ACPI, APEI, HEST, Detect duplicated hardware error source ID

The firmware on some machine will report duplicated hardware error
source ID in HEST.  This is considered a firmware bug.  To provide
better warning message, this patch adds duplicated hardware error
source ID detecting and corresponding printk.

This patch fixes #37412 on kernel bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=37412

Reported-by: marconifabio@ubuntu-it.org
Signed-off-by: Huang Ying <ying.huang@intel.com>
Tested-by: Mathias <janedo.spam@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index abda3786a5d70c4b22738b1245303dbabe2722d6..181bc2f7bb7411a4b300c23c2450ad79ae129a4b 100644 (file)
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -139,13 +139,23 @@ static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
 {
        struct platform_device *ghes_dev;
        struct ghes_arr *ghes_arr = data;
-       int rc;
+       int rc, i;
 
        if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
                return 0;
 
        if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
                return 0;
+       for (i = 0; i < ghes_arr->count; i++) {
+               struct acpi_hest_header *hdr;
+               ghes_dev = ghes_arr->ghes_devs[i];
+               hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
+               if (hdr->source_id == hest_hdr->source_id) {
+                       pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
+                                  hdr->source_id);
+                       return -EIO;
+               }
+       }
        ghes_dev = platform_device_alloc("GHES", hest_hdr->source_id);
        if (!ghes_dev)
                return -ENOMEM;