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    SubjectRe: linux-next-20090225: ide-cd triggers BUG at arch/x86/mm/ioremap.c:80!
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    Hi,

    > Borislav Petkov wrote:
    >> Can you also apply the following patch and send us the output?
    > I applied the patch after "git bisect reset" since I couldn't apply from this
    > state.
    >
    > [    3.419143] ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    > [    3.424508] ide_generic: please use "probe_mask=0x3f" module parameter for probing all legacy ISA IDE ports
    > [    3.429658] ide-gd driver 1.18
    > [    3.433879] ide-cd driver 5.00
    > [    3.440135] mapping rq to sg: dev hda: type=a, flags=82640
    > [    3.441873]   sector 4294967295, nr/cnr 0/0
    > [    3.445288]   bio (null), biotail (null), buffer (null), data f700fbc4, len 24
    > [    3.452602] ide-cd: hda: ATAPI 1X CD-ROM drive, 32kB Cache
    > [    3.456659] Uniform CD-ROM driver Revision: 3.20
    > [    3.460913] mapping rq to sg: dev hda: type=a, flags=8a640
    > [    3.464697]   sector 4294967295, nr/cnr 0/0
    > [    3.465881]   bio (null), biotail (null), buffer (null), data (null), len 0
    > [    3.472354] Pid: 1, comm: swapper Not tainted 2.6.29-rc6-next-20090227-dirty #10
    > [    3.476790] Call Trace:
    > [    3.477860]  [<c02ef9bd>] ide_cd_do_request+0x12d/0x170
    > [    3.480496]  [<c02e1d28>] start_request+0xa8/0x160
    > [    3.481883]  [<c015d92b>] ? trace_hardirqs_on+0xb/0x10
    > [    3.485680]  [<c02e1f7b>] do_ide_request+0x16b/0x250
    > [    3.489231]  [<c025e5a5>] ? blk_remove_plug+0x75/0xf0
    > [    3.492817]  [<c025f770>] blk_start_queueing+0x20/0x30
    > [    3.495475]  [<c025d2be>] elv_insert+0x17e/0x1b0
    > [    3.497088]  [<c025e458>] ? blk_plug_device+0x88/0x120
    > [    3.499681]  [<c025d372>] __elv_add_request+0x82/0xc0
    > [    3.501428]  [<c0263ad0>] blk_execute_rq_nowait+0x60/0xb0
    > [    3.504214]  [<c0263bb6>] blk_execute_rq+0x96/0xd0
    > [    3.505802]  [<c0263a40>] ? blk_end_sync_rq+0x0/0x30
    > [    3.508392]  [<c025f59c>] ? get_request_wait+0x2c/0x160
    > [    3.509883]  [<c0160429>] ? __lock_acquired+0x109/0x1c0
    > [    3.512691]  [<c025f6f4>] ? blk_get_request+0x24/0x80
    > [    3.515239]  [<c02ef196>] ide_cd_queue_pc+0xb6/0x140

    ok, if I read the stack dump correctly, we map an rq with rq->data = NULL to an
    sg. Code path starts at cdrom_check_status() and actually, we don't need a
    buffer here since we send a TEST_UNIT_READY and we're only interested in the
    sense returned. And this won't trigger if we haven't enabled
    CONFIG_DEBUG_VIRTUAL. Yep, I know that this is a dirty hack but it fixes it
    here. Tetsuo, does the following fix your problem?

    diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
    index 481fb1b..e6ac4cc 100644
    --- a/drivers/ide/ide-io.c
    +++ b/drivers/ide/ide-io.c
    @@ -238,6 +238,8 @@ void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
    sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
    cmd->sg_nents = 1;
    } else if (!rq->bio) {
    + if (!rq->data)
    + rq->data = &rq->data;
    sg_init_one(sg, rq->data, rq->data_len);
    cmd->sg_nents = 1;
    } else
    @Bart: I'm open for suggestions wrt to a more elegant solution :).

    --
    Regards/Gruss,
    Boris
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