Re: [PATCH V5 08/10] aacraid: Fix AIF triggered IOP_RESET

[Tomas Henzl <thenzl@redhat.com>]

On 3.2.2016 01:58, Raghava Aditya Renukunta wrote:
> From: Raghava Aditya Renukunta <raghavaaditya.renukunta@pmcs.com>
>
> while driver removal is in progress or PCI shutdown is invoked, driver
> kills AIF aacraid thread, but IOCTL requests from the management tools
> re-start AIF thread leading to IOP_RESET.
>
> Fixed by setting adapter_shutdown flag when PCI shutdown is invoked.
>
> Changes in V2:
> Set adapter_shutdown flag before shutdown command is sent to \
> controller
>
> Changes in V3:
> Call aac_send_shut_shutdown first thing in __aac_shutdown
> Convert adapter_shutdown to atomic_t variable to prevent \
> SMP coherency issues(race conditions)
>
> Changes in V4:
> Used mutex to protect ioctl path and adapter_shutdown to prevent \
> race conditions.
>
> Changes in V5:
> Moved replacement of aac_mutex with ioctl_mutex to previous patch
>
> Signed-off-by: Raghava Aditya Renukunta <raghavaaditya.renukunta@pmcs.com>
> Reviewed-by: Shane Seymour <shane.seymour@hpe.com>
> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
> Reviewed-by: Tomas Henzl <thenzl@redhat.com>
> ---
>  drivers/scsi/aacraid/commctrl.c | 3 +++
>  drivers/scsi/aacraid/comminit.c | 6 ++++--
>  drivers/scsi/aacraid/linit.c    | 5 +++--
>  3 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
> index 4d5f4e7..f6692d1 100644
> --- a/drivers/scsi/aacraid/commctrl.c
> +++ b/drivers/scsi/aacraid/commctrl.c
> @@ -857,6 +857,9 @@ int aac_do_ioctl(struct aac_dev * dev, int cmd, void __user *arg)
>  
>  	mutex_lock(&dev->ioctl_mutex);
>  
> +	if (dev->adapter_shutdown)
> +		return -EACCES;

and here too - mutex_unlock please

-tm

> +
>  	/*
>  	 *	HBA gets first crack
>  	 */
> diff --git a/drivers/scsi/aacraid/comminit.c b/drivers/scsi/aacraid/comminit.c
> index 0e954e3..2b4e753 100644
> --- a/drivers/scsi/aacraid/comminit.c
> +++ b/drivers/scsi/aacraid/comminit.c
> @@ -212,8 +212,11 @@ int aac_send_shutdown(struct aac_dev * dev)
>  		return -ENOMEM;
>  	aac_fib_init(fibctx);
>  
> -	cmd = (struct aac_close *) fib_data(fibctx);
> +	mutex_lock(&dev->ioctl_mutex);
> +	dev->adapter_shutdown = 1;
> +	mutex_unlock(&dev->ioctl_mutex);
>  
> +	cmd = (struct aac_close *) fib_data(fibctx);
>  	cmd->command = cpu_to_le32(VM_CloseAll);
>  	cmd->cid = cpu_to_le32(0xfffffffe);
>  
> @@ -229,7 +232,6 @@ int aac_send_shutdown(struct aac_dev * dev)
>  	/* FIB should be freed only after getting the response from the F/W */
>  	if (status != -ERESTARTSYS)
>  		aac_fib_free(fibctx);
> -	dev->adapter_shutdown = 1;
>  	if ((dev->pdev->device == PMC_DEVICE_S7 ||
>  	     dev->pdev->device == PMC_DEVICE_S8 ||
>  	     dev->pdev->device == PMC_DEVICE_S9) &&
> diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
> index 5f08bcf..2c7405a 100644
> --- a/drivers/scsi/aacraid/linit.c
> +++ b/drivers/scsi/aacraid/linit.c
> @@ -703,7 +703,7 @@ static int aac_cfg_open(struct inode *inode, struct file *file)
>  static long aac_cfg_ioctl(struct file *file,
>  		unsigned int cmd, unsigned long arg)
>  {
> -	if (!capable(CAP_SYS_RAWIO) || aac->adapter_shutdown)
> +	if (!capable(CAP_SYS_RAWIO))
>  		return -EPERM;
>  	return aac_do_ioctl(file->private_data, cmd, (void __user *)arg);
>  }
> @@ -1069,6 +1069,8 @@ static void __aac_shutdown(struct aac_dev * aac)
>  	int i;
>  	int cpu;
>  
> +	aac_send_shutdown(aac);
> +
>  	if (aac->aif_thread) {
>  		int i;
>  		/* Clear out events first */
> @@ -1080,7 +1082,6 @@ static void __aac_shutdown(struct aac_dev * aac)
>  		}
>  		kthread_stop(aac->thread);
>  	}
> -	aac_send_shutdown(aac);
>  	aac_adapter_disable_int(aac);
>  	cpu = cpumask_first(cpu_online_mask);
>  	if (aac->pdev->device == PMC_DEVICE_S6 ||