UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

[PATCH] cciss: Fix warnings (and bug on 1TB discs) 

CCISS was producing warnings about shifts being greater than the size of
the type and pointers being of incompatible type.  Turns out this is
because it's calling do_div on a 32-bit quantity.  Upon further
investigation, the sector_t total_size is being assigned to an int, and
then we're calling do_div on that int.  Obviously, sector_div is called for
here, and I took the chance to refactor the code a little.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Acked-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Matthew Wilcox 2006-10-21 10:24:19 -07:00 committed by Linus Torvalds
parent 8a7822a61c
commit 3f7705eab6
1 changed files with 9 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/block/cciss.c
View File

@ -1923,7 +1923,6 @@ static void cciss_geometry_inquiry(int ctlr, int logvol,
{
int return_code;
unsigned long t;
unsigned long rem;
memset(inq_buff, 0, sizeof(InquiryData_struct));
if (withirq)
@ -1939,26 +1938,23 @@ static void cciss_geometry_inquiry(int ctlr, int logvol,
printk(KERN_WARNING
"cciss: reading geometry failed, volume "
"does not support reading geometry\n");
drv->block_size = block_size;
drv->nr_blocks = total_size;
drv->heads = 255;
drv->sectors = 32; // Sectors per track
t = drv->heads * drv->sectors;
drv->cylinders = total_size;
rem = do_div(drv->cylinders, t);
} else {
drv->block_size = block_size;
drv->nr_blocks = total_size;
drv->heads = inq_buff->data_byte[6];
drv->sectors = inq_buff->data_byte[7];
drv->cylinders = (inq_buff->data_byte[4] & 0xff) << 8;
drv->cylinders += inq_buff->data_byte[5];
drv->raid_level = inq_buff->data_byte[8];
}
drv->block_size = block_size;
drv->nr_blocks = total_size;
t = drv->heads * drv->sectors;
if (t > 1) {
unsigned rem = sector_div(total_size, t);
if (rem)
total_size++;
drv->cylinders = total_size;
rem = do_div(drv->cylinders, t);
}
}
} else { /* Get geometry failed */
printk(KERN_WARNING "cciss: reading geometry failed\n");