Le samedi 13 mars 2010 23:27:49, Ithamar R. Adema a écrit :
> This fixes the following BUG:
>
> BUG: sleeping function called from invalid context at mm/slab.c:3055
> in_atomic(): 0, irqs_disabled(): 1, pid: 253, name: dd
> 1 lock held by dd/253:
> #0: (&state->mutex){......}, at: [<80148294>] uart_open+0x7c/0x448
> Call Trace:
> [<8000a1ac>] dump_stack+0x8/0x34
> [<8008a72c>] kmem_cache_alloc+0x44/0x1c4
> [<8005aaac>] request_threaded_irq+0xac/0x170
> [<801495e4>] ifxmipsasc_startup+0xb8/0x1c0
> [<801474c0>] uart_startup+0x8c/0x1c0
> [<8014836c>] uart_open+0x154/0x448
> [<8013d06c>] tty_open+0x324/0x484
> [<800918d8>] chrdev_open+0x180/0x1ec
> [<8008bc48>] __dentry_open+0x1d8/0x370
> [<8008becc>] nameidata_to_filp+0x3c/0x60
> [<8009b808>] do_filp_open+0x418/0x8a0
> [<8008b9e8>] do_sys_open+0x6c/0xc8
> [<80004104>] stack_done+0x20/0x3c
>
> Signed-off-by: Ithamar R. Adema <ithamar.ad...@team-embedded.nl>
> ---
> .../linux/ifxmips/patches-2.6.30/120-serial.patch | 7 +------
> 1 files changed, 1 insertions(+), 6 deletions(-)
>
> diff --git a/target/linux/ifxmips/patches-2.6.30/120-serial.patch
> b/target/linux/ifxmips/patches-2.6.30/120-serial.patch index
> 8aa9dbb..f91a073 100644
> --- a/target/linux/ifxmips/patches-2.6.30/120-serial.patch
> +++ b/target/linux/ifxmips/patches-2.6.30/120-serial.patch
> @@ -30,7 +30,7 @@ Index: linux-2.6.30.8/drivers/serial/ifxmips_asc.c
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6.30.8/drivers/serial/ifxmips_asc.c 2009-10-19
> 21:41:27.000000000 +0200 -@@ -0,0 +1,561 @@
> +@@ -0,0 +1,556 @@
> +/*
> + * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
> + *
> @@ -258,7 +258,6 @@ Index: linux-2.6.30.8/drivers/serial/ifxmips_asc.c
> +
> +static int ifxmipsasc_startup(struct uart_port *port)
> +{
> -+ unsigned long flags;
> + int retval;
> +
> + port->uartclk = ifxmips_get_fpi_hz();
> @@ -271,8 +270,6 @@ Index: linux-2.6.30.8/drivers/serial/ifxmips_asc.c
> + wmb();
> + ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) |
> ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN, port->membase +
> IFXMIPS_ASC_CON); +
> -+ local_irq_save(flags);
> -+
> + retval = request_irq(port->irq, ifxmipsasc_tx_int, IRQF_DISABLED,
> "asc_tx", port); + if (retval) {
> + printk(KERN_ERR "failed to request ifxmipsasc_tx_int\n");
> @@ -293,14 +290,12 @@ Index: linux-2.6.30.8/drivers/serial/ifxmips_asc.c
> +
> + ifxmips_w32(ASC_IRNREN_RX_BUF | ASC_IRNREN_TX_BUF | ASC_IRNREN_ERR |
> ASC_IRNREN_TX, port->membase + IFXMIPS_ASC_IRNREN); +
> -+ local_irq_restore(flags);
> + return 0;
> +
> +err2:
> + free_irq(port->irq + 2, port);
> +err1:
> + free_irq(port->irq, port);
> -+ local_irq_restore(flags);
> + return retval;
> +}
> +
>
Applied in r20273, thanks!
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