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sm501: fixup allocation code to be 64bit resource compliant

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As pointed out by Andrew Morton, we have a problem when setting the 64bit
resources option.  Alter the allocation routines to remove the need to use
the start and end fields, use the proper HEAD_PANEL/HEAD_CRT and update
the comments.

Note, we also fix the bug where we failed to check the size of the
CRT memory allocation.

[akpm@linux-foundation.org: cleanup]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ben Dooks 2008-07-23 21:31:37 -07:00 committed by Linus Torvalds
parent 9b599fb2fc
commit d05254190d
1 changed files with 42 additions and 11 deletions
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53
drivers/video/sm501fb.c
View file

@ -48,10 +48,15 @@ enum sm501_controller {
HEAD_PANEL = 1,
};
/* SM501 memory address */
/* SM501 memory address.
*
* This structure is used to track memory usage within the SM501 framebuffer
* allocation. The sm_addr field is stored as an offset as it is often used
* against both the physical and mapped addresses.
*/
struct sm501_mem {
unsigned long size;
unsigned long sm_addr;
unsigned long sm_addr; /* offset from base of sm501 fb. */
void __iomem *k_addr;
};
@ -142,37 +147,63 @@ static inline void sm501fb_sync_regs(struct sm501fb_info *info)
static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
unsigned int why, size_t size)
{
unsigned int ptr = 0;
unsigned int end;
struct sm501fb_par *par;
struct fb_info *fbi;
unsigned int ptr;
unsigned int end;
switch (why) {
case SM501_MEMF_CURSOR:
ptr = inf->fbmem_len - size;
inf->fbmem_len = ptr;
inf->fbmem_len = ptr; /* adjust available memory. */
break;
case SM501_MEMF_PANEL:
ptr = inf->fbmem_len - size;
fbi = inf->fb[0];
fbi = inf->fb[HEAD_CRT];
/* round down, some programs such as directfb do not draw
* 0,0 correctly unless the start is aligned to a page start.
*/
if (ptr > 0)
ptr &= ~(PAGE_SIZE - 1);
if (fbi && ptr < fbi->fix.smem_len)
return -ENOMEM;
if (ptr < 0)
return -ENOMEM;
break;
case SM501_MEMF_CRT:
ptr = 0;
/* check to see if we have panel memory allocated
* which would put an limit on available memory. */
fbi = inf->fb[HEAD_PANEL];
if (fbi) {
par = fbi->par;
end = par->screen.k_addr ? par->screen.sm_addr : inf->fbmem_len;
} else
end = inf->fbmem_len;
if ((ptr + size) > end)
return -ENOMEM;
break;
case SM501_MEMF_ACCEL:
fbi = inf->fb[0];
fbi = inf->fb[HEAD_CRT];
ptr = fbi ? fbi->fix.smem_len : 0;
fbi = inf->fb[1];
if (fbi)
end = (fbi->fix.smem_start - inf->fbmem_res->start);
else
fbi = inf->fb[HEAD_PANEL];
if (fbi) {
par = fbi->par;
end = par->screen.sm_addr;
} else
end = inf->fbmem_len;
if ((ptr + size) > end)