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@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 7ae6623..0faae30 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -385,7 +385,7 @@
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;
@@ -395,6 +395,9 @@
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;
diff --git a/drivers/ide/ide-floppy_ioctl.c b/drivers/ide/ide-floppy_ioctl.c
index 8f8be85..cd8a420 100644
--- a/drivers/ide/ide-floppy_ioctl.c
+++ b/drivers/ide/ide-floppy_ioctl.c
@@ -36,9 +36,9 @@
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 @@
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;
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 64dfa74..cafc67d 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -2014,9 +2014,13 @@
{
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);
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 03c5209..0f48fbd 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -377,7 +377,7 @@
* 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 {