Zeng Heng dd2922dcfa fs/resctrl: Restore the rdt_last_cmd_clear() calls after acquiring rdtgroup_mutex ...

A lockdep fix removed two rdt_last_cmd_clear() calls that were used to
clear the last_cmd_status buffer but called without holding the required
rdtgroup_mutex.

The impacted resctrl commands are writing to the cpus or cpus_list files
and creating a new monitor or control group. With stale data in the
last_cmd_status buffer the impacted resctrl commands report the stale error
on success, or append its own failure message to the stale error on
failure.

Consequently, restore the rdt_last_cmd_clear() calls after acquiring
rdtgroup_mutex.

Fixes: c8eafe1495 ("x86/resctrl: Fix potential lockdep warning")
Signed-off-by: Zeng Heng <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Reinette Chatre <[email protected]>
Link: https://lore.kernel.org/all/[email protected]

2025-06-04 20:32:55 +02:00

..

ctrlmondata.c

…

internal.h

…

Kconfig

…

Makefile

…

monitor_trace.h

…

monitor.c

…

pseudo_lock.c

…

rdtgroup.c

fs/resctrl: Restore the rdt_last_cmd_clear() calls after acquiring rdtgroup_mutex

2025-06-04 20:32:55 +02:00