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| author |   Saravana Kannan <saravanak@google.com> | 2022-05-03 17:53:43 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-19 19:28:24 +0200 |
| commit | f79f662e4cd56f6fd3436dd68057d2ec1f7d2025 (patch) | |
| tree | 777d1eb60a26ebdd5700bc20b3094fc2eec77b24 | |
| parent | driver core: location: Check for allocations failure (diff) | |
| download | linux-dev-f79f662e4cd56f6fd3436dd68057d2ec1f7d2025.tar.xz linux-dev-f79f662e4cd56f6fd3436dd68057d2ec1f7d2025.zip | |
driver core: Add "*" wildcard support to driver_async_probe cmdline param
There's currently no way to use driver_async_probe kernel cmdline param
to enable default async probe for all drivers. So, add support for "*"
to match with all driver names. When "*" is used, all other drivers
listed in driver_async_probe are drivers that will NOT match the "*".
For example:
* driver_async_probe=drvA,drvB,drvC
drvA, drvB and drvC do asynchronous probing.
* driver_async_probe=*
All drivers do asynchronous probing except those that have set
PROBE_FORCE_SYNCHRONOUS flag.
* driver_async_probe=*,drvA,drvB,drvC
All drivers do asynchronous probing except drvA, drvB, drvC and those
that have set PROBE_FORCE_SYNCHRONOUS flag.
Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Feng Tang <feng.tang@intel.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20220504005344.117803-1-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 5 | ||||
| -rw-r--r-- | drivers/base/dd.c | 9 |
2 files changed, 12 insertions, 2 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 3f1cc5e317ed..c7513d01df82 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1076,7 +1076,10 @@ driver later using sysfs. driver_async_probe= [KNL] - List of driver names to be probed asynchronously. + List of driver names to be probed asynchronously. * + matches with all driver names. If * is specified, the + rest of the listed driver names are those that will NOT + match the *. Format: <driver_name1>,<driver_name2>... drm.edid_firmware=[<connector>:]<file>[,[<connector>:]<file>] diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 39c70fc0f4cb..810f45c731aa 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -60,6 +60,7 @@ static bool initcalls_done; /* Save the async probe drivers' name from kernel cmdline */ #define ASYNC_DRV_NAMES_MAX_LEN 256 static char async_probe_drv_names[ASYNC_DRV_NAMES_MAX_LEN]; +static bool async_probe_default; /* * In some cases, like suspend to RAM or hibernation, It might be reasonable @@ -797,7 +798,11 @@ static int driver_probe_device(struct device_driver *drv, struct device *dev) static inline bool cmdline_requested_async_probing(const char *drv_name) { - return parse_option_str(async_probe_drv_names, drv_name); + bool async_drv; + + async_drv = parse_option_str(async_probe_drv_names, drv_name); + + return (async_probe_default != async_drv); } /* The option format is "driver_async_probe=drv_name1,drv_name2,..." */ @@ -807,6 +812,8 @@ static int __init save_async_options(char *buf) pr_warn("Too long list of driver names for 'driver_async_probe'!\n"); strlcpy(async_probe_drv_names, buf, ASYNC_DRV_NAMES_MAX_LEN); + async_probe_default = parse_option_str(async_probe_drv_names, "*"); + return 1; } __setup("driver_async_probe=", save_async_options); |