firmware: dmi-sysfs: make pr_info messages rate limited

Currently if a process repeat repeatedly reads the dmi sysfs raw event log
/sys/firmware/dmi/entries/15-0/system_event_log/raw_event_log when GPNV
support is missing or using an unknown access method the kernel log gets
spammed with info messages. Make the messages rate limited to reduce the
message spamming. Triggered when running sudo stress-ng --sysfs -t 5m.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20221129223855.1005674-1-colin.i.king@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/firmware/dmi-sysfs.c b/drivers/firmware/dmi-sysfs.c
index 66727ad3361b992d0c70ba20f4b62e7080965917..9b6ce172175c25a76ef0d2f9fa59e31ea21dcbc4 100644 (file)
--- a/drivers/firmware/dmi-sysfs.c
+++ b/drivers/firmware/dmi-sysfs.c
@@ -418,10 +418,10 @@ static ssize_t dmi_sel_raw_read_helper(struct dmi_sysfs_entry *entry,
                return dmi_sel_raw_read_phys32(entry, &sel, state->buf,
                                               state->pos, state->count);
        case DMI_SEL_ACCESS_METHOD_GPNV:
-               pr_info("dmi-sysfs: GPNV support missing.\n");
+               pr_info_ratelimited("dmi-sysfs: GPNV support missing.\n");
                return -EIO;
        default:
-               pr_info("dmi-sysfs: Unknown access method %02x\n",
+               pr_info_ratelimited("dmi-sysfs: Unknown access method %02x\n",
                        sel.access_method);
                return -EIO;
        }