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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-07-23 17:39:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-07-23 17:39:28 -0700 |
| commit | ea9339e564605286bd04c32c460f8cedc979458c (patch) | |
| tree | 39dae203b2a6fba41ea84cafee57a3124df82a80 /include | |
| parent | b292d6b5c4220d527c92316c0d11d16e9895f07e (diff) | |
| parent | 1a112d10f03e83fb3a2fdc4c9165865dec8a3ca6 (diff) | |
Merge branch 'for-3.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
Pull libata regression fix from Tejun Heo:
"The last libata/for-3.16-fixes pull contained a regression introduced
by 1871ee134b73 ("libata: support the ata host which implements a
queue depth less than 32") which in turn was a fix for a regression
introduced earlier while changing queue tag order to accomodate hard
drives which perform poorly if tags are not allocated in circular
order (ugh...).
The regression happens only for SAS controllers making use of libata
to serve ATA devices. They don't fill an ata_host field which is used
by the new tag allocation function leading to NULL dereference.
This patch adds a new intermediate field ata_host->n_tags which is
initialized for both SAS and !SAS cases to fix the issue"
* 'for-3.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
libata: introduce ata_host->n_tags to avoid oops on SAS controllers
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/libata.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h index 5ab4e3a76721..92abb497ab14 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -593,6 +593,7 @@ struct ata_host { struct device *dev; void __iomem * const *iomap; unsigned int n_ports; + unsigned int n_tags; /* nr of NCQ tags */ void *private_data; struct ata_port_operations *ops; unsigned long flags; |