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Commit 7ae79d7f authored by Artem Bityutskiy's avatar Artem Bityutskiy Committed by David Woodhouse
Browse files

mtd: introduce mtd_panic_write interface 



Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent eda95cbf

drivers/mtd/mtdoops.c

+2 −2
Original line number Diff line number Diff line
@@ -222,7 +222,7 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic) 
	hdr[1] = MTDOOPS_KERNMSG_MAGIC;



	if (panic)

		ret = mtd->panic_write(mtd, cxt->nextpage * record_size,

		ret = mtd_panic_write(mtd, cxt->nextpage * record_size,

				      record_size, &retlen, cxt->oops_buf);

	else

		ret = mtd_write(mtd, cxt->nextpage * record_size,

drivers/mtd/mtdpart.c

+2 −2
Original line number Diff line number Diff line
@@ -201,8 +201,8 @@ static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len, 
		len = 0;

	else if (to + len > mtd->size)

		len = mtd->size - to;

	return part->master->panic_write(part->master, to + part->offset,

				    len, retlen, buf);

	return mtd_panic_write(part->master, to + part->offset, len, retlen,

			       buf);

}



static int part_write_oob(struct mtd_info *mtd, loff_t to,

include/linux/mtd/mtd.h

+15 −10
Original line number Diff line number Diff line
@@ -186,6 +186,8 @@ struct mtd_info { 
		     size_t *retlen, u_char *buf);

	int (*write) (struct mtd_info *mtd, loff_t to, size_t len,

		      size_t *retlen, const u_char *buf);

	int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len,

			    size_t *retlen, const u_char *buf);



	/* Backing device capabilities for this device

	 * - provides mmap capabilities
@@ -193,16 +195,6 @@ struct mtd_info { 
	struct backing_dev_info *backing_dev_info;







	/* In blackbox flight recorder like scenarios we want to make successful

	   writes in interrupt context. panic_write() is only intended to be

	   called when its known the kernel is about to panic and we need the

	   write to succeed. Since the kernel is not going to be running for much

	   longer, this function can break locks and delay to ensure the write

	   succeeds (but not sleep). */



	int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);



	int (*read_oob) (struct mtd_info *mtd, loff_t from,

			 struct mtd_oob_ops *ops);

	int (*write_oob) (struct mtd_info *mtd, loff_t to,
@@ -315,6 +307,19 @@ static inline int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, 
	return mtd->write(mtd, to, len, retlen, buf);

}



/*

 * In blackbox flight recorder like scenarios we want to make successful writes

 * in interrupt context. panic_write() is only intended to be called when its

 * known the kernel is about to panic and we need the write to succeed. Since

 * the kernel is not going to be running for much longer, this function can

 * break locks and delay to ensure the write succeeds (but not sleep).

 */

static inline int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len,

				  size_t *retlen, const u_char *buf)

{

	return mtd->panic_write(mtd, to, len, retlen, buf);

}



static inline struct mtd_info *dev_to_mtd(struct device *dev)

{

	return dev ? dev_get_drvdata(dev) : NULL;