From 1b7d0d28ad82cbd5650c26ec8e370176b112e407 Mon Sep 17 00:00:00 2001 From: "Stephen M. Cameron" Date: Fri, 26 Feb 2010 16:01:17 -0600 Subject: cciss: detect bad alignment of scsi commands at build time cciss: detect bad alignment of scsi commands at build time Incidentally fix some nearby c++ style comments. Signed-off-by: Stephen M. Cameron Signed-off-by: Jens Axboe --- drivers/block/cciss_scsi.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'drivers/block/cciss_scsi.c') diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c index 5d0e46dc3632..f203606faaff 100644 --- a/drivers/block/cciss_scsi.c +++ b/drivers/block/cciss_scsi.c @@ -93,11 +93,15 @@ static struct scsi_host_template cciss_driver_template = { }; #pragma pack(1) + +#define SCSI_PAD_32 4 +#define SCSI_PAD_64 4 + struct cciss_scsi_cmd_stack_elem_t { CommandList_struct cmd; ErrorInfo_struct Err; __u32 busaddr; - __u32 pad; + u8 pad[IS_32_BIT * SCSI_PAD_32 + IS_64_BIT * SCSI_PAD_64]; }; #pragma pack() @@ -202,9 +206,9 @@ scsi_cmd_stack_setup(int ctlr, struct cciss_scsi_adapter_data_t *sa) stk = &sa->cmd_stack; size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * CMD_STACK_SIZE; - // pci_alloc_consistent guarantees 32-bit DMA address will - // be used - + /* Check alignment, see cciss_cmd.h near CommandList_struct def. */ + BUILD_BUG_ON((sizeof(*stk->pool) % COMMANDLIST_ALIGNMENT) != 0); + /* pci_alloc_consistent guarantees 32-bit DMA address will be used */ stk->pool = (struct cciss_scsi_cmd_stack_elem_t *) pci_alloc_consistent(hba[ctlr]->pdev, size, &stk->cmd_pool_handle); -- cgit v1.2.3