linux-kernel - Re: [PATCH 4/4] virtio-blk: remove deprecated ida_simple

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Date:   Fri, 27 May 2022 10:04:46 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     kch@...dia.com
Cc:     jasowang@...hat.com, linux-block@...r.kernel.org, mst@...hat.com,
        pbonzini@...hat.com, stefanha@...hat.com,
        virtualization@...ts.linux-foundation.org,
        keliu <liuke94@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] virtio-blk: remove deprecated ida_simple_XXX()

(Resend, my email client sent it as HTML. So sorry for the duplicate)


Hi,

 > diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
 > index 74c3a48cd1e5..e05748337dd1 100644
 > --- a/drivers/block/virtio_blk.c
 > +++ b/drivers/block/virtio_blk.c
 > @@ -720,8 +720,8 @@ static int virtblk_probe(struct virtio_device *vdev)
 > 		return -EINVAL;
 > 	}
 >
 >-	err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
 >-			     GFP_KERNEL);
 >+	err = ida_alloc_max(&vd_index_ida, minor_to_index(1 << MINORBITS),
 >+			    GFP_KERNEL);
 > 	if (err < 0)
 > 		goto out;
 > 	index = err;


this patch, already applied to -next, is wrong.


The upper bound of ida_simple_get() is exlcusive, while the one of 
ida_alloc_max() is inclusive.

So, 'minor_to_index(1 << MINORBITS)' should be 'minor_to_index(1 << 
MINORBITS) - 1' here.


(adding keliu in cc: because he is proposing the same kind of patches, 
so he will see how to to these changes that are slighly tricky)


CJ