linux-kernel - [PATCH 2/2] firmware: arm_ffa: Allow multiple UUIDs per partition

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Message-Id: <e7990bc3dc128e5056c3bad381e548a49ab67c81.1737522729.git.viresh.kumar@linaro.org>
Date: Wed, 22 Jan 2025 10:53:43 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Sudeep Holla <sudeep.holla@....com>
Cc: Viresh Kumar <viresh.kumar@...aro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Bill Mills <bill.mills@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] firmware: arm_ffa: Allow multiple UUIDs per partition

A partition can implement multiple UUIDs and adding the same partition
twice will fail. Don't try to add a partition again, if it is already
added earlier.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/firmware/arm_ffa/driver.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index b824c7c024fd..6de941821319 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -1389,6 +1389,10 @@ static int ffa_add_partition_info(int vm_id)
 	struct ffa_dev_part_info *info;
 	int ret;
 
+	/* Already added ? */
+	if (xa_load(&drv_info->partition_info, vm_id))
+		return 0;
+
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
-- 
2.31.1.272.g89b43f80a514