From 982ea6f9ff2b2f92c03eda06df420b2f3699b7ad Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Fri, 15 Jun 2018 14:41:59 -0700 Subject: [PATCH] scsi: mpt3sas: Fix a race condition in mpt3sas_base_hard_reset_handler() Since ioc->shost_recovery is set after ioc->reset_in_progress_mutex is obtained, if concurrent resets are issued there is a short time during which ioc->reset_in_progress_mutex is locked and ioc->shost_recovery == 0. Avoid that this can cause trouble by unconditionally locking ioc->shost_recovery. Signed-off-by: Bart Van Assche Cc: Sathya Prakash Cc: Chaitra P B Cc: Suganath Prabu Subramani Signed-off-by: Martin K. Petersen --- drivers/scsi/mpt3sas/mpt3sas_base.c | 10 +--------- drivers/scsi/mpt3sas/mpt3sas_base.h | 1 - 2 files changed, 1 insertion(+), 10 deletions(-) diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 340db9ee090d..107c9b4d197b 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -6959,14 +6959,7 @@ mpt3sas_base_hard_reset_handler(struct MPT3SAS_ADAPTER *ioc, mpt3sas_halt_firmware(ioc); /* wait for an active reset in progress to complete */ - if (!mutex_trylock(&ioc->reset_in_progress_mutex)) { - do { - ssleep(1); - } while (ioc->shost_recovery == 1); - dtmprintk(ioc, pr_info(MPT3SAS_FMT "%s: exit\n", ioc->name, - __func__)); - return ioc->ioc_reset_in_progress_status; - } + mutex_lock(&ioc->reset_in_progress_mutex); spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags); ioc->shost_recovery = 1; @@ -7015,7 +7008,6 @@ mpt3sas_base_hard_reset_handler(struct MPT3SAS_ADAPTER *ioc, ioc->name, __func__, ((r == 0) ? "SUCCESS" : "FAILED"))); spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags); - ioc->ioc_reset_in_progress_status = r; ioc->shost_recovery = 0; spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags); ioc->ioc_reset_count++; diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h index 247a9e6c485c..f137c51b4623 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.h +++ b/drivers/scsi/mpt3sas/mpt3sas_base.h @@ -1166,7 +1166,6 @@ struct MPT3SAS_ADAPTER { struct mutex reset_in_progress_mutex; spinlock_t ioc_reset_in_progress_lock; u8 ioc_link_reset_in_progress; - u8 ioc_reset_in_progress_status; u8 ignore_loginfos; u8 remove_host;