linux-kernel - Re: [PATCH] drivers/scsi/mca_53c9x.c : save

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Message-Id: <1162963585.22062.173.camel@amol.verismonetworks.com>
Date:	Wed, 08 Nov 2006 10:56:25 +0530
From:	Amol Lad <amol@...ismonetworks.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Andrew Morton <akpm@...l.org>, James.Bottomley@...eleye.com,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/scsi/mca_53c9x.c : save_flags()/cli() removal

On Tue, 2006-11-07 at 22:29 +0000, Christoph Hellwig wrote:
> On Mon, Nov 06, 2006 at 06:12:11PM +0530, Amol Lad wrote:
> > Replaced save_flags()/cli() with spin_lock alternatives
> 
> This patch has very little chance to work as-is because it only replaces
> cli with spinlocks, but not the irq handler it's locking against.
> 
It protects against irq handler also. 

drivers/scsi/NCR53C9x.c:

irqreturn_t esp_intr(int irq, void *dev_id)
{
    struct NCR_ESP *esp;
    unsigned long flags;
    int again;
    struct Scsi_Host *dev = dev_id;

    /* Handle all ESP interrupts showing at this IRQ level. */
    spin_lock_irqsave(dev->host_lock, flags);
...
...
}


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