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| author | Borislav Petkov <petkovbb@gmail.com> | 2009-06-26 11:22:37 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-06-26 11:22:37 -0700 |
| commit | 9c72ebef5aabf3532469d602a9d87beceea268b1 (patch) | |
| tree | 9f3106fb47e0a8125254f2331dbd8f034793c131 /drivers/ide/ide-cd.c | |
| parent | 5e955245d6cf49c5ed26c7add7392ff5a6762bf4 (diff) | |
| download | linux-3.10-9c72ebef5aabf3532469d602a9d87beceea268b1.tar.gz linux-3.10-9c72ebef5aabf3532469d602a9d87beceea268b1.tar.bz2 linux-3.10-9c72ebef5aabf3532469d602a9d87beceea268b1.zip | |
ide-cd: handle fragmented packet commands gracefully
There are some devices in the wild that clear the DRQ bit during the
last word of a packet command and therefore could use a "second chance"
for that last word of data to be xferred instead of simply failing the
request. Do that by attempting to suck in those last bytes in PIO mode.
In addition, the ATA_ERR bit has to be cleared for we cannot be sure the
data is valid otherwise.
See http://bugzilla.kernel.org/show_bug.cgi?id=13399 for details.
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ide/ide-cd.c')
| -rw-r--r-- | drivers/ide/ide-cd.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c index f0ede5953af..6a9a769bffc 100644 --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -592,9 +592,19 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive) } } else if (!blk_pc_request(rq)) { ide_cd_request_sense_fixup(drive, cmd); - /* complain if we still have data left to transfer */ + uptodate = cmd->nleft ? 0 : 1; - if (uptodate == 0) + + /* + * suck out the remaining bytes from the drive in an + * attempt to complete the data xfer. (see BZ#13399) + */ + if (!(stat & ATA_ERR) && !uptodate && thislen) { + ide_pio_bytes(drive, cmd, write, thislen); + uptodate = cmd->nleft ? 0 : 1; + } + + if (!uptodate) rq->cmd_flags |= REQ_FAILED; } goto out_end; |