linux-kernel - [PATCH 1/2] i3c: master: Free the old_dyn

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Date:   Mon, 26 Sep 2022 18:51:44 +0800
From:   Billy Tsai <billy_tsai@...eedtech.com>
To:     <alexandre.belloni@...tlin.com>, <linux-i3c@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <BMC-SW@...eedtech.com>
Subject: [PATCH 1/2] i3c: master: Free the old_dyn_addr when reattach.

This patch is used to free the old_dyn_addr when the caller want to
reattach the device to the different dynamic address. If the
old_dyn_addr is 0 the function will treat it as no old_dyn_addr is
reserved on the bus. Without the patch, when the driver reattach the i3c
device after setnewda the old_dyn_addr will be permanently occupied.

Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
---
 drivers/i3c/master.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 7850287dfe7a..6349ce0ce835 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1379,6 +1379,9 @@ static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
 		i3c_bus_set_addr_slot_status(&master->bus,
 					     dev->info.dyn_addr,
 					     I3C_ADDR_SLOT_I3C_DEV);
+		if (old_dyn_addr)
+			i3c_bus_set_addr_slot_status(&master->bus, old_dyn_addr,
+						     I3C_ADDR_SLOT_FREE);
 	}
 
 	if (master->ops->reattach_i3c_dev) {
-- 
2.25.1