Messages in this thread | | | Date | Mon, 27 Mar 2023 14:26:48 -0700 | Subject | Re: [PATCH 1/5] scsi: fix switch host state race between by sysfs and others | From | Bart Van Assche <> |
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On 3/24/23 18:17, Ye Bin wrote: > From: Ye Bin <yebin10@huawei.com> > > Now, switch host state by sysfs isn't hold 'shost->host_lock' lock. > It may race with other process, lead to host mixed state. > > Signed-off-by: Ye Bin <yebin10@huawei.com> > --- > drivers/scsi/scsi_sysfs.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c > index ee28f73af4d4..cc0ae5e3def3 100644 > --- a/drivers/scsi/scsi_sysfs.c > +++ b/drivers/scsi/scsi_sysfs.c > @@ -202,6 +202,7 @@ store_shost_state(struct device *dev, struct device_attribute *attr, > int i; > struct Scsi_Host *shost = class_to_shost(dev); > enum scsi_host_state state = 0; > + unsigned long flags; > > for (i = 0; i < ARRAY_SIZE(shost_states); i++) { > const int len = strlen(shost_states[i].name); > @@ -214,8 +215,13 @@ store_shost_state(struct device *dev, struct device_attribute *attr, > if (!state) > return -EINVAL; > > - if (scsi_host_set_state(shost, state)) > + spin_lock_irqsave(shost->host_lock, flags); > + if (scsi_host_set_state(shost, state)) { > + spin_unlock_irqrestore(shost->host_lock, flags); > return -EINVAL; > + } > + spin_unlock_irqrestore(shost->host_lock, flags); > + > return count; > }
Please make sure that there is only one spin_unlock_irqrestore() call in this function.
Thanks,
Bart.
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