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driver core: configurable deferred probe timeout #697

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Merged
sgaud-quic merged 3 commits into from
Jun 11, 2026
+14 −7
Merged

driver core: configurable deferred probe timeout #697

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dd99640
BACKPORT: driver core: Make deferred_probe_timeout default a Kconfig …
Mar 14, 2026
b9d9e3f
BACKPORT: Documentation: update deferred_probe_timeout cmdline parame…
Apr 16, 2026
f24eb44
QCLINUX: arm64: configs: qcom: Set DRIVER_DEFERRED_PROBE_TIMEOUT to 60
apateriy-qcom Jun 11, 2026
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5 changes: 3 additions & 2 deletions Documentation/admin-guide/kernel-parameters.txt
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Expand Up @@ -1144,8 +1144,9 @@
deferred probe to give up waiting on dependencies to
probe. Only specific dependencies (subsystems or
drivers) that have opted in will be ignored. A timeout
of 0 will timeout at the end of initcalls. If the time
out hasn't expired, it'll be restarted by each
of 0 will timeout at the end of initcalls; a negative
value is treated as an infinite timeout value. If the
timeout hasn't expired, it'll be restarted by each
successful driver registration. This option will also
dump out devices still on the deferred probe list after
retrying.
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1 change: 1 addition & 0 deletions arch/arm64/configs/qcom.config
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Expand Up @@ -24,6 +24,7 @@ CONFIG_CPU_IDLE_THERMAL=y
CONFIG_DMABUF_HEAPS=y
CONFIG_DMABUF_HEAPS_CMA=y
CONFIG_DMABUF_HEAPS_SYSTEM=y
CONFIG_DRIVER_DEFERRED_PROBE_TIMEOUT=60
CONFIG_EDAC_QCOM=m
CONFIG_EXPERT=y
CONFIG_FW_LOADER_COMPRESS=y
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9 changes: 9 additions & 0 deletions drivers/base/Kconfig
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Expand Up @@ -73,6 +73,15 @@ config DEVTMPFS_SAFE
with the PROT_EXEC flag. This can break, for example, non-KMS
video drivers.

config DRIVER_DEFERRED_PROBE_TIMEOUT
int "Default value for deferred_probe_timeout"
default 0 if !MODULES
default 10 if MODULES
help
Set the default value for the deferred_probe_timeout kernel parameter.
See Documentation/admin-guide/kernel-parameters.txt for a description
of the deferred_probe_timeout kernel parameter.

config STANDALONE
bool "Select only drivers that don't need compile-time external firmware"
default y
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6 changes: 1 addition & 5 deletions drivers/base/dd.c
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Expand Up @@ -257,11 +257,7 @@ static int deferred_devs_show(struct seq_file *s, void *data)
}
DEFINE_SHOW_ATTRIBUTE(deferred_devs);

#ifdef CONFIG_MODULES
static int driver_deferred_probe_timeout = 15;
#else
static int driver_deferred_probe_timeout;
#endif
static int driver_deferred_probe_timeout = CONFIG_DRIVER_DEFERRED_PROBE_TIMEOUT;

static int __init deferred_probe_timeout_setup(char *str)
{
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