diff options
| author | Guilherme G. Piccoli <gpiccoli@igalia.com> | 2022-10-13 18:06:46 -0300 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-10-19 09:25:39 -0700 |
| commit | 38b91847c314f49c80e30062549d4709a3754ea6 (patch) | |
| tree | d754192d910ceaff2bf4517dc7faeff0e8854891 /fs/pstore/platform.c | |
| parent | 7d7eca411fa0c662693613805107494a9dc7477f (diff) | |
| download | lwn-38b91847c314f49c80e30062549d4709a3754ea6.tar.gz lwn-38b91847c314f49c80e30062549d4709a3754ea6.zip | |
pstore: Alert on backend write error
The pstore dump function doesn't alert at all on errors - despite
pstore is usually a last resource and if it fails users won't be
able to read the kernel log, this is not the case for server users
with serial access, for example.
So, let's at least attempt to inform such advanced users on the first
backend writing error detected during the kmsg dump - this is also
very useful for pstore debugging purposes.
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221013210648.137452-2-gpiccoli@igalia.com
Diffstat (limited to 'fs/pstore/platform.c')
| -rw-r--r-- | fs/pstore/platform.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 06c2c66af332..cbc0b468c1ab 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -393,6 +393,7 @@ static void pstore_dump(struct kmsg_dumper *dumper, const char *why; unsigned int part = 1; unsigned long flags = 0; + int saved_ret = 0; int ret; why = kmsg_dump_reason_str(reason); @@ -463,12 +464,21 @@ static void pstore_dump(struct kmsg_dumper *dumper, if (ret == 0 && reason == KMSG_DUMP_OOPS) { pstore_new_entry = 1; pstore_timer_kick(); + } else { + /* Preserve only the first non-zero returned value. */ + if (!saved_ret) + saved_ret = ret; } total += record.size; part++; } spin_unlock_irqrestore(&psinfo->buf_lock, flags); + + if (saved_ret) { + pr_err_once("backend (%s) writing error (%d)\n", psinfo->name, + saved_ret); + } } static struct kmsg_dumper pstore_dumper = { |