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authorSreekanth Reddy <sreekanth.reddy@avagotech.com>2015-11-11 17:30:33 +0530
committerMartin K. Petersen <martin.petersen@oracle.com>2015-11-11 19:24:02 -0500
commit08c4d550c5797d842b1f1bb85d474a8b54f02382 (patch)
tree188c3590ac007bbdbcfe83c9c4e93f31600fe463 /drivers/scsi/mpt3sas/mpt3sas_scsih.c
parent989e43c7ec3401f95e40a792367995e4d4fc5b66 (diff)
mpt3sas: setpci reset kernel oops fix
setpci reset on nytro warpdrive card along with sysfs access and cli ioctl access resulted in kernel oops 1. pci_access_mutex lock added to provide synchronization between IOCTL, sysfs, PCI resource handling path 2. gioc_lock spinlock to protect list operations over multiple controllers This patch is ported from commit 6229b414b3ad ("mpt2sas: setpci reset kernel oops fix"). Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com> Acked-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/mpt3sas/mpt3sas_scsih.c')
-rw-r--r--drivers/scsi/mpt3sas/mpt3sas_scsih.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index 436e65e513ae..d0ab0028c2eb 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -90,6 +90,8 @@ _scsih_setup_direct_io(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
/* global parameters */
LIST_HEAD(mpt3sas_ioc_list);
char driver_name[MPT_NAME_LENGTH];
+/* global ioc lock for list operations */
+DEFINE_SPINLOCK(gioc_lock);
/* local parameters */
static u8 scsi_io_cb_idx = -1;
@@ -294,8 +296,10 @@ _scsih_set_debug_level(const char *val, struct kernel_param *kp)
return ret;
pr_info("setting logging_level(0x%08x)\n", logging_level);
+ spin_lock(&gioc_lock);
list_for_each_entry(ioc, &mpt3sas_ioc_list, list)
ioc->logging_level = logging_level;
+ spin_unlock(&gioc_lock);
return 0;
}
module_param_call(logging_level, _scsih_set_debug_level, param_get_int,
@@ -7997,7 +8001,9 @@ void scsih_remove(struct pci_dev *pdev)
sas_remove_host(shost);
scsi_remove_host(shost);
mpt3sas_base_detach(ioc);
+ spin_lock(&gioc_lock);
list_del(&ioc->list);
+ spin_unlock(&gioc_lock);
scsi_host_put(shost);
}
@@ -8384,7 +8390,9 @@ scsih_probe(struct pci_dev *pdev, struct Scsi_Host *shost)
ioc = shost_priv(shost);
memset(ioc, 0, sizeof(struct MPT3SAS_ADAPTER));
INIT_LIST_HEAD(&ioc->list);
+ spin_lock(&gioc_lock);
list_add_tail(&ioc->list, &mpt3sas_ioc_list);
+ spin_unlock(&gioc_lock);
ioc->shost = shost;
ioc->id = mpt_ids++;
ioc->pdev = pdev;
@@ -8403,6 +8411,8 @@ scsih_probe(struct pci_dev *pdev, struct Scsi_Host *shost)
ioc->schedule_dead_ioc_flush_running_cmds = &_scsih_flush_running_cmds;
/* misc semaphores and spin locks */
mutex_init(&ioc->reset_in_progress_mutex);
+ /* initializing pci_access_mutex lock */
+ mutex_init(&ioc->pci_access_mutex);
spin_lock_init(&ioc->ioc_reset_in_progress_lock);
spin_lock_init(&ioc->scsi_lookup_lock);
spin_lock_init(&ioc->sas_device_lock);
@@ -8510,7 +8520,9 @@ out_add_shost_fail:
out_attach_fail:
destroy_workqueue(ioc->firmware_event_thread);
out_thread_fail:
+ spin_lock(&gioc_lock);
list_del(&ioc->list);
+ spin_unlock(&gioc_lock);
scsi_host_put(shost);
return rv;
}

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