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authorSascha Hauer <s.hauer@pengutronix.de>2019-12-13 09:04:08 +0100
committerJens Axboe <axboe@kernel.dk>2019-12-25 17:08:33 -0700
commit8385d756e114f2df8568e508902d5f9850817ffb (patch)
treebce14f4150f1cd71b5ee5c45fbcfc2848bcf0440 /include/linux/libata.h
parentLinux 5.5-rc3 (diff)
downloadlinux-dev-8385d756e114f2df8568e508902d5f9850817ffb.tar.xz
linux-dev-8385d756e114f2df8568e508902d5f9850817ffb.zip
libata: Fix retrieving of active qcs
ata_qc_complete_multiple() is called with a mask of the still active tags. mv_sata doesn't have this information directly and instead calculates the still active tags from the started tags (ap->qc_active) and the finished tags as (ap->qc_active ^ done_mask) Since 28361c40368 the hw_tag and tag are no longer the same and the equation is no longer valid. In ata_exec_internal_sg() ap->qc_active is initialized as 1ULL << ATA_TAG_INTERNAL, but in hardware tag 0 is started and this will be in done_mask on completion. ap->qc_active ^ done_mask becomes 0x100000000 ^ 0x1 = 0x100000001 and thus tag 0 used as the internal tag will never be reported as completed. This is fixed by introducing ata_qc_get_active() which returns the active hardware tags and calling it where appropriate. This is tested on mv_sata, but sata_fsl and sata_nv suffer from the same problem. There is another case in sata_nv that most likely needs fixing as well, but this looks a little different, so I wasn't confident enough to change that. Fixes: 28361c403683 ("libata: add extra internal command") Cc: stable@vger.kernel.org Tested-by: Pali Rohár <pali.rohar@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Add missing export of ata_qc_get_active(), as per Pali. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/libata.h')
-rw-r--r--include/linux/libata.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h
index d3bbfddf616a..2dbde119721d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1175,6 +1175,7 @@ extern unsigned int ata_do_dev_read_id(struct ata_device *dev,
struct ata_taskfile *tf, u16 *id);
extern void ata_qc_complete(struct ata_queued_cmd *qc);
extern int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active);
+extern u64 ata_qc_get_active(struct ata_port *ap);
extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd);
extern int ata_std_bios_param(struct scsi_device *sdev,
struct block_device *bdev,