Merge tag 'ffa-fix-6.15' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes

Arm FF-A fix for v6.15

A fix that addresses incorrect release of Rx buffer ownership in the
driver. The fix specificially avoids releasing Rx buffer ownership with
FFA_RX_RELEASE if it wasn’t acquired during a FFA_PARTITION_INFO_GET call
that only requested the partition count. This prevents unnecessary errors
like FFA_RET_DENIED from firmware when buffers are not actually owned by
the driver.

* tag 'ffa-fix-6.15' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_ffa: Skip Rx buffer ownership release if not acquired

Author: arndb

drivers/firmware/arm_ffa/driver.c

@@ -299,7 +299,8 @@ __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
 				import_uuid(&buf->uuid, (u8 *)&rx_buf->uuid);
 		}
 
-	ffa_rx_release();
+	if (!(flags & PARTITION_INFO_GET_RETURN_COUNT_ONLY))
+		ffa_rx_release();
 
 	mutex_unlock(&drv_info->rx_lock);