From ae94922342b35ee7939add3062f441909e82946a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sat, 23 Mar 2019 16:52:13 +0800 Subject: [PATCH] nfit/ars: Introduce scrub_flags mainline inclusion from mainline-5.1-rc1 commit c6c5df293bf1 category: bugfix bugzilla: 12593 CVE: NA ------------------------------------------------- In preparation for introducing new flags to gate whether ARS results are stale, or poll the completion state, convert the existing flags to an unsigned long with enumerated values. This conversion allows the flags to be atomically updated outside of ->init_mutex. Reviewed-by: Toshi Kani Signed-off-by: Dan Williams Signed-off-by: Xiongfeng Wang Reviewed-by: Hanjun Guo Signed-off-by: Yang Yingliang --- drivers/acpi/nfit/core.c | 30 +++++++++++++++++------------- drivers/acpi/nfit/nfit.h | 8 ++++++-- 2 files changed, 23 insertions(+), 15 deletions(-) diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index b5237a506464..6b5a3c3b4458 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -1298,19 +1298,23 @@ static ssize_t scrub_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nvdimm_bus_descriptor *nd_desc; + struct acpi_nfit_desc *acpi_desc; ssize_t rc = -ENXIO; + bool busy; device_lock(dev); nd_desc = dev_get_drvdata(dev); - if (nd_desc) { - struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc); - - mutex_lock(&acpi_desc->init_mutex); - rc = sprintf(buf, "%d%s", acpi_desc->scrub_count, - acpi_desc->scrub_busy - && !acpi_desc->cancel ? "+\n" : "\n"); - mutex_unlock(&acpi_desc->init_mutex); + if (!nd_desc) { + device_unlock(dev); + return rc; } + acpi_desc = to_acpi_desc(nd_desc); + + mutex_lock(&acpi_desc->init_mutex); + busy = test_bit(ARS_BUSY, &acpi_desc->scrub_flags) + && !test_bit(ARS_CANCEL, &acpi_desc->scrub_flags); + rc = sprintf(buf, "%d%s", acpi_desc->scrub_count, busy ? "+\n" : "\n"); + mutex_unlock(&acpi_desc->init_mutex); device_unlock(dev); return rc; } @@ -2960,7 +2964,7 @@ static unsigned int __acpi_nfit_scrub(struct acpi_nfit_desc *acpi_desc, lockdep_assert_held(&acpi_desc->init_mutex); - if (acpi_desc->cancel) + if (test_bit(ARS_CANCEL, &acpi_desc->scrub_flags)) return 0; if (query_rc == -EBUSY) { @@ -3034,7 +3038,7 @@ static void __sched_ars(struct acpi_nfit_desc *acpi_desc, unsigned int tmo) { lockdep_assert_held(&acpi_desc->init_mutex); - acpi_desc->scrub_busy = 1; + set_bit(ARS_BUSY, &acpi_desc->scrub_flags); /* note this should only be set from within the workqueue */ if (tmo) acpi_desc->scrub_tmo = tmo; @@ -3050,7 +3054,7 @@ static void notify_ars_done(struct acpi_nfit_desc *acpi_desc) { lockdep_assert_held(&acpi_desc->init_mutex); - acpi_desc->scrub_busy = 0; + clear_bit(ARS_BUSY, &acpi_desc->scrub_flags); acpi_desc->scrub_count++; if (acpi_desc->scrub_count_state) sysfs_notify_dirent(acpi_desc->scrub_count_state); @@ -3322,7 +3326,7 @@ int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc, struct nfit_spa *nfit_spa; mutex_lock(&acpi_desc->init_mutex); - if (acpi_desc->cancel) { + if (test_bit(ARS_CANCEL, &acpi_desc->scrub_flags)) { mutex_unlock(&acpi_desc->init_mutex); return 0; } @@ -3401,7 +3405,7 @@ void acpi_nfit_shutdown(void *data) mutex_unlock(&acpi_desc_lock); mutex_lock(&acpi_desc->init_mutex); - acpi_desc->cancel = 1; + set_bit(ARS_CANCEL, &acpi_desc->scrub_flags); cancel_delayed_work_sync(&acpi_desc->dwork); mutex_unlock(&acpi_desc->init_mutex); diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h index df31a2721573..94710e579598 100644 --- a/drivers/acpi/nfit/nfit.h +++ b/drivers/acpi/nfit/nfit.h @@ -181,6 +181,11 @@ struct nfit_mem { bool has_lsw; }; +enum scrub_flags { + ARS_BUSY, + ARS_CANCEL, +}; + struct acpi_nfit_desc { struct nvdimm_bus_descriptor nd_desc; struct acpi_table_header acpi_header; @@ -202,8 +207,7 @@ struct acpi_nfit_desc { unsigned int max_ars; unsigned int scrub_count; unsigned int scrub_mode; - unsigned int scrub_busy:1; - unsigned int cancel:1; + unsigned long scrub_flags; unsigned long dimm_cmd_force_en; unsigned long bus_cmd_force_en; unsigned long bus_nfit_cmd_force_en; -- GitLab