linux-kernel - Re: + zram-rework-reset-and-destroy-path-fix.patch added to -mm tree

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Date:	Thu, 5 Feb 2015 09:36:46 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org, jmarchan@...hat.com,
	minchan@...nel.org, ngupta@...are.org, opensource.ganesh@...il.com,
	sergey.senozhatsky@...il.com, mm-commits@...r.kernel.org
Subject: Re: + zram-rework-reset-and-destroy-path-fix.patch added to -mm tree

On (02/04/15 14:29), Andrew Morton wrote:
> which yields
> 

/* not sure if my previous email has been delived, seems there are some
connectivity problems on my side */


we need to unregister_blkdev(), 'out' label does not do it.

how about the following one (looks simple):

> static int __init zram_init(void)
> {
> 	int ret;
> 	int dev_id;
> 
> 	if (num_devices > max_num_devices) {
> 		pr_warn("Invalid value for num_devices: %u\n",
> 				num_devices);
> 		return -EINVAL;
> 	}
> 
> 	zram_major = register_blkdev(0, "zram");
> 	if (zram_major <= 0) {
> 		pr_warn("Unable to get major number\n");
> 		return -EBUSY;
> 	}
> 
> 	/* Allocate the device array and initialize each one */
> 	zram_devices = kzalloc(num_devices * sizeof(struct zram), GFP_KERNEL);
> 	if (!zram_devices) {
-               ret = -ENOMEM;
-               goto out_error;
+               unregister_blkdev(zram_major, "zram");
+               return -ENOMEM;
> 	}
> 
> 	for (dev_id = 0; dev_id < num_devices; dev_id++) {
> 		ret = create_device(&zram_devices[dev_id], dev_id);
> 		if (ret)
> 			goto out_devices;
> 	}
> 
> 	pr_info("Created %u device(s)\n", num_devices);
> 	return 0;
> 
> out_devices:
> 	destroy_devices(dev_id);
- out:
> 	return ret;
> }
--
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