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mm: fix XIP file writes

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Writing to XIP files at a non-page-aligned offset results in data corruption
because the writes were always sent to the start of the page.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2007-12-04 23:45:25 -08:00 committed by Linus Torvalds
parent 4670df831c
commit 369b8f5a70
1 changed files with 1 additions and 1 deletions
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mm/filemap_xip.c
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@ -314,7 +314,7 @@ __xip_file_write(struct file *filp, const char __user *buf,
fault_in_pages_readable(buf, bytes);
kaddr = kmap_atomic(page, KM_USER0);
copied = bytes -
__copy_from_user_inatomic_nocache(kaddr, buf, bytes);
__copy_from_user_inatomic_nocache(kaddr + offset, buf, bytes);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);