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i5000-edac: hold reference to mci kobject

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It turns out that edac_mc_del_mc will kobject_put the last kref on the
mci object.

If the timing is just right, that means that the mci object is freed
before before i5000_remove_one has a chance to free the resources
associated with it, causing a null pointer exceptions when unloading the
driver.  Insert a kobject_{get,put} pair so that this doesn't happen.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Cc: Doug Thompson <norsk5@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Darrick J. Wong 2008-11-12 13:25:36 -08:00 committed by Linus Torvalds
parent fe2d5ffc74
commit f0f7e0dc73
1 changed files with 3 additions and 1 deletions
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4
drivers/edac/i5000_edac.c
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@ -1381,6 +1381,7 @@ static int i5000_probe1(struct pci_dev *pdev, int dev_idx)
if (mci == NULL) if (mci == NULL)
return -ENOMEM; return -ENOMEM;
kobject_get(&mci->edac_mci_kobj);
debugf0("MC: " __FILE__ ": %s(): mci = %p\n", __func__, mci); debugf0("MC: " __FILE__ ": %s(): mci = %p\n", __func__, mci);
mci->dev = &pdev->dev; /* record ptr to the generic device */ mci->dev = &pdev->dev; /* record ptr to the generic device */
@ -1453,6 +1454,7 @@ fail1:
i5000_put_devices(mci); i5000_put_devices(mci);
fail0: fail0:
kobject_put(&mci->edac_mci_kobj);
edac_mc_free(mci); edac_mc_free(mci);
return -ENODEV; return -ENODEV;
} }
@ -1498,7 +1500,7 @@ static void __devexit i5000_remove_one(struct pci_dev *pdev)
/* retrieve references to resources, and free those resources */ /* retrieve references to resources, and free those resources */
i5000_put_devices(mci); i5000_put_devices(mci);
kobject_put(&mci->edac_mci_kobj);
edac_mc_free(mci); edac_mc_free(mci);
} }