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cciss: detect bad alignment of scsi commands at build time

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cciss: detect bad alignment of scsi commands at build time
Incidentally fix some nearby c++ style comments.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Stephen M. Cameron 2010-02-26 16:01:17 -06:00 committed by Jens Axboe
parent 58daa9ce96
commit 1b7d0d28ad
3 changed files with 15 additions and 8 deletions
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2
drivers/block/cciss.c
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@ -4496,7 +4496,7 @@ static int __init cciss_init(void)
* 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);
BUILD_BUG_ON(sizeof(CommandList_struct) % COMMANDLIST_ALIGNMENT);
printk(KERN_INFO DRIVER_NAME "\n");

9
drivers/block/cciss_cmd.h
View File

@ -167,10 +167,13 @@ typedef struct _SGDescriptor_struct {
#define CMD_MSG_TIMEOUT 0x05
#define CMD_MSG_STALE 0xff
/* This structure needs to be divisible by 8 for new
* indexing method. PAD_32 and PAD_64 can be adjusted
* independently as needed for 32-bit and 64-bits systems.
/* This structure needs to be divisible by COMMANDLIST_ALIGNMENT
* because low bits of the address are used to to indicate that
* whether the tag contains an index or an address. PAD_32 and
* PAD_64 can be adjusted independently as needed for 32-bit
* and 64-bits systems.
*/
#define COMMANDLIST_ALIGNMENT (8)
#define IS_64_BIT ((sizeof(long) - 4)/4)
#define IS_32_BIT (!IS_64_BIT)
#define PAD_32 (0)

12
drivers/block/cciss_scsi.c
View File

@ -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);