linux-kernel - Re: [PATCH v7] staging: unisys: visorhba: Convert module from IDR to XArray

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Message-ID: <20210504134606.GR21598@kadam>
Date:   Tue, 4 May 2021 16:46:06 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     outreachy-kernel@...glegroups.com,
        David Kershner <david.kershner@...sys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        sparmaintainer@...sys.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v7] staging: unisys: visorhba: Convert module from IDR to
 XArray

On Tue, May 04, 2021 at 03:32:53PM +0200, Fabio M. De Francesco wrote:
> +static int setup_scsitaskmgmt_handles(struct xarray *xa, struct uiscmdrsp *cmdrsp,
>  				       wait_queue_head_t *event, int *result)
>  {
> -	/* specify the event that has to be triggered when this */
> -	/* cmd is complete */
> -	cmdrsp->scsitaskmgmt.notify_handle =
> -		simple_idr_get(idrtable, event, lock);
> -	cmdrsp->scsitaskmgmt.notifyresult_handle =
> -		simple_idr_get(idrtable, result, lock);
> +	int ret;
> +	u32 id;
> +
> +	/* specify the event that has to be triggered when this cmd is complete */
> +	ret = xa_alloc_irq(xa, &id, event, xa_limit_32b, GFP_KERNEL);
> +	if (ret) 
> +		return ret;
> +	else
> +		cmdrsp->scsitaskmgmt.notify_handle = id;
> +	ret = xa_alloc_irq(xa, &id, result, xa_limit_32b, GFP_KERNEL);
> +	if (ret) {
> +		xa_erase_irq(xa, cmdrsp->scsitaskmgmt.notify_handle);
> +		return ret;
> +	} else
> +		cmdrsp->scsitaskmgmt.notifyresult_handle = id;

This else statement is not required.  Please use the checkpatch script.

	if (ret) {
		xa_erase_irq(xa, cmdrsp->scsitaskmgmt.notify_handle);
		return ret;
	}
	cmdrsp->scsitaskmgmt.notifyresult_handle = id;


> +
> +	return 0;
>  }
>  

[ snip ]

> @@ -1096,7 +1080,7 @@ static void visorhba_remove(struct visor_device *dev)
>  	scsi_remove_host(scsihost);
>  	scsi_host_put(scsihost);
>  
> -	idr_destroy(&devdata->idr);
> +	xa_destroy(&devdata->xa);

Don't add this.  Matthew explained this earlier.

>  
>  	dev_set_drvdata(&dev->device, NULL);
>  	debugfs_remove(devdata->debugfs_info);

regards,
dan carpenter