linux-kernel - Re: [patch] HWBKPT FIX: Release the bp slot if arch_validate_hwbkpt

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Date:	Thu, 21 Jan 2010 14:12:47 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	prasad@...ux.vnet.ibm.com, maneesh@...ibm.com
Subject: Re: [patch] HWBKPT FIX: Release the bp slot if
	arch_validate_hwbkpt_settings() fails.

On Thu, Jan 21, 2010 at 06:25:16PM +0530, Mahesh Salgaonkar wrote:
> 
> On a given architecture, when hardware breakpoint registration fails due
> to un-supported access type (read/write/execute), we loose the bp slot since
> register_perf_hw_breakpoint() does not release the bp slot on failure.
> Hence, any subsequent hardware breakpoint registration starts failing
> with 'no space left on device' error.
> 
> This patch introduces error handling in register_perf_hw_breakpoint()
> function and releases bp slot on error.
> 
> Signed-off-by: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>


Thanks. I'm queuing it.

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