6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Frank Li Frank.Li@nxp.com
commit 36faa04ce3d9c962b4b29d285ad07ca29e2988e4 upstream.
When a new device hotjoins, a new dynamic address is assigned. i3c_master_add_i3c_dev_locked() identifies that the device was previously attached to the bus and locates the olddev.
i3c_master_add_i3c_dev_locked() { ... olddev = i3c_master_search_i3c_dev_duplicate(newdev); ... if (olddev) { ... i3c_dev_disable_ibi_locked(olddev); ^^^^^^ The olddev should not receive any commands on the i3c bus as it does not exist and has been assigned a new address. This will result in NACK or timeout. So remove it. }
i3c_dev_free_ibi_locked(olddev); ^^^^^^^^ This function internally calls i3c_dev_disable_ibi_locked() function causing to send DISEC command with old Address.
The olddev should not receive any commands on the i3c bus as it does not exist and has been assigned a new address. This will result in NACK or timeout. So, update the olddev->ibi->enabled flag to false to avoid DISEC with OldAddr. }
Include part of Ravindra Yashvant Shinde's work: https://lore.kernel.org/linux-i3c/20240820151917.3904956-1-ravindra.yashvant...
Fixes: 317bacf960a4 ("i3c: master: add enable(disable) hot join in sys entry") Co-developed-by: Ravindra Yashvant Shinde ravindra.yashvant.shinde@nxp.com Signed-off-by: Ravindra Yashvant Shinde ravindra.yashvant.shinde@nxp.com Reviewed-by: Miquel Raynal miquel.raynal@bootlin.com Signed-off-by: Frank Li Frank.Li@nxp.com Link: https://lore.kernel.org/r/20241001162232.223724-1-Frank.Li@nxp.com Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/i3c/master.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
--- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -2031,11 +2031,16 @@ int i3c_master_add_i3c_dev_locked(struct ibireq.max_payload_len = olddev->ibi->max_payload_len; ibireq.num_slots = olddev->ibi->num_slots;
- if (olddev->ibi->enabled) { + if (olddev->ibi->enabled) enable_ibi = true; - i3c_dev_disable_ibi_locked(olddev); - } - + /* + * The olddev should not receive any commands on the + * i3c bus as it does not exist and has been assigned + * a new address. This will result in NACK or timeout. + * So, update the olddev->ibi->enabled flag to false + * to avoid DISEC with OldAddr. + */ + olddev->ibi->enabled = false; i3c_dev_free_ibi_locked(olddev); } mutex_unlock(&olddev->ibi_lock);