Re: [tip:bkl/drivers] drivers: Remove BKL from misc_open

[Alan Cox]

On Wed, 14 Oct 2009 15:47:39 GMT
tip-bot for Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:

> Commit-ID:  40b798efe3460797a4ac928ee2e038774e2758eb
> Gitweb:     http://git.kernel.org/tip/40b798efe3460797a4ac928ee2e038774e2758eb
> Author:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> AuthorDate: Sat, 10 Oct 2009 15:35:43 +0000
> Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> CommitDate: Wed, 14 Oct 2009 17:33:32 +0200
> 
> drivers: Remove BKL from misc_open
> 
> misc_open() is already serialized with misc_mtx. Remove the BKL
> locking which got there via the BKL pushdown.

NAK.

You can't simply assume the mutex is enough - you have to either push it
down or review *every* possible called point below the lock_kernel take.

In this case the open method of the misc devices below sometimes uses the
BKL.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/