diff options
| author | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2007-02-18 13:52:14 +0000 |
|---|---|---|
| committer | nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2007-02-18 13:52:14 +0000 |
| commit | a7cb17cea9375f522cb87b2d53808e1cfaa713c1 (patch) | |
| tree | 5a537257117b5d6a0af901cf3fe966100addd352 /target/linux/generic-2.6/patches | |
| parent | 28a667defe73472438d7607d26530cf24b68488e (diff) | |
Finally fix the pesky x86-2.6 block2mtd related crash (#1058)
When erasing blocks, block2mtd checks the block on the physical disk
to see if everything's filled with 0xff. When grabbing a page from the page
cache, it initializes the limit as <start address> + PAGE_SIZE.
Turns out that the pointer to the status page is (unsigned long *), and
thus it adds (PAGE_SIZE * 4).
This would never have been caught, if it wasn't for the unlikely event
that block2mtd catches the *last* page available in the system ram and
thus tries to scan 4 memory pages from there.
The absolutely trivial fix is to do a double cast (cast to (u8 *), add
PAGE_SIZE, then cast to (unsigned long *))
... and there was much rejoicing
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@6318 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/generic-2.6/patches')
| -rw-r--r-- | target/linux/generic-2.6/patches/212-block2mtd_erase_scan.patch | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches/212-block2mtd_erase_scan.patch b/target/linux/generic-2.6/patches/212-block2mtd_erase_scan.patch new file mode 100644 index 000000000..76b4f5d4c --- /dev/null +++ b/target/linux/generic-2.6/patches/212-block2mtd_erase_scan.patch @@ -0,0 +1,11 @@ +--- linux.dev/drivers/mtd/devices/block2mtd.c.old 2007-02-18 14:08:59.519952312 +0100 ++++ linux.dev/drivers/mtd/devices/block2mtd.c 2007-02-18 14:09:04.219237912 +0100 +@@ -111,7 +111,7 @@ + if (IS_ERR(page)) + return PTR_ERR(page); + +- max = (u_long*)page_address(page) + PAGE_SIZE; ++ max = (u_long*) ((u8 *) page_address(page) + PAGE_SIZE); + for (p=(u_long*)page_address(page); p<max; p++) + if (*p != -1UL) { + lock_page(page); |