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vxge: Align the memory only if it is misaligned.

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- Align the memory only if it is misaligned.

Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sreenivasa Honnur 2010-03-28 22:09:47 +00:00 committed by David S. Miller
parent 3363276f1c
commit 47231f7fb4
1 changed files with 16 additions and 4 deletions
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20
drivers/net/vxge/vxge-config.h
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@ -1914,20 +1914,32 @@ static inline void *vxge_os_dma_malloc(struct pci_dev *pdev,
gfp_t flags;
void *vaddr;
unsigned long misaligned = 0;
int realloc_flag = 0;
*p_dma_acch = *p_dmah = NULL;
if (in_interrupt())
flags = GFP_ATOMIC | GFP_DMA;
else
flags = GFP_KERNEL | GFP_DMA;
size += VXGE_CACHE_LINE_SIZE;
realloc:
vaddr = kmalloc((size), flags);
if (vaddr == NULL)
return vaddr;
misaligned = (unsigned long)VXGE_ALIGN(*((u64 *)&vaddr),
misaligned = (unsigned long)VXGE_ALIGN((unsigned long)vaddr,
VXGE_CACHE_LINE_SIZE);
if (realloc_flag)
goto out;
if (misaligned) {
/* misaligned, free current one and try allocating
* size + VXGE_CACHE_LINE_SIZE memory
*/
kfree((void *) vaddr);
size += VXGE_CACHE_LINE_SIZE;
realloc_flag = 1;
goto realloc;
}
out:
*(unsigned long *)p_dma_acch = misaligned;
vaddr = (void *)((u8 *)vaddr + misaligned);
return vaddr;