This is a note to let you know that I've just added the patch titled
firmware: arm_ffa: Assign the missing IDR allocation ID to the FFA device
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
firmware-arm_ffa-assign-the-missing-idr-allocation-i.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b9b6b78ff78fa1b883a3dda105c6ee1e6649b7a7
Author: Sudeep Holla <sudeep.holla@xxxxxxx>
Date: Tue Oct 3 09:59:32 2023 +0100
firmware: arm_ffa: Assign the missing IDR allocation ID to the FFA device
[ Upstream commit 7d0bc6360f17ea323ab25939a34857123d7d87e5 ]
Commit 19b8766459c4 ("firmware: arm_ffa: Fix FFA device names for logical
partitions") added an ID to the FFA device using ida_alloc() and append
the same to "arm-ffa" to make up a unique device name. However it missed
to stash the id value in ffa_dev to help freeing the ID later when the
device is destroyed.
Due to the missing/unassigned ID in FFA device, we get the following
warning when the FF-A device is unregistered.
| ida_free called for id=0 which is not allocated.
| WARNING: CPU: 7 PID: 1 at lib/idr.c:525 ida_free+0x114/0x164
| CPU: 7 PID: 1 Comm: swapper/0 Not tainted 6.6.0-rc4 #209
| pstate: 61400009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
| pc : ida_free+0x114/0x164
| lr : ida_free+0x114/0x164
| Call trace:
| ida_free+0x114/0x164
| ffa_release_device+0x24/0x3c
| device_release+0x34/0x8c
| kobject_put+0x94/0xf8
| put_device+0x18/0x24
| klist_devices_put+0x14/0x20
| klist_next+0xc8/0x114
| bus_for_each_dev+0xd8/0x144
| arm_ffa_bus_exit+0x30/0x54
| ffa_init+0x68/0x330
| do_one_initcall+0xdc/0x250
| do_initcall_level+0x8c/0xac
| do_initcalls+0x54/0x94
| do_basic_setup+0x1c/0x28
| kernel_init_freeable+0x104/0x170
| kernel_init+0x20/0x1a0
| ret_from_fork+0x10/0x20
Fix the same by actually assigning the ID in the FFA device this time
for real.
Fixes: 19b8766459c4 ("firmware: arm_ffa: Fix FFA device names for logical partitions")
Link: https://lore.kernel.org/r/20231003085932.3553985-1-sudeep.holla@xxxxxxx
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c
index edef31c413123..f79ba6f733ba4 100644
--- a/drivers/firmware/arm_ffa/bus.c
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -192,6 +192,7 @@ struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id)
dev->release = ffa_release_device;
dev_set_name(&ffa_dev->dev, "arm-ffa-%d", id);
+ ffa_dev->id = id;
ffa_dev->vm_id = vm_id;
uuid_copy(&ffa_dev->uuid, uuid);
