Re: [PATCH 2/3] Stop accepting SCSI requests before removing a device

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


On 05/04/2012 10:06 AM, Bart Van Assche wrote:
> diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
> index 42c35ff..f8fc240 100644
> --- a/drivers/scsi/scsi_sysfs.c
> +++ b/drivers/scsi/scsi_sysfs.c
> @@ -955,12 +955,20 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
>  void __scsi_remove_device(struct scsi_device *sdev)
>  {
>  	struct device *dev = &sdev->sdev_gendev;
> +	struct request_queue *q = sdev->request_queue;
> +
> +	/*
> +	 * Stop accepting new requests before tearing down the
> +	 * device. Note: the actual queue deallocation happens in
> +	 * scsi_device_dev_release_usercontext().
> +	 */
> +	blk_cleanup_queue(q);
>  
>  	if (sdev->is_visible) {
>  		if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
>  			return;
>  
> -		bsg_unregister_queue(sdev->request_queue);
> +		bsg_unregister_queue(q);
>  		device_unregister(&sdev->sdev_dev);
>  		transport_remove_device(dev);
>  		device_del(dev);
> @@ -971,8 +979,6 @@ void __scsi_remove_device(struct scsi_device *sdev)

My fault. The blk_cleanup_queue call should be right before the
scsi_device_set_state(sdev, SDEV_DEL); call in this function.

It needs to be after the device_del call, because that triggers the SCSI
ULD removal which can send IO.


>  		sdev->host->hostt->slave_destroy(sdev);
>  	transport_destroy_device(dev);
>  
> -	/* Freeing the queue signals to block that we're done */
> -	blk_cleanup_queue(sdev->request_queue);
>  	put_device(dev);
>  }
>  
> --
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Kernel Newbies]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Photos]     [Yosemite]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Linux IIO]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

Add to Google Powered by Linux