Marek Vasut wrote:
Dne Ne 22. srpna 2010 13:22:40 Mike Rapoport napsal(a):
The commit 886275ce41a9751117367fb387ed171049eb6148 (param: lock
if_sdio's lbs_helper_name and lbs_fw_name against sysfs changes)
introduced new fields into the if_sdio_card structure. It caused
missalignment of the if_sdio_card.buffer field and failure at driver
load time:
~# modprobe libertas_sdio
[ 62.315124] libertas_sdio: Libertas SDIO driver
[ 62.319976] libertas_sdio: Copyright Pierre Ossman
[ 63.020629] DMA misaligned error with device 48
[ 63.025207] mmci-omap-hs mmci-omap-hs.1: unexpected dma status 800
[ 66.005035] libertas: command 0x0003 timed out
[ 66.009826] libertas: Timeout submitting command 0x0003
[ 66.016296] libertas: PREP_CMD: command 0x0003 failed: -110
Adding explicit alignment attribute for the if_sdio_card.buffer field
fixes this problem.
Signed-off-by: Mike Rapoport <mike@xxxxxxxxxxxxxx>
---
drivers/net/wireless/libertas/if_sdio.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/net/wireless/libertas/if_sdio.c
b/drivers/net/wireless/libertas/if_sdio.c index ba854c7..87b6349 100644
--- a/drivers/net/wireless/libertas/if_sdio.c
+++ b/drivers/net/wireless/libertas/if_sdio.c
@@ -128,7 +128,7 @@ struct if_sdio_card {
bool helper_allocated;
bool firmware_allocated;
- u8 buffer[65536];
+ u8 buffer[65536] __attribute__((aligned(4)));
spinlock_t lock;
struct if_sdio_packet *packets;
Will this work even on platforms that need some weird DMA destination address
alignment ? I might be totally off with this question though ;-)
I've tested it on PXA and OMAP and it works on both.
I think that on platforms with weird DMA destination address alignment
libertas_sdio will fail anyway because of if_sdio_packet alignment.
Cheers
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Sincerely yours,
Mike.
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