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[SCSI] advansys: fix overrun_buf aligned bug

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struct asc_dvc_var needs overrun buffer to be placed on an 8 byte
boundary. advansys defines struct asc_dvc_var:

struct asc_dvc_var {
	...
	uchar overrun_buf[ASC_OVERRUN_BSIZE] __aligned(8);

The problem is that struct asc_dvc_var is placed on
shost->hostdata. So if the hostdata is not on an 8 byte boundary, the
advansys crashes. The hostdata is placed on a sizeof(unsigned long)
boundary so the 8 byte boundary is not garanteed with x86_32.

With 2.6.23 and 2.6.24, the hostdata is on an 8 byte boundary by
chance, but with the current git, it's not.

This patch removes overrun_buf static array and use kzalloc.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
FUJITA Tomonori 2008-02-08 09:50:08 +09:00 committed by James Bottomley
parent 19af35546d
commit 7d5d408c77
1 changed files with 11 additions and 2 deletions
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13
drivers/scsi/advansys.c
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@ -566,7 +566,7 @@ typedef struct asc_dvc_var {
ASC_SCSI_BIT_ID_TYPE unit_not_ready;
ASC_SCSI_BIT_ID_TYPE queue_full_or_busy;
ASC_SCSI_BIT_ID_TYPE start_motor;
uchar overrun_buf[ASC_OVERRUN_BSIZE] __aligned(8);
uchar *overrun_buf;
dma_addr_t overrun_dma;
uchar scsi_reset_wait;
uchar chip_no;
@ -13833,6 +13833,12 @@ static int __devinit advansys_board_found(struct Scsi_Host *shost,
*/
if (ASC_NARROW_BOARD(boardp)) {
ASC_DBG(2, "AscInitAsc1000Driver()\n");
asc_dvc_varp->overrun_buf = kzalloc(ASC_OVERRUN_BSIZE, GFP_KERNEL);
if (!asc_dvc_varp->overrun_buf) {
ret = -ENOMEM;
goto err_free_wide_mem;
}
warn_code = AscInitAsc1000Driver(asc_dvc_varp);
if (warn_code || asc_dvc_varp->err_code) {
@ -13840,8 +13846,10 @@ static int __devinit advansys_board_found(struct Scsi_Host *shost,
"warn 0x%x, error 0x%x\n",
asc_dvc_varp->init_state, warn_code,
asc_dvc_varp->err_code);
if (asc_dvc_varp->err_code)
if (asc_dvc_varp->err_code) {
ret = -ENODEV;
kfree(asc_dvc_varp->overrun_buf);
}
}
} else {
if (advansys_wide_init_chip(shost))
@ -13894,6 +13902,7 @@ static int advansys_release(struct Scsi_Host *shost)
dma_unmap_single(board->dev,
board->dvc_var.asc_dvc_var.overrun_dma,
ASC_OVERRUN_BSIZE, DMA_FROM_DEVICE);
kfree(board->dvc_var.asc_dvc_var.overrun_buf);
} else {
iounmap(board->ioremap_addr);
advansys_wide_free_mem(board);