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Sat, 25 Apr 2026 16:58:53 -0700 (PDT) Date: Sat, 25 Apr 2026 18:58:48 -0500 From: Corey Minyard To: Matt Fleming Cc: Matt Fleming , openipmi-developer@lists.sourceforge.net, Tony Camuso , linux-kernel@vger.kernel.org, kernel-team@cloudflare.com, stable@vger.kernel.org Subject: Re: [PATCH 2/2] ipmi: Add limits to event and receive message requests Message-ID: Reply-To: corey@minyard.net References: <20260421132544.2666174-1-corey@minyard.net> <20260421132544.2666174-3-corey@minyard.net> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Sat, Apr 25, 2026 at 10:36:05AM +0100, Matt Fleming wrote: > On Tue, Apr 21, 2026 at 07:42:44AM -0500, Corey Minyard wrote: > > The driver would just fetch events and receive messages until the > > BMC said it was done. To avoid issues with BMCs that never say they are > > done, add a limit of 10 fetches at a time. > > > > This is a more general fix than the previous fix for the specific bad > > BMC, but should fix the more general issue of a BMC that won't stop > > saying it has data. > > > > This has been there from the beginning of the driver. > > > > Reported-by: Matt Fleming > > Closes: https://lore.kernel.org/lkml/20260415115930.3428942-1-matt@readmodwrite.com/ > > Fixes: <1da177e4c3f4> ("Linux-2.6.12-rc2") > > Cc: stable@vger.kernel.org > > Signed-off-by: Corey Minyard > > --- > > drivers/char/ipmi/ipmi_si_intf.c | 15 +++++++++++++++ > > drivers/char/ipmi/ipmi_ssif.c | 15 +++++++++++++++ > > 2 files changed, 30 insertions(+) > > [...] > > > @@ -410,6 +413,7 @@ static void start_getting_msg_queue(struct smi_info *smi_info) > > > > start_new_msg(smi_info, smi_info->curr_msg->data, > > smi_info->curr_msg->data_size); > > + smi_info->num_requests_in_a_row = 0; > > smi_info->si_state = SI_GETTING_MESSAGES; > > } > > > > @@ -421,6 +425,7 @@ static void start_getting_events(struct smi_info *smi_info) > > > > start_new_msg(smi_info, smi_info->curr_msg->data, > > smi_info->curr_msg->data_size); > > + smi_info->num_requests_in_a_row = 0; > > smi_info->si_state = SI_GETTING_EVENTS; > > } > > > > Would it be better to move this zeroing to handle_transaction_done()? > Otherwise we reset the counter in handle_flags() -> > start_getting_events() and the threshold is never reached. Oh, yeah. Moving it to handle_transaction_done() is not ideal, though. If something was spewing receive messages, it would never get to events, which is why I did it like I did. The following should fix this. You could also have different limits for receive messages and events, but I think the following is more clear. diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c index 2a739123270c..e46f4150ceb5 100644 --- a/drivers/char/ipmi/ipmi_si_intf.c +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -413,8 +413,10 @@ static void start_getting_msg_queue(struct smi_info *smi_info) start_new_msg(smi_info, smi_info->curr_msg->data, smi_info->curr_msg->data_size); - smi_info->num_requests_in_a_row = 0; - smi_info->si_state = SI_GETTING_MESSAGES; + if (smi_info->si_state != SI_GETTING_MESSAGES) { + smi_info->num_requests_in_a_row = 0; + smi_info->si_state = SI_GETTING_MESSAGES; + } } static void start_getting_events(struct smi_info *smi_info) @@ -425,8 +427,10 @@ static void start_getting_events(struct smi_info *smi_info) start_new_msg(smi_info, smi_info->curr_msg->data, smi_info->curr_msg->data_size); - smi_info->num_requests_in_a_row = 0; - smi_info->si_state = SI_GETTING_EVENTS; + if (smi_info->si_state != SI_GETTING_EVENTS) { + smi_info->num_requests_in_a_row = 0; + smi_info->si_state = SI_GETTING_EVENTS; + } } /* > > Thanks, > Matt