ACPI/IORT: Remove erroneous id_count check in iort_node_get_rmr_info()
authorGuanghui Feng <guanghuifeng@linux.alibaba.com>
Mon, 17 Jul 2023 11:33:45 +0000 (19:33 +0800)
committerCatalin Marinas <catalin.marinas@arm.com>
Fri, 28 Jul 2023 13:50:50 +0000 (14:50 +0100)
commit003e6b56d780095a9adc23efc9cb4b4b4717169b
tree6a8b2599086f55ad2c9cb0f74dd0900ecbf88d95
parent05d881b85b48c7ac6a7c92ce00aa916c4a84d052
ACPI/IORT: Remove erroneous id_count check in iort_node_get_rmr_info()

According to the ARM IORT specifications DEN 0049 issue E,
the "Number of IDs" field in the ID mapping format reports
the number of IDs in the mapping range minus one.

In iort_node_get_rmr_info(), we erroneously skip ID mappings
whose "Number of IDs" equal to 0, resulting in valid mapping
nodes with a single ID to map being skipped, which is wrong.

Fix iort_node_get_rmr_info() by removing the bogus id_count
check.

Fixes: 491cf4a6735a ("ACPI/IORT: Add support to retrieve IORT RMR reserved regions")
Signed-off-by: Guanghui Feng <guanghuifeng@linux.alibaba.com>
Cc: <stable@vger.kernel.org> # 6.0.x
Acked-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Link: https://lore.kernel.org/r/1689593625-45213-1-git-send-email-guanghuifeng@linux.alibaba.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
drivers/acpi/arm64/iort.c