linux-kernel - IrDA driver fails on PXA255

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Message-ID: <20110528205701.GA1788@doriath.ww600.siemens.net>
Date:	Sun, 29 May 2011 00:57:01 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Eric Miao <eric.y.miao@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Samuel Ortiz <samuel@...tiz.org>
Subject: IrDA driver fails on PXA255

Hello,

Since a197b59ae6e8bee56fcef37ea2482dc08414e2ac (mm: fail GFP_DMA
allocations when ZONE_DMA is not configured), pxaficp_ir.c driver fails
to probe: pxa_irda_init_iobuf asks for a buffer with GFP_KERNEL |
GFP_DMA flags, which fail nicely with the following trace:

------------[ cut here ]------------
WARNING: at mm/page_alloc.c:2251
__alloc_pages_nodemask+0xa0/0x5ac()
Modules linked in:
[<c00385b0>] (unwind_backtrace+0x0/0xf0) from [<c0050b1c>] (warn_slowpath_common+0x4c/0x64)
[<c0050b1c>] (warn_slowpath_common+0x4c/0x64) from [<c0050b4c>] (warn_slowpath_null+0x18/0x1c)
[<c0050b4c>] (warn_slowpath_null+0x18/0x1c) from [<c00908ec>] (__alloc_pages_nodemask+0xa0/0x5ac)
[<c00908ec>] (__alloc_pages_nodemask+0xa0/0x5ac) from [<c0090e74>] (__get_free_pages+0x10/0x3c)
[<c0090e74>] (__get_free_pages+0x10/0x3c) from [<c01d608c>] (pxa_irda_init_iobuf+0x18/0x48)
[<c01d608c>] (pxa_irda_init_iobuf+0x18/0x48) from [<c01d61d8>] (pxa_irda_probe+0x11c/0x32c)
[<c01d61d8>] (pxa_irda_probe+0x11c/0x32c) from [<c019474c>] (platform_drv_probe+0x14/0x18)
[<c019474c>] (platform_drv_probe+0x14/0x18) from [<c0193508>] (really_probe+0xa0/0x158)
[<c0193508>] (really_probe+0xa0/0x158) from [<c019360c>] (driver_probe_device+0x4c/0x64)
[<c019360c>] (driver_probe_device+0x4c/0x64) from [<c0193684>] (__driver_attach+0x60/0x84)
[<c0193684>] (__driver_attach+0x60/0x84) from [<c0192d78>] (bus_for_each_dev+0x48/0x84)
[<c0192d78>] (bus_for_each_dev+0x48/0x84) from [<c01926b8>] (bus_add_driver+0xa8/0x220)
[<c01926b8>] (bus_add_driver+0xa8/0x220) from [<c0193c7c>] (driver_register+0xac/0x13c)
[<c0193c7c>] (driver_register+0xac/0x13c) from [<c0033440>] (do_one_initcall+0x94/0x16c)
[<c0033440>] (do_one_initcall+0x94/0x16c) from [<c00083f4>] (kernel_init+0x94/0x140)
[<c00083f4>] (kernel_init+0x94/0x140) from [<c00348d0>] (kernel_thread_exit+0x0/0x8)
---[ end trace 0b8bf08f70147098 ]---

And then I get:

pxa2xx-ir: probe of pxa2xx-ir failed with error -12

Of course one can ask for a buffer w/o GFP_DMA (see attachment), but I
ain't sure that it's correct.

-- 
With best wishes
Dmitry


View attachment "0001-pxa-don-t-ask-for-a-buffer-from-DMA-zone.patch" of type "text/x-diff" (2694 bytes)