1 files changed, 91 insertions, 81 deletions

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index fd0cc016a099..385a6059714a 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -41,6 +41,8 @@
 #include <linux/interrupt.h>
 #include <linux/cper.h>
 #include <linux/kdebug.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
 #include <acpi/apei.h>
 #include <acpi/atomicio.h>
 #include <acpi/hed.h>
@@ -87,6 +89,7 @@ struct ghes {
  * used for that.
  */
 static LIST_HEAD(ghes_sci);
+static DEFINE_MUTEX(ghes_list_mutex);
 
 static struct ghes *ghes_new(struct acpi_hest_generic *generic)
 {
@@ -132,26 +135,26 @@ static void ghes_fini(struct ghes *ghes)
 }
 
 enum {
-        GHES_SER_NO = 0x0,
-        GHES_SER_CORRECTED = 0x1,
-        GHES_SER_RECOVERABLE = 0x2,
-        GHES_SER_PANIC = 0x3,
+        GHES_SEV_NO = 0x0,
+        GHES_SEV_CORRECTED = 0x1,
+        GHES_SEV_RECOVERABLE = 0x2,
+        GHES_SEV_PANIC = 0x3,
 };
 
 static inline int ghes_severity(int severity)
 {
         switch (severity) {
-        case CPER_SER_INFORMATIONAL:
-                return GHES_SER_NO;
-        case CPER_SER_CORRECTED:
-                return GHES_SER_CORRECTED;
-        case CPER_SER_RECOVERABLE:
-                return GHES_SER_RECOVERABLE;
-        case CPER_SER_FATAL:
-                return GHES_SER_PANIC;
+        case CPER_SEV_INFORMATIONAL:
+                return GHES_SEV_NO;
+        case CPER_SEV_CORRECTED:
+                return GHES_SEV_CORRECTED;
+        case CPER_SEV_RECOVERABLE:
+                return GHES_SEV_RECOVERABLE;
+        case CPER_SEV_FATAL:
+                return GHES_SEV_PANIC;
         default:
                 /* Unkown, go panic */
-                return GHES_SER_PANIC;
+                return GHES_SEV_PANIC;
         }
 }
 
@@ -237,16 +240,16 @@ static void ghes_clear_estatus(struct ghes *ghes)
 
 static void ghes_do_proc(struct ghes *ghes)
 {
-        int ser, processed = 0;
+        int sev, processed = 0;
         struct acpi_hest_generic_data *gdata;
 
-        ser = ghes_severity(ghes->estatus->error_severity);
+        sev = ghes_severity(ghes->estatus->error_severity);
         apei_estatus_for_each_section(ghes->estatus, gdata) {
 #ifdef CONFIG_X86_MCE
                 if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
                                  CPER_SEC_PLATFORM_MEM)) {
                         apei_mce_report_mem_error(
-                                ser == GHES_SER_CORRECTED,
+                                sev == GHES_SEV_CORRECTED,
                                 (struct cper_sec_mem_err *)(gdata+1));
                         processed = 1;
                 }
@@ -293,18 +296,15 @@ static struct notifier_block ghes_notifier_sci = {
         .notifier_call = ghes_notify_sci,
 };
 
-static int hest_ghes_parse(struct acpi_hest_header *hest_hdr, void *data)
+static int __devinit ghes_probe(struct platform_device *ghes_dev)
 {
         struct acpi_hest_generic *generic;
         struct ghes *ghes = NULL;
-        int rc = 0;
+        int rc = -EINVAL;
 
-        if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
-                return 0;
-
-        generic = (struct acpi_hest_generic *)hest_hdr;
+        generic = ghes_dev->dev.platform_data;
         if (!generic->enabled)
-                return 0;
+                return -ENODEV;
 
