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authorBrian Norris <computersforpeace@gmail.com>2010-08-24 18:12:00 -0700
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-10-24 23:37:24 +0100
commitcc26c3cd3d1cf40a07f2b19ac4c53d517bee52a5 (patch)
tree664c422944f780a1cc99f872714eeb339efef7ef /include/mtd/mtd-abi.h
parentf4a2da0cd522a3b805ff2386c14912945bf990c7 (diff)
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mtd: nand: expand nand_ecc_layout, deprecate ioctl ECCGETLAYOUT
struct nand_ecclayout is too small for many new chips; OOB regions can be as large as 448 bytes and may increase more in the future. Thus, copying that struct to user-space with the ECCGETLAYOUT ioctl is not a good idea; the ioctl would have to be updated every time there's a change to the current largest size. Instead, the old nand_ecclayout is renamed to nand_ecclayout_user and a new struct nand_ecclayout is created that can accomodate larger sizes and expand without affecting the user-space. struct nand_ecclayout can still be used in board drivers without modification -- at least for now. A new function is provided to convert from the new to the old in order to allow the deprecated ioctl to continue to work with truncated data. Perhaps the ioctl, the conversion process, and the struct nand_ecclayout_user can be removed altogether in the future. Note: There are comments in nand/davinci_nand.c::nand_davinci_probe() regarding this issue; this driver (and maybe others) can be updated to account for extra space. All kernel drivers can use the expanded nand_ecclayout as a drop-in replacement and ignore its benefits. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'include/mtd/mtd-abi.h')
-rw-r--r--include/mtd/mtd-abi.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/mtd/mtd-abi.h b/include/mtd/mtd-abi.h
index 4debb451463..5bce0838434 100644
--- a/include/mtd/mtd-abi.h
+++ b/include/mtd/mtd-abi.h
@@ -119,7 +119,7 @@ struct otp_info {
#define OTPGETREGIONCOUNT _IOW('M', 14, int)
#define OTPGETREGIONINFO _IOW('M', 15, struct otp_info)
#define OTPLOCK _IOR('M', 16, struct otp_info)
-#define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout)
+#define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout_user)
#define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
#define MTDFILEMODE _IO('M', 19)
#define MEMERASE64 _IOW('M', 20, struct erase_info_user64)
@@ -148,7 +148,7 @@ struct nand_oobfree {
* ECC layout control structure. Exported to userspace for
* diagnosis and to allow creation of raw images
*/
-struct nand_ecclayout {
+struct nand_ecclayout_user {
__u32 eccbytes;
__u32 eccpos[64];
__u32 oobavail;