+ Balaji,
On Friday 26 August 2011 09:49 PM, Russell King - ARM Linux wrote:
I'm not sure who's responsible for this, but the nonblocking MMC stuff is broken on OMAPs HSMMC:
mmcblk0: error -84 transferring data, sector 149201, nr 64, cmd response 0x900, card status 0xb00 mmcblk0: retrying using single block read ------------[ cut here ]------------ WARNING: at /home/rmk/git/linux-2.6-rmk/lib/dma-debug.c:811 check_unmap+0x1ac/0x764() omap_hsmmc omap_hsmmc.0: DMA-API: device driver tries to free DMA memory it has not allocated [device address=0x0000000080933000] [size=20480 bytes] Modules linked in: Backtrace: [<c0017874>] (dump_backtrace+0x0/0x10c) from [<c02ce8ac>] (dump_stack+0x18/0x1c) r7:c1abfcb8 r6:c0186248 r5:c037de51 r4:0000032b [<c02ce894>] (dump_stack+0x0/0x1c) from [<c0039ed4>] (warn_slowpath_common+0x58/0x70) [<c0039e7c>] (warn_slowpath_common+0x0/0x70) from [<c0039f90>] (warn_slowpath_fmt+0x38/0x40) r8:c1abfd50 r7:00000000 r6:00005000 r5:00000000 r4:80933000 [<c0039f58>] (warn_slowpath_fmt+0x0/0x40) from [<c0186248>] (check_unmap+0x1ac/0x764) r3:c0367d55 r2:c037e24d [<c018609c>] (check_unmap+0x0/0x764) from [<c0186978>] (debug_dma_unmap_sg+0x100/0x134) [<c0186878>] (debug_dma_unmap_sg+0x0/0x134) from [<c0019770>] (dma_unmap_sg+0x24/0x7c) [<c001974c>] (dma_unmap_sg+0x0/0x7c) from [<c0207220>] (omap_hsmmc_post_req+0x48/0x54) [<c02071d8>] (omap_hsmmc_post_req+0x0/0x54) from [<c01fb644>] (mmc_start_req+0x9c/0x128) r4:c1a76000 [<c01fb5a8>] (mmc_start_req+0x0/0x128) from [<c02049fc>] (mmc_blk_issue_rw_rq+0x80/0x460) r8:c1ab5c00 r7:00000001 r6:c1ab5824 r5:c1ab5824 r4:c1ab5c00 [<c020497c>] (mmc_blk_issue_rw_rq+0x0/0x460) from [<c02050a8>] (mmc_blk_issue_rq+0x2cc/0x2fc) [<c0204ddc>] (mmc_blk_issue_rq+0x0/0x2fc) from [<c02056c4>] (mmc_queue_thread+0xa0/0x104) [<c0205624>] (mmc_queue_thread+0x0/0x104) from [<c0054f8c>] (kthread+0x88/0x90) [<c0054f04>] (kthread+0x0/0x90) from [<c003d9a4>] (do_exit+0x0/0x618) r7:00000013 r6:c003d9a4 r5:c0054f04 r4:c1a7bc7c ---[ end trace 3314ad56daf5d14f ]---
Luckily thinks continue to work, but clearly releasing DMA mappings which drivers don't own is bad news. Unfortunately, I don't have the bandwidth to be able to investigate this at present - well, I could do but then I'd have to drop working on the OMAP4 vs generic suspend/resume code and learn about something I've no current clue about.
Please continue your help on generic suspend.
Can someone please investigate and fix whatever is broken.
Will find somebody to look at this issue.
Regards Santosh