From: Edwin Peer <edwin.peer@broadcom.com>
Date: Fri, 29 Oct 2021 03:47:51 -0400
Subject: bnxt_en: extract coredump command line from current task
Patch-mainline: v5.16-rc1
Git-commit: 4e59f0600790cc205192203570a677375671d1d7
References: jsc#SLE-18978
Tools other than 'ethtool -w' may be used to produce a coredump. For
devlink health, such dumps could even be driver initiated in response
to a health event. In these cases, the kernel thread information will
be placed in the coredump record instead.
v2: use min_t() instead of min() to fix the mismatched type warning
Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c | 26 ++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
@@ -194,6 +194,30 @@ bnxt_fill_coredump_seg_hdr(struct bnxt *
seg_hdr->instance = cpu_to_le32(instance);
}
+static void bnxt_fill_cmdline(struct bnxt_coredump_record *record)
+{
+ struct mm_struct *mm = current->mm;
+ int i, len, last = 0;
+
+ if (mm) {
+ len = min_t(int, mm->arg_end - mm->arg_start,
+ sizeof(record->commandline) - 1);
+ if (len && !copy_from_user(record->commandline,
+ (char __user *)mm->arg_start, len)) {
+ for (i = 0; i < len; i++) {
+ if (record->commandline[i])
+ last = i;
+ else
+ record->commandline[i] = ' ';
+ }
+ record->commandline[last + 1] = 0;
+ return;
+ }
+ }
+
+ strscpy(record->commandline, current->comm, TASK_COMM_LEN);
+}
+
static void
bnxt_fill_coredump_record(struct bnxt *bp, struct bnxt_coredump_record *record,
time64_t start, s16 start_utc, u16 total_segs,
@@ -219,7 +243,7 @@ bnxt_fill_coredump_record(struct bnxt *b
record->minute = cpu_to_le16(tm.tm_min);
record->second = cpu_to_le16(tm.tm_sec);
record->utc_bias = cpu_to_le16(start_utc);
- strcpy(record->commandline, "ethtool -w");
+ bnxt_fill_cmdline(record);
record->total_segments = cpu_to_le32(total_segs);
if (sscanf(utsname()->release, "%u.%u", &os_ver_major, &os_ver_minor) != 2)