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UBI: fix error path in create_vtbl()

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There were several bugs in volume table creation error path. Thanks to
Satyam Sharma <satyam.sharma@gmail.com> and Florin Malita <fmalita@gmail.com>
for finding and analysing them: http://lkml.org/lkml/2007/5/3/274

This patch makes ubi_scan_add_to_list() static and renames it to
add_to_list(), just because it is not needed outside scan.c anymore.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2007-05-05 11:24:02 +03:00
parent c4e90ec013
commit 78d87c95b8
3 changed files with 35 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/mtd/ubi/scan.c
View File

@ -24,7 +24,7 @@
* This unit is responsible for scanning the flash media, checking UBI
* headers and providing complete information about the UBI flash image.
*
* The scanning information is reoresented by a &struct ubi_scan_info' object.
* The scanning information is represented by a &struct ubi_scan_info' object.
* Information about found volumes is represented by &struct ubi_scan_volume
* objects which are kept in volume RB-tree with root at the @volumes field.
* The RB-tree is indexed by the volume ID.
@ -55,8 +55,19 @@ static int paranoid_check_si(const struct ubi_device *ubi,
static struct ubi_ec_hdr *ech;
static struct ubi_vid_hdr *vidh;
int ubi_scan_add_to_list(struct ubi_scan_info *si, int pnum, int ec,
struct list_head *list)
/*
* add_to_list - add physical eraseblock to a list.
* @si: scanning information
* @pnum: physical eraseblock number to add
* @ec: erase counter of the physical eraseblock
* @list: the list to add to
*
* This function adds physical eraseblock @pnum to free, erase, corrupted or
* alien lists. Returns zero in case of success and a negative error code in
* case of failure.
*/
static int add_to_list(struct ubi_scan_info *si, int pnum, int ec,
struct list_head *list)
{
struct ubi_scan_leb *seb;
@ -492,11 +503,11 @@ int ubi_scan_add_used(const struct ubi_device *ubi, struct ubi_scan_info *si,
return err;
if (cmp_res & 4)
err = ubi_scan_add_to_list(si, seb->pnum,
seb->ec, &si->corr);
err = add_to_list(si, seb->pnum, seb->ec,
&si->corr);
else
err = ubi_scan_add_to_list(si, seb->pnum,
seb->ec, &si->erase);
err = add_to_list(si, seb->pnum, seb->ec,
&si->erase);
if (err)
return err;
@ -517,11 +528,9 @@ int ubi_scan_add_used(const struct ubi_device *ubi, struct ubi_scan_info *si,
* previously.
*/
if (cmp_res & 4)
return ubi_scan_add_to_list(si, pnum, ec,
&si->corr);
return add_to_list(si, pnum, ec, &si->corr);
else
return ubi_scan_add_to_list(si, pnum, ec,
&si->erase);
return add_to_list(si, pnum, ec, &si->erase);
}
}
@ -754,7 +763,7 @@ struct ubi_scan_leb *ubi_scan_get_free_peb(const struct ubi_device *ubi,
* @si: scanning information
* @pnum: the physical eraseblock number
*
* This function returns a zero if the physical eraseblock was succesfully
* This function returns a zero if the physical eraseblock was successfully
* handled and a negative error code in case of failure.
*/
static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, int pnum)
@ -783,8 +792,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, int pnum
else if (err == UBI_IO_BITFLIPS)
bitflips = 1;
else if (err == UBI_IO_PEB_EMPTY)
return ubi_scan_add_to_list(si, pnum, UBI_SCAN_UNKNOWN_EC,
&si->erase);
return add_to_list(si, pnum, UBI_SCAN_UNKNOWN_EC, &si->erase);
else if (err == UBI_IO_BAD_EC_HDR) {
/*
* We have to also look at the VID header, possibly it is not
@ -832,13 +840,13 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, int pnum
else if (err == UBI_IO_BAD_VID_HDR ||
(err == UBI_IO_PEB_FREE && ec_corr)) {
/* VID header is corrupted */
err = ubi_scan_add_to_list(si, pnum, ec, &si->corr);
err = add_to_list(si, pnum, ec, &si->corr);
if (err)
return err;
goto adjust_mean_ec;
} else if (err == UBI_IO_PEB_FREE) {
/* No VID header - the physical eraseblock is free */
err = ubi_scan_add_to_list(si, pnum, ec, &si->free);
err = add_to_list(si, pnum, ec, &si->free);
if (err)
return err;
goto adjust_mean_ec;
@ -853,7 +861,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, int pnum
case UBI_COMPAT_DELETE:
ubi_msg("\"delete\" compatible internal volume %d:%d"
" found, remove it", vol_id, lnum);
err = ubi_scan_add_to_list(si, pnum, ec, &si->corr);
err = add_to_list(si, pnum, ec, &si->corr);
if (err)
return err;
break;
@ -868,7 +876,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, int pnum
case UBI_COMPAT_PRESERVE:
ubi_msg("\"preserve\" compatible internal volume %d:%d"
" found", vol_id, lnum);
err = ubi_scan_add_to_list(si, pnum, ec, &si->alien);
err = add_to_list(si, pnum, ec, &si->alien);
if (err)
return err;
si->alien_peb_count += 1;
@ -1109,7 +1117,7 @@ static int paranoid_check_si(const struct ubi_device *ubi,
uint8_t *buf;
/*
* At first, check that scanning information is ok.
* At first, check that scanning information is OK.
*/
ubi_rb_for_each_entry(rb1, sv, &si->volumes, rb) {
int leb_count = 0;

2
drivers/mtd/ubi/scan.h
View File

@ -147,8 +147,6 @@ static inline void ubi_scan_move_to_list(struct ubi_scan_volume *sv,
list_add_tail(&seb->u.list, list);
}
int ubi_scan_add_to_list(struct ubi_scan_info *si, int pnum, int ec,
struct list_head *list);
int ubi_scan_add_used(const struct ubi_device *ubi, struct ubi_scan_info *si,
int pnum, int ec, const struct ubi_vid_hdr *vid_hdr,
int bitflips);

14
drivers/mtd/ubi/vtbl.c
View File

@ -317,13 +317,15 @@ retry:
return err;
write_error:
/* Maybe this physical eraseblock went bad, try to pick another one */
if (++tries <= 5)
err = ubi_scan_add_to_list(si, new_seb->pnum, new_seb->ec,
&si->corr);
kfree(new_seb);
if (!err)
if (err == -EIO && ++tries <= 5) {
/*
* Probably this physical eraseblock went bad, try to pick
* another one.
*/
list_add_tail(&new_seb->u.list, &si->corr);
goto retry;
}
kfree(new_seb);
out_free:
ubi_free_vid_hdr(ubi, vid_hdr);
return err;