On Wednesday 11 February 2009, Borislav Petkov wrote:
> On Tue, Feb 10, 2009 at 12:19:45AM +0100, Bartlomiej Zolnierkiewicz wrote:
> >
> > After this patchset we have a valid struct ide_cmd available also for
> > ATA_CMD_PACKET commands and comparing struct ide_atapi_pc with ide_cmd it
> > seems that there are many similarities between them and that we may just
> > merge both structs (this should also allow us to unify ide-cd code with
> > non-ide-cd one in ide-atapi.c later). From the quick look the only gotcha
There is another gotcha there and this one is worth fixing indpendently of
struct ide_atapi_pc and struct ide_cmd merge:
From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Subject: [PATCH] ide: decrease size of ->pc_buf field in struct ide_atapi_pc
struct ide_atapi_pc is often allocated on the stack and size of ->pc_buf
size is 256 bytes. However since only ide_floppy_create_read_capacity_cmd()
and idetape_create_inquiry_cmd() require such size allocate buffers for
these pc-s explicitely and decrease ->pc_buf size to 64 bytes.
Cc: Borislav Petkov <petkovbb@xxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
---
drivers/ide/ide-floppy.c | 5 ++++-
drivers/ide/ide-floppy_ioctl.c | 5 ++++-
drivers/ide/ide-tape.c | 4 ++++
include/linux/ide.h | 2 +-
4 files changed, 13 insertions(+), 3 deletions(-)
Index: b/drivers/ide/ide-floppy.c
===================================================================
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -377,7 +377,7 @@ static int ide_floppy_get_capacity(ide_d
struct gendisk *disk = floppy->disk;
struct ide_atapi_pc pc;
u8 *cap_desc;
- u8 header_len, desc_cnt;
+ u8 pc_buf[256], header_len, desc_cnt;
int i, rc = 1, blocks, length;
drive->bios_cyl = 0;
@@ -387,6 +387,9 @@ static int ide_floppy_get_capacity(ide_d
drive->capacity64 = 0;
ide_floppy_create_read_capacity_cmd(&pc);
+ pc.buf = &pc_buf[0];
+ pc.buf_size = sizeof(pc_buf);
+
if (ide_queue_pc_tail(drive, disk, &pc)) {
printk(KERN_ERR PFX "Can't get floppy parameters\n");
return 1;
Index: b/drivers/ide/ide-floppy_ioctl.c
===================================================================
--- a/drivers/ide/ide-floppy_ioctl.c
+++ b/drivers/ide/ide-floppy_ioctl.c
@@ -36,9 +36,9 @@ static int ide_floppy_get_format_capacit
int __user *arg)
{
struct ide_disk_obj *floppy = drive->driver_data;
- u8 header_len, desc_cnt;
int i, blocks, length, u_array_size, u_index;
int __user *argp;
+ u8 pc_buf[256], header_len, desc_cnt;
if (get_user(u_array_size, arg))
return -EFAULT;
@@ -47,6 +47,9 @@ static int ide_floppy_get_format_capacit
return -EINVAL;
ide_floppy_create_read_capacity_cmd(pc);
+ pc->buf = &pc_buf[0];
+ pc->buf_size = sizeof(pc_buf);
+
if (ide_queue_pc_tail(drive, floppy->disk, pc)) {
printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
return -EIO;
Index: b/drivers/ide/ide-tape.c
===================================================================
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -2014,9 +2014,13 @@ static void idetape_get_inquiry_results(
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc pc;
+ u8 pc_buf[256];
char fw_rev[4], vendor_id[8], product_id[16];
idetape_create_inquiry_cmd(&pc);
+ pc.buf = &pc_buf[0];
+ pc.buf_size = sizeof(pc_buf);
+
if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
tape->name);
Index: b/include/linux/ide.h
===================================================================
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -377,7 +377,7 @@ enum {
* With each packet command, we allocate a buffer of IDE_PC_BUFFER_SIZE bytes.
* This is used for several packet commands (not for READ/WRITE commands).
*/
-#define IDE_PC_BUFFER_SIZE 256
+#define IDE_PC_BUFFER_SIZE 64
#define ATAPI_WAIT_PC (60 * HZ)
struct ide_atapi_pc {
--
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