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Date: Thu, 6 May 2010 13:47:17 +0100 From: Ian Abbott <abbotti@....co.uk> To: Tobias Klauser <klto@...w.ch> CC: Ian Abbott <ian.abbott@....co.uk>, "sfr@...b.auug.org.au" <sfr@...b.auug.org.au>, "gregkh@...e.de" <gregkh@...e.de>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>, "nios2-dev@...c.et.ntust.edu.tw" <nios2-dev@...c.et.ntust.edu.tw> Subject: Re: [Nios2-dev] [PATCH 2/2] serial: Add driver for the Altera UART Hi Tobias, On 06/05/10 13:03, Tobias Klauser wrote: > I also noticed, that altera_uart_break_ctl takes the lock which might be > not necessary as the caller in serial_core.c already takes port->mutex > which should be enough. Or am I wrong? It's not enough. The spin lock is needed to protect modification of pp->imr and writing this modified value to the control register. Not all paths that modify pp->imr and the control register grab port->mutex beforehand (for example, the interrupt routine doesn't and can't). -- -=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@....co.uk> )=- -=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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