linux-kernel - Re: [PATCH v2 2/4] scsi: ufs: add debugfs for ufs

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Date:	Thu, 12 Feb 2015 22:53:44 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Gilad Broner <gbroner@...eaurora.org>
Cc:	Jej B <James.Bottomley@...senpartnership.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org, Santosh Y <santoshsy@...il.com>,
	linux-scsi-owner@...r.kernel.org,
	Subhash Jadavani <subhashj@...eaurora.org>,
	Yaniv Gardi <ygardi@...eaurora.org>,
	Dolev Raviv <draviv@...eaurora.org>,
	Lee Susman <lsusman@...eaurora.org>,
	Raviv Shvili <rshvili@...eaurora.org>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>
Subject: Re: [PATCH v2 2/4] scsi: ufs: add debugfs for ufs

2015-02-10 22:58 GMT+09:00 Gilad Broner <gbroner@...eaurora.org>:
> @@ -5760,6 +5963,8 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
>
>         async_schedule(ufshcd_async_scan, hba);
>
> +       UFSDBG_ADD_DEBUGFS(hba);
> +
>         return 0;
>
>  out_remove_scsi_host:
> @@ -5769,6 +5974,7 @@ exit_gating:
>  out_disable:
>         hba->is_irq_enabled = false;
>         scsi_host_put(host);
> +       UFSDBG_REMOVE_DEBUGFS(hba);
>         ufshcd_hba_exit(hba);
>  out_error:
>         return err;

UFSDBG_REMOVE_DEBUGFS() is not called in the driver unloading path.
So ufs debugfs directory is not removed when unloading driver.  It
should be called in ufshcd_remove().

BTW, do we really need UFSDBG_ADD_DEBUGFS() and UFSDBG_REMOVE_DEBUGFS()
macros?
We can use static inline functions in ufs-debugfs.h when !CONFIG_DEBUG_FS.

#ifdef CONFIG_DEBUG_FS
void ufsdbg_add_debugfs(struct ufs_hba *hba);

void ufsdbg_remove_debugfs(struct ufs_hba *hba);
#else
static inline void ufsdbg_add_debugfs(struct ufs_hba *hba)
{
}

static inline void ufsdbg_remove_debugfs(struct ufs_hba *hba)
{
}
#endif
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