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Date: Sun, 21 Jul 2002 23:09:34 +0200 (CEST)
From: Ingo Molnar <mingo@elte.hu>
Reply-To: Ingo Molnar <mingo@elte.hu>
To: Russell King <rmk@arm.linux.org.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [patch] "big IRQ lock" removal, 2.5.27-A1
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using serial-2.5.26-3.diff, i get an oops here:

(gdb) list *0xc01b1f03
0xc01b1f03 is in serial_in (serial_8250.c:189).
184                     return readb(up->port.membase + offset);
185
186             default:
187                     return inb(up->port.iobase + offset);
188             }
189     }
190
191     static _INLINE_ void
192     serial_out(struct uart_8250_port *up, int offset, int value)
193     {
(gdb)

called from:

(gdb) list *0xc01b3450
0xc01b3450 is in serial8250_interrupt (serial_8250.c:946).
941                     struct uart_8250_port *up;
942                     unsigned int iir;
943
944                     up = list_entry(l, struct uart_8250_port, list);
945
946                     iir = serial_in(up, UART_IIR);
947                     if (!(iir & UART_IIR_NO_INT)) {
948                             spin_lock(&up->port.lock);
949                             serial8250_handle_port(up, regs);
950                             spin_unlock(&up->port.lock);
(gdb)

when echo-ing into a serial port, which is also set up for kernel serial
console. (the kernel serial console produces no output.)

	Ingo

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