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authorMatthew Wilcox <matthew@wil.cx>2006-10-21 10:24:19 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-21 13:35:06 -0700
commit3f7705eab6722ad1a346d748c4aad55755d6c241 (patch)
treed6284a55119568e4a53ce31e35f91245a613d09e /drivers/block
parent8a7822a61ca9c22f464c0b79f455e62cccee747e (diff)
[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>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/cciss.c22
1 files changed, 9 insertions, 13 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index dcccaf2782f3..bc6602606fb5 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -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];
- t = drv->heads * drv->sectors;
- if (t > 1) {
- drv->cylinders = total_size;
- rem = do_div(drv->cylinders, t);
- }
+ }
+ 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;
}
} else { /* Get geometry failed */
printk(KERN_WARNING "cciss: reading geometry failed\n");