,
I3C_ADDR_SLOT_I3C_DEV);
@@ -1895,10 +1902,9 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
goto err_rstdaa;
}
/* Do not mark as occupied until real device exist in bus */
i3c_bus_set_addr_slot_status_mask(&master->bus,
i3cboardinfo->init_dyn_addr,
I3C_ADDR_SLOT_EXT_DESIRED,
I3C_ADDR_SLOT_I3C_DEV | I3C_ADDR_SLOT_EXT_DESIRED,
I3C_ADDR_SLOT_EXT_STATUS_MASK);
/*
@@ -2062,8 +2068,7 @@ int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master,
else
expected_dyn_addr = newdev->info.dyn_addr;
if (newdev->info.dyn_addr != expected_dyn_addr &&
i3c_bus_get_addr_slot_status(&master->bus, expected_dyn_addr) == I3C_ADDR_SLOT_FREE) {
if (newdev->info.dyn_addr != expected_dyn_addr) {
/*
* Try to apply the expected dynamic address. If it fails, keep
* the address assigned by the master.