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SCSI fixes on 20140819

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These are the two bug fixes I mentioned in the final merge window pull.  One
 is a reversed logic check in the device busy tests which can cause a nasty
 hang and another crash seen in the new SCSI pool support if the use count ever
 goes to zero.
 
 Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "These are the two bug fixes I mentioned in the final merge window
  pull.  One is a reversed logic check in the device busy tests which
  can cause a nasty hang and another crash seen in the new SCSI pool
  support if the use count ever goes to zero"

[ The device busy test already got merged from a patch earlier, so is
  now duplicated.  ]

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  [SCSI] save command pool address of Scsi_Host
  [SCSI] fix qemu boot hang problem
This commit is contained in:
Linus Torvalds 2014-08-20 18:20:50 -05:00
commit be816bc491
1 changed files with 10 additions and 2 deletions
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12
drivers/scsi/scsi.c
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@ -377,6 +377,10 @@ scsi_alloc_host_cmd_pool(struct Scsi_Host *shost)
pool->slab_flags |= SLAB_CACHE_DMA;
pool->gfp_mask = __GFP_DMA;
}
if (hostt->cmd_size)
hostt->cmd_pool = pool;
return pool;
}
@ -421,8 +425,10 @@ scsi_get_host_cmd_pool(struct Scsi_Host *shost)
out_free_slab:
kmem_cache_destroy(pool->cmd_slab);
out_free_pool:
if (hostt->cmd_size)
if (hostt->cmd_size) {
scsi_free_host_cmd_pool(pool);
hostt->cmd_pool = NULL;
}
goto out;
}
@ -444,8 +450,10 @@ static void scsi_put_host_cmd_pool(struct Scsi_Host *shost)
if (!--pool->users) {
kmem_cache_destroy(pool->cmd_slab);
kmem_cache_destroy(pool->sense_slab);
if (hostt->cmd_size)
if (hostt->cmd_size) {
scsi_free_host_cmd_pool(pool);
hostt->cmd_pool = NULL;
}
}
mutex_unlock(&host_cmd_pool_mutex);
}