wireguard-linux/drivers/char/ipmi, branch stable

ipmi: Fix handling of messages with provided receive message pointer

2025-10-07T11:50:08Z

Prior to commit b52da4054ee0 ("ipmi: Rework user message limit handling"), i_ipmi_request() used to increase the user reference counter if the receive message is provided by the caller of IPMI API functions. This is no longer the case. However, ipmi_free_recv_msg() is still called and decreases the reference counter. This results in the reference counter reaching zero, the user data pointer is released, and all kinds of interesting crashes are seen. Fix the problem by increasing user reference counter if the receive message has been provided by the caller. Fixes: b52da4054ee0 ("ipmi: Rework user message limit handling") Reported-by: Eric Dumazet Cc: Eric Dumazet Cc: Greg Thelen Signed-off-by: Guenter Roeck Message-ID: <20251006201857.3433837-1-linux@roeck-us.net> Signed-off-by: Corey Minyard

ipmi: Add Loongson-2K BMC support

2025-09-16T15:15:54Z

This patch adds Loongson-2K BMC IPMI support. According to the existing design, we use software simulation to implement the KCS interface registers: Stauts/Command/Data_Out/Data_In. Also since both host side and BMC side read and write kcs status, fifo flag is used to ensure data consistency. The single KCS message block is as follows: +-------------------------------------------------------------------------+ |FIFO flags| KCS register data | CMD data | KCS version | WR REQ | WR ACK | +-------------------------------------------------------------------------+ Co-developed-by: Chong Qiao Signed-off-by: Chong Qiao Reviewed-by: Huacai Chen Acked-by: Corey Minyard Signed-off-by: Binbin Zhou Message-ID: <8f9ffb6f0405345af8f04193ce1510aacd075e72.1756987761.git.zhoubinbin@loongson.cn> Signed-off-by: Corey Minyard

ipmi:si: Gracefully handle if the BMC is non-functional

2025-09-08T15:21:41Z

If the BMC is not functional, the driver goes into an error state and starts a 1 second timer. When the timer times out, it will attempt a simple message. If the BMC interacts correctly, the driver will start accepting messages again. If not, it remains in error state. If the driver goes into error state, all messages current and pending will return with an error. This should more gracefully handle when the BMC becomes non-operational, as opposed to trying each messages individually and failing them. Signed-off-by: Corey Minyard

ipmi: Rename "user_data" to "recv_msg" in an SMI message

2025-09-08T15:21:41Z

It's only used to hold the corresponding receive message, so fix the name to make that clear and the type so nothing else can be accidentally assigned to it. Signed-off-by: Corey Minyard

ipmi: Allow an SMI sender to return an error

2025-09-08T15:21:41Z

Getting ready for handling when a BMC is non-responsive or broken, allow the sender operation to fail in an SMI. If it was a user-generated message it will return the error. The powernv code was already doing this internally, but the way it was written could result in deep stack descent if there were a lot of messages queued. Have its send return an error in this case. Signed-off-by: Corey Minyard

ipmi:si: Move flags get start to its own function

2025-09-08T15:21:41Z

It's about to be used from another place, and this looks better, anyway. Signed-off-by: Corey Minyard

ipmi:si: Merge some if statements

2025-09-08T15:21:41Z

Changes resulted in a silly looking piece of logic. Get rid of a goto and use if statements properly. Signed-off-by: Corey Minyard

ipmi: Set a timer for maintenance mode

2025-09-08T15:21:41Z

Now that maintenance mode rejects all messages, there's nothing to run time timer. Make sure the timer is running in maintenance mode. Signed-off-by: Corey Minyard Tested-by: Frederick Lawler

ipmi: Add a maintenance mode sysfs file

2025-09-08T15:21:41Z

So you can see if it's in maintenance mode and see how long is left. Signed-off-by: Corey Minyard Tested-by: Frederick Lawler

ipmi: Disable sysfs access and requests in maintenance mode

2025-09-08T15:21:41Z

If the driver goes into any maintenance mode, disable sysfs access until it is done. If the driver goes into reset maintenance mode, disable all messages until it is done. Signed-off-by: Corey Minyard Tested-by: Frederick Lawler