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| author | Corey Minyard <corey@minyard.net> | 2025-08-20 19:03:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-10-19 17:33:52 +0300 |
| commit | b9cc7155e65f6feca51bfedd543b9bd300e2be2b (patch) | |
| tree | 4146236ebf0663023a5dba5c0c3fa1e275f62ca5 /drivers/char | |
| parent | d9457e6258750692c3b27f80880a613178053c25 (diff) | |
| download | linux-b9cc7155e65f6feca51bfedd543b9bd300e2be2b.tar.xz | |
Revert "ipmi: fix msg stack when IPMI is disconnected"
commit 5d09ee1bec870263f4ace439402ea840503b503b upstream.
This reverts commit c608966f3f9c2dca596967501d00753282b395fc.
This patch has a subtle bug that can cause the IPMI driver to go into an
infinite loop if the BMC misbehaves in a certain way. Apparently
certain BMCs do misbehave this way because several reports have come in
recently about this.
Signed-off-by: Corey Minyard <corey@minyard.net>
Tested-by: Eric Hagberg <ehagberg@janestreet.com>
Cc: <stable@vger.kernel.org> # 6.2
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/ipmi/ipmi_kcs_sm.c | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/drivers/char/ipmi/ipmi_kcs_sm.c b/drivers/char/ipmi/ipmi_kcs_sm.c index ecfcb50302f6..efda90dcf5b3 100644 --- a/drivers/char/ipmi/ipmi_kcs_sm.c +++ b/drivers/char/ipmi/ipmi_kcs_sm.c @@ -122,10 +122,10 @@ struct si_sm_data { unsigned long error0_timeout; }; -static unsigned int init_kcs_data_with_state(struct si_sm_data *kcs, - struct si_sm_io *io, enum kcs_states state) +static unsigned int init_kcs_data(struct si_sm_data *kcs, + struct si_sm_io *io) { - kcs->state = state; + kcs->state = KCS_IDLE; kcs->io = io; kcs->write_pos = 0; kcs->write_count = 0; @@ -140,12 +140,6 @@ static unsigned int init_kcs_data_with_state(struct si_sm_data *kcs, return 2; } -static unsigned int init_kcs_data(struct si_sm_data *kcs, - struct si_sm_io *io) -{ - return init_kcs_data_with_state(kcs, io, KCS_IDLE); -} - static inline unsigned char read_status(struct si_sm_data *kcs) { return kcs->io->inputb(kcs->io, 1); @@ -276,7 +270,7 @@ static int start_kcs_transaction(struct si_sm_data *kcs, unsigned char *data, if (size > MAX_KCS_WRITE_SIZE) return IPMI_REQ_LEN_EXCEEDED_ERR; - if (kcs->state != KCS_IDLE) { + if ((kcs->state != KCS_IDLE) && (kcs->state != KCS_HOSED)) { dev_warn(kcs->io->dev, "KCS in invalid state %d\n", kcs->state); return IPMI_NOT_IN_MY_STATE_ERR; } @@ -501,7 +495,7 @@ static enum si_sm_result kcs_event(struct si_sm_data *kcs, long time) } if (kcs->state == KCS_HOSED) { - init_kcs_data_with_state(kcs, kcs->io, KCS_ERROR0); + init_kcs_data(kcs, kcs->io); return SI_SM_HOSED; } |