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| author | Jens Axboe <jens.axboe@oracle.com> | 2009-02-27 20:14:20 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-03-24 12:35:16 +0100 |
| commit | 10cbda97e73c7d537d7174eadb2d098484f8f1da (patch) | |
| tree | 9e67224345a082533d273f4926ce3281d6fe8bf1 | |
| parent | a7fcd37cdcb47806fb8a9070f006ee34061defa6 (diff) | |
cciss: add BUILD_BUG_ON() for catching bad CommandList_struct alignment
The hardware requires 64-bit alignment of commands, so add a build bug
check for that. The recent commit 8a3173de4ab4cdacc43675dc5c077f9a5bf17f5f
didn't change the size of the command, but other additions/changes may and
thus break badly at runtime.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | drivers/block/cciss.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 4f9b6d792017..5d0e135824f9 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -3898,6 +3898,13 @@ static struct pci_driver cciss_pci_driver = { */ static int __init cciss_init(void) { + /* + * The hardware requires that commands are aligned on a 64-bit + * boundary. Given that we use pci_alloc_consistent() to allocate an + * array of them, the size must be a multiple of 8 bytes. + */ + BUILD_BUG_ON(sizeof(CommandList_struct) % 8); + printk(KERN_INFO DRIVER_NAME "\n"); /* Register for our PCI devices */ |