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  1. 07 Aug, 2009 5 commits
    • Borislav Petkov's avatar
      ide-tape: fix handling of postponed rqs · 6f3848ac
      Borislav Petkov authored 
      ide-tape used to hit

[   58.614854] ide-tape: ht0: BUG: Two DSC requests queued!

due to the fact that another rq was being issued while the driver was
waiting for DSC to get set for the device executing ATAPI commands which
set the DSC to 1 to indicate completion.

Here's a sample output of that case:

issue REZERO_UNIT

[  143.088505] ide-tape: ide_tape_issue_pc: retry #0, cmd: 0x01
[  143.095122] ide: Enter ide_pc_intr - interrupt handler
[  143.096118] ide: Packet command completed, 0 bytes transferred
[  143.106319] ide-tape: ide_tape_callback: cmd: 0x1, dsc: 1, err: 0
[  143.112601] ide-tape: idetape_postpone_request: cmd: 0x1, dsc_poll_freq: 2000

we stall the ide-tape queue here waiting for DSC

[  143.119936] ide-tape: ide_tape_read_position: enter
[  145.119019] ide-tape: idetape_do_request: sector: 4294967295, nr_sectors: 0

and issue the new READ_POSITION rq and hit the check.

[  145.126247] ide-tape: ht0: BUG: Two DSC requests queued!
[  145.131748] ide-tape: ide_tape_read_position: BOP - No
[  145.137059] ide-tape: ide_tape_read_position: EOP - No

Also, ->postponed_rq used to point to that postponed request. To make
things worse, in certain circumstances the rq it was pointing to got
replaced unterneath it by swiftly reusing the same rq from the mempool
of the block layer practically confusing stuff even more.

However, we don't need to keep a pointer to that rq but simply wait for
DSC to be set first before issuing the follow-up request in the drive's
queue. In order to do that, we make idetape_do_request() first check the
DSC and if not set, we stall the drive queue giving the other device on
that IDE channel a chance.
Signed-off-by: default avatarBorislav Petkov <petkovbb@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6f3848ac
    • Borislav Petkov's avatar
      ide-tape: convert to ide_debug_log macro · e972d702
      Borislav Petkov authored 
      Remove tape->debug_mask and use drive->debug_mask instead.

There should be no functional change resulting from this patch.
Signed-off-by: default avatarBorislav Petkov <petkovbb@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e972d702
    • Mark de Wever's avatar
      ide-tape: fix debug call · 37bbe084
      Mark de Wever authored 
      This error only occurs when IDETAPE_DEBUG_LOG is enabled.
Signed-off-by: default avatarMark de Wever <koraq@xs4all.nl>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      37bbe084
    • David S. Miller's avatar
      ide: Fix annoying warning in ide_pio_bytes(). · 7fa350b4
      David S. Miller authored 
      GCC can't see that flags is only set and used when PageHighmem() is
true.

Inspired by a patch from Jean Delvare.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7fa350b4
    • Jean Delvare's avatar
      IDE: Save a call to PageHighMem() · a9079052
      Jean Delvare authored 
      PageHighMem() isn't cheap so avoid calling it twice on the same page.
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Acked-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a9079052
  3. 04 Aug, 2009 35 commits