         if (generic->error_block_length <
             sizeof(struct acpi_hest_generic_status)) {
@@ -327,62 +327,91 @@ static int hest_ghes_parse(struct acpi_hest_header *hest_hdr, void *data)
                 ghes = NULL;
                 goto err;
         }
-        switch (generic->notify.type) {
-        case ACPI_HEST_NOTIFY_POLLED:
-                pr_warning(GHES_PFX
-"Generic hardware error source: %d notified via POLL is not supported!\n",
-                           generic->header.source_id);
-                break;
-        case ACPI_HEST_NOTIFY_EXTERNAL:
-        case ACPI_HEST_NOTIFY_LOCAL:
-                pr_warning(GHES_PFX
-"Generic hardware error source: %d notified via IRQ is not supported!\n",
-                           generic->header.source_id);
-                break;
-        case ACPI_HEST_NOTIFY_SCI:
+        if (generic->notify.type == ACPI_HEST_NOTIFY_SCI) {
+                mutex_lock(&ghes_list_mutex);
                 if (list_empty(&ghes_sci))
                         register_acpi_hed_notifier(&ghes_notifier_sci);
                 list_add_rcu(&ghes->list, &ghes_sci);
-                break;
-        case ACPI_HEST_NOTIFY_NMI:
-                pr_warning(GHES_PFX
-"Generic hardware error source: %d notified via NMI is not supported!\n",
-                           generic->header.source_id);
-                break;
-        default:
-                pr_warning(FW_WARN GHES_PFX
-        "Unknown notification type: %u for generic hardware error source: %d\n",
-                           generic->notify.type, generic->header.source_id);
-                break;
+                mutex_unlock(&ghes_list_mutex);
+        } else {
+                unsigned char *notify = NULL;
+
+                switch (generic->notify.type) {
+                case ACPI_HEST_NOTIFY_POLLED:
+                        notify = "POLL";
+                        break;
+                case ACPI_HEST_NOTIFY_EXTERNAL:
+                case ACPI_HEST_NOTIFY_LOCAL:
+                        notify = "IRQ";
+                        break;
+                case ACPI_HEST_NOTIFY_NMI:
+                        notify = "NMI";
+                        break;
+                }
+                if (notify) {
+                        pr_warning(GHES_PFX
+"Generic hardware error source: %d notified via %s is not supported!\n",
+                                   generic->header.source_id, notify);
+                } else {
+                        pr_warning(FW_WARN GHES_PFX
+"Unknown notification type: %u for generic hardware error source: %d\n",
+                        generic->notify.type, generic->header.source_id);
+                }
+                rc = -ENODEV;
+                goto err;
         }
+        platform_set_drvdata(ghes_dev, ghes);
 
         return 0;
 err:
-        if (ghes)
+        if (ghes) {
                 ghes_fini(ghes);
+                kfree(ghes);
+        }
         return rc;
 }
 
-static void ghes_cleanup(void)
+static int __devexit ghes_remove(struct platform_device *ghes_dev)
 {
-        struct ghes *ghes, *nghes;
+        struct ghes *ghes;
+        struct acpi_hest_generic *generic;
 
-        if (!list_empty(&ghes_sci))
-                unregister_acpi_hed_notifier(&ghes_notifier_sci);
+        ghes = platform_get_drvdata(ghes_dev);
+        generic = ghes->generic;
+
+        switch (generic->notify.type) {
+        case ACPI_HEST_NOTIFY_SCI:
+                mutex_lock(&ghes_list_mutex);
+                list_del_rcu(&ghes->list);
+                if (list_empty(&ghes_sci))
+                        unregister_acpi_hed_notifier(&ghes_notifier_sci);
+                mutex_unlock(&ghes_list_mutex);
+                break;
+        default:
+                BUG();
+                break;
+        }
 
         synchronize_rcu();
+        ghes_fini(ghes);
+        kfree(ghes);
 
-        list_for_each_entry_safe(ghes, nghes, &ghes_sci, list) {
-                list_del(&ghes->list);
-                ghes_fini(ghes);
-                kfree(ghes);
-        }
+        platform_set_drvdata(ghes_dev, NULL);
+
+        return 0;
 }
 
+static struct platform_driver ghes_platform_driver = {
+        .driver         = {
+                .name   = "GHES",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = ghes_probe,
+        .remove         = ghes_remove,
+};
+
 static int __init ghes_init(void)
 {
-        int rc;
-
         if (acpi_disabled)
                 return -ENODEV;
 
@@ -391,32 +420,12 @@ static int __init ghes_init(void)
                 return -EINVAL;
         }
 
-        rc = apei_hest_parse(hest_ghes_parse, NULL);
-        if (rc) {
-                pr_err(GHES_PFX
-                "Error during parsing HEST generic hardware error sources.\n");
-                goto err_cleanup;
-        }
-
-        if (list_empty(&ghes_sci)) {
-                pr_info(GHES_PFX
-                        "No functional generic hardware error sources.\n");
-                rc = -ENODEV;
-                goto err_cleanup;
-        }
-
-        pr_info(GHES_PFX
-                "Generic Hardware Error Source support is initialized.\n");
-
-        return 0;
-err_cleanup:
-        ghes_cleanup();
-        return rc;
+        return platform_driver_register(&ghes_platform_driver);
 }
 
 static void __exit ghes_exit(void)
 {
-        ghes_cleanup();
+        platform_driver_unregister(&ghes_platform_driver);
 }
 
 module_init(ghes_init);
@@ -425,3 +434,4 @@ module_exit(ghes_exit);
 MODULE_AUTHOR("Huang Ying");
 MODULE_DESCRIPTION("APEI Generic Hardware Error Source support");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:GHES");