From d43ac48de222318c621dccb5b140e46676779736 Mon Sep 17 00:00:00 2001 From: Mukesh Ojha Date: Thu, 26 Oct 2023 19:57:39 +0530 Subject: [PATCH] BACKPORT: firmware_loader: Abort all upcoming firmware load request once reboot triggered There could be following scenario where there is a ongoing reboot is going from processA which tries to call all the reboot notifier callback and one of them is firmware reboot call which tries to abort all the ongoing firmware userspace request under fw_lock but there could be another processB which tries to do request firmware, which came just after abort done from ProcessA and ask for userspace to load the firmware and this can stop the ongoing reboot ProcessA to stall for next 60s(default timeout) which may not be expected behaviour everyone like to see, instead we should abort any firmware load request which came once firmware knows about the reboot through notification. ProcessA ProcessB kernel_restart_prepare blocking_notifier_call_chain fw_shutdown_notify kill_pending_fw_fallback_reqs __fw_load_abort fw_state_aborted request_firmware __fw_state_set firmware_fallback_sysfs ... fw_load_from_user_helper .. ... . .. usermodehelper_read_trylock fw_load_sysfs_fallback fw_sysfs_wait_timeout usermodehelper_disable __usermodehelper_disable down_write() Bug: 309378049 Change-Id: I61eb91f21a01460f340f890b25c60de7597a87ff Signed-off-by: Mukesh Ojha Acked-by: Luis Chamberlain Link: https://lore.kernel.org/r/1698330459-31776-2-git-send-email-quic_mojha@quicinc.com Signed-off-by: Greg Kroah-Hartman (cherry picked from commit effd7c70eaa0440688b60b9d419243695ede3c45) Signed-off-by: Srinivasarao Pathipati --- drivers/base/firmware_loader/fallback.c | 6 +++++- drivers/base/firmware_loader/firmware.h | 1 + drivers/base/firmware_loader/main.c | 1 + 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c index 8c172f545681..f84ada93452f 100644 --- a/drivers/base/firmware_loader/fallback.c +++ b/drivers/base/firmware_loader/fallback.c @@ -114,6 +114,10 @@ void kill_pending_fw_fallback_reqs(bool kill_all) if (kill_all || !fw_priv->need_uevent) __fw_load_abort(fw_priv); } + + if (kill_all) + fw_load_abort_all = true; + mutex_unlock(&fw_lock); } @@ -510,7 +514,7 @@ static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs, } mutex_lock(&fw_lock); - if (fw_state_is_aborted(fw_priv)) { + if (fw_load_abort_all || fw_state_is_aborted(fw_priv)) { mutex_unlock(&fw_lock); retval = -EINTR; goto out; diff --git a/drivers/base/firmware_loader/firmware.h b/drivers/base/firmware_loader/firmware.h index ffb2a2724cc5..d7c05fc20a08 100644 --- a/drivers/base/firmware_loader/firmware.h +++ b/drivers/base/firmware_loader/firmware.h @@ -78,6 +78,7 @@ struct fw_priv { }; extern struct mutex fw_lock; +extern bool fw_load_abort_all; static inline bool __fw_state_check(struct fw_priv *fw_priv, enum fw_status status) diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c index 12dfbeeed558..82f43b74a456 100644 --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -90,6 +90,7 @@ static inline struct fw_priv *to_fw_priv(struct kref *ref) DEFINE_MUTEX(fw_lock); static struct firmware_cache fw_cache; +bool fw_load_abort_all; /* Builtin firmware support */