Commit 884cfd90 authored by Boris Brezillon's avatar Boris Brezillon
Browse files

mtd: Stop assuming mtd_erase() is asynchronous 



None of the mtd->_erase() implementations work in an asynchronous manner,
so let's simplify MTD users that call mtd_erase(). All they need to do
is check the value returned by mtd_erase() and assume that != 0 means
failure.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: default avatarRichard Weinberger <richard@nod.at>
parent dcba51bb

drivers/mtd/devices/bcm47xxsflash.c

+0 −3
Original line number Diff line number Diff line
@@ -95,9 +95,6 @@ static int bcm47xxsflash_erase(struct mtd_info *mtd, struct erase_info *erase) 
	else

		erase->state = MTD_ERASE_DONE;



	if (erase->callback)

		erase->callback(erase);



	return err;

}

drivers/mtd/ftl.c

+8 −43
Original line number Diff line number Diff line
@@ -140,12 +140,6 @@ typedef struct partition_t { 
#define XFER_PREPARED	0x03

#define XFER_FAILED	0x04



/*====================================================================*/





static void ftl_erase_callback(struct erase_info *done);





/*======================================================================



    Scan_header() checks to see if a memory region contains an FTL
@@ -349,16 +343,18 @@ static int erase_xfer(partition_t *part, 
            return -ENOMEM;



    erase->mtd = part->mbd.mtd;

    erase->callback = ftl_erase_callback;

    erase->addr = xfer->Offset;

    erase->len = 1 << part->header.EraseUnitSize;

    erase->priv = (u_long)part;



    ret = mtd_erase(part->mbd.mtd, erase);



    if (!ret)

    if (!ret) {

	xfer->state = XFER_ERASED;

	xfer->EraseCount++;

    else

    } else {

	xfer->state = XFER_FAILED;

	pr_notice("ftl_cs: erase failed: err = %d\n", ret);

    }



    kfree(erase);



    return ret;
@@ -371,37 +367,6 @@ static int erase_xfer(partition_t *part, 


======================================================================*/



static void ftl_erase_callback(struct erase_info *erase)

{

    partition_t *part;

    struct xfer_info_t *xfer;

    int i;



    /* Look up the transfer unit */

    part = (partition_t *)(erase->priv);



    for (i = 0; i < part->header.NumTransferUnits; i++)

	if (part->XferInfo[i].Offset == erase->addr) break;



    if (i == part->header.NumTransferUnits) {

	printk(KERN_NOTICE "ftl_cs: internal error: "

	       "erase lookup failed!\n");

	return;

    }



    xfer = &part->XferInfo[i];

    if (erase->state == MTD_ERASE_DONE)

	xfer->state = XFER_ERASED;

    else {

	xfer->state = XFER_FAILED;

	printk(KERN_NOTICE "ftl_cs: erase failed: state = %d\n",

	       erase->state);

    }



    kfree(erase);



} /* ftl_erase_callback */



static int prepare_xfer(partition_t *part, int i)

{

    erase_unit_header_t header;

drivers/mtd/inftlmount.c

+3 −2
Original line number Diff line number Diff line
@@ -393,9 +393,10 @@ int INFTL_formatblock(struct INFTLrecord *inftl, int block) 
	   mark only the failed block in the bbt. */

	for (physblock = 0; physblock < inftl->EraseSize;

	     physblock += instr->len, instr->addr += instr->len) {

		mtd_erase(inftl->mbd.mtd, instr);

		int ret;



		if (instr->state == MTD_ERASE_FAILED) {

		ret = mtd_erase(inftl->mbd.mtd, instr);

		if (ret) {

			printk(KERN_WARNING "INFTL: error while formatting block %d\n",

				block);

			goto fail;

drivers/mtd/mtdblock.c

+0 −20
Original line number Diff line number Diff line
@@ -55,48 +55,28 @@ struct mtdblk_dev { 
 * being written to until a different sector is required.

 */



static void erase_callback(struct erase_info *done)

{

	wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;

	wake_up(wait_q);

}



static int erase_write (struct mtd_info *mtd, unsigned long pos,

			int len, const char *buf)

{

	struct erase_info erase;

	DECLARE_WAITQUEUE(wait, current);

	wait_queue_head_t wait_q;

	size_t retlen;

	int ret;



	/*

	 * First, let's erase the flash block.

	 */



	init_waitqueue_head(&wait_q);

	erase.mtd = mtd;

	erase.callback = erase_callback;

	erase.addr = pos;

	erase.len = len;

	erase.priv = (u_long)&wait_q;



	set_current_state(TASK_INTERRUPTIBLE);

	add_wait_queue(&wait_q, &wait);



	ret = mtd_erase(mtd, &erase);

	if (ret) {

		set_current_state(TASK_RUNNING);

		remove_wait_queue(&wait_q, &wait);

		printk (KERN_WARNING "mtdblock: erase of region [0x%lx, 0x%x] "

				     "on \"%s\" failed\n",

			pos, len, mtd->name);

		return ret;

	}



	schedule();  /* Wait for erase to finish. */

	remove_wait_queue(&wait_q, &wait);



	/*

	 * Next, write the data to flash.

	 */

drivers/mtd/mtdchar.c

+1 −32
Original line number Diff line number Diff line
@@ -324,10 +324,6 @@ static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t c 
    IOCTL calls for getting device parameters.



======================================================================*/

static void mtdchar_erase_callback (struct erase_info *instr)

{

	wake_up((wait_queue_head_t *)instr->priv);

}



static int otp_select_filemode(struct mtd_file_info *mfi, int mode)

{
@@ -709,11 +705,6 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) 
		if (!erase)

			ret = -ENOMEM;

		else {

			wait_queue_head_t waitq;

			DECLARE_WAITQUEUE(wait, current);



			init_waitqueue_head(&waitq);



			if (cmd == MEMERASE64) {

				struct erase_info_user64 einfo64;
@@ -736,30 +727,8 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) 
				erase->len = einfo32.length;

			}

			erase->mtd = mtd;

			erase->callback = mtdchar_erase_callback;

			erase->priv = (unsigned long)&waitq;



			/*

			  FIXME: Allow INTERRUPTIBLE. Which means

			  not having the wait_queue head on the stack.



			  If the wq_head is on the stack, and we

			  leave because we got interrupted, then the

			  wq_head is no longer there when the

			  callback routine tries to wake us up.

			*/

			ret = mtd_erase(mtd, erase);

			if (!ret) {

				set_current_state(TASK_UNINTERRUPTIBLE);

				add_wait_queue(&waitq, &wait);

				if (erase->state != MTD_ERASE_DONE &&

				    erase->state != MTD_ERASE_FAILED)

					schedule();

				remove_wait_queue(&waitq, &wait);

				set_current_state(TASK_RUNNING);



				ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;

			}

			kfree(erase);

		}

		break;

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