1 files changed, 29 insertions, 37 deletions

diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index ba5bc4a5379..52476d884c4 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -98,8 +98,8 @@ static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum,
 static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum);
 static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum,
                                   const struct ubi_vid_hdr *vid_hdr);
-static int paranoid_check_all_ff(const struct ubi_device *ubi, int pnum,
-                                 int offset, int len);
+static int paranoid_check_all_ff(struct ubi_device *ubi, int pnum, int offset,
+                                 int len);
 #else
 #define paranoid_check_not_bad(ubi, pnum) 0
 #define paranoid_check_peb_ec_hdr(ubi, pnum)  0
@@ -202,8 +202,8 @@ retry:
  * Note, in case of an error, it is possible that something was still written
  * to the flash media, but may be some garbage.
  */
-int ubi_io_write(const struct ubi_device *ubi, const void *buf, int pnum,
-                 int offset, int len)
+int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
+                 int len)
 {
         int err;
         size_t written;
@@ -285,7 +285,7 @@ static void erase_callback(struct erase_info *ei)
  * zero in case of success and a negative error code in case of failure. If
  * %-EIO is returned, the physical eraseblock most probably went bad.
  */
-static int do_sync_erase(const struct ubi_device *ubi, int pnum)
+static int do_sync_erase(struct ubi_device *ubi, int pnum)
 {
         int err, retries = 0;
         struct erase_info ei;
@@ -377,29 +377,25 @@ static uint8_t patterns[] = {0xa5, 0x5a, 0x0};
  * test, a positive number of erase operations done if the test was
  * successfully passed, and other negative error codes in case of other errors.
  */
-static int torture_peb(const struct ubi_device *ubi, int pnum)
+static int torture_peb(struct ubi_device *ubi, int pnum)
 {
-        void *buf;
         int err, i, patt_count;
 
-        buf = vmalloc(ubi->peb_size);
-        if (!buf)
-                return -ENOMEM;
-
         patt_count = ARRAY_SIZE(patterns);
         ubi_assert(patt_count > 0);
 
+        mutex_lock(&ubi->buf_mutex);
         for (i = 0; i < patt_count; i++) {
                 err = do_sync_erase(ubi, pnum);
                 if (err)
                         goto out;
 
                 /* Make sure the PEB contains only 0xFF bytes */
-                err = ubi_io_read(ubi, buf, pnum, 0, ubi->peb_size);
+                err = ubi_io_read(ubi, ubi->peb_buf1, pnum, 0, ubi->peb_size);
                 if (err)
                         goto out;
 
-                err = check_pattern(buf, 0xFF, ubi->peb_size);
+                err = check_pattern(ubi->peb_buf1, 0xFF, ubi->peb_size);
                 if (err == 0) {
                         ubi_err("erased PEB %d, but a non-0xFF byte found",
                                 pnum);
@@ -408,17 +404,17 @@ static int torture_peb(const struct ubi_device *ubi, int pnum)
                 }
 
                 /* Write a pattern and check it */
-                memset(buf, patterns[i], ubi->peb_size);
-                err = ubi_io_write(ubi, buf, pnum, 0, ubi->peb_size);
+                memset(ubi->peb_buf1, patterns[i], ubi->peb_size);
+                err = ubi_io_write(ubi, ubi->peb_buf1, pnum, 0, ubi->peb_size);
                 if (err)
                         goto out;
 
-                memset(buf, ~patterns[i], ubi->peb_size);
-                err = ubi_io_read(ubi, buf, pnum, 0, ubi->peb_size);
+                memset(ubi->peb_buf1, ~patterns[i], ubi->peb_size);
+                err = ubi_io_read(ubi, ubi->peb_buf1, pnum, 0, ubi->peb_size);
                 if (err)
                         goto out;
 
-                err = check_pattern(buf, patterns[i], ubi->peb_size);
+                err = check_pattern(ubi->peb_buf1, patterns[i], ubi->peb_size);
                 if (err == 0) {
                         ubi_err("pattern %x checking failed for PEB %d",
                                 patterns[i], pnum);
@@ -430,6 +426,7 @@ static int torture_peb(const struct ubi_device *ubi, int pnum)
         err = patt_count;
 
 out:
+        mutex_unlock(&ubi->buf_mutex);
         if (err == UBI_IO_BITFLIPS || err == -EBADMSG) {
                 /*
                  * If a bit-flip or data integrity error was detected, the test
@@ -440,7 +437,6 @@ out:
                         pnum);
                 err = -EIO;
         }
-        vfree(buf);
         return err;
 }
 
@@ -460,7 +456,7 @@ out:
  * codes in case of other errors. Note, %-EIO means that the physical
  * eraseblock is bad.
  */
-int ubi_io_sync_erase(const struct ubi_device *ubi, int pnum, int torture)
+int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture)
 {
         int err, ret = 0;
 
@@ -617,7 +613,7 @@ bad:
  * o %UBI_IO_PEB_EMPTY if the physical eraseblock is empty;
  * o a negative error code in case of failure.
  */
-int ubi_io_read_ec_hdr(const struct ubi_device *ubi, int pnum,
+int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
                        struct ubi_ec_hdr *ec_hdr, int verbose)
 {
         int err, read_err = 0;
@@ -723,7 +719,7 @@ int ubi_io_read_ec_hdr(const struct ubi_device *ubi, int pnum,
  * case of failure. If %-EIO is returned, the physical eraseblock most probably
  * went bad.
  */
-int ubi_io_write_ec_hdr(const struct ubi_device *ubi, int pnum,
+int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
                         struct ubi_ec_hdr *ec_hdr)
 {
         int err;
@@ -889,7 +885,7 @@ bad:
  *   header there);
  * o a negative error code in case of failure.
  */
-int ubi_io_read_vid_hdr(const struct ubi_device *ubi, int pnum,
+int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
                         struct ubi_vid_hdr *vid_hdr, int verbose)
 {
         int err, read_err = 0;
@@ -996,7 +992,7 @@ int ubi_io_read_vid_hdr(const struct ubi_device *ubi, int pnum,
  * case of failure. If %-EIO is returned, the physical eraseblock probably went
  * bad.
  */
-int ubi_io_write_vid_hdr(const struct ubi_device *ubi, int pnum,
+int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
                          struct ubi_vid_hdr *vid_hdr)
 {
         int err;
@@ -1219,44 +1215,40 @@ exit:
  * @offset of the physical eraseblock @pnum, %1 if not, and a negative error
  * code if an error occurred.
  */
-static int paranoid_check_all_ff(const struct ubi_device *ubi, int pnum,
-                                 int offset, int len)
+static int paranoid_check_all_ff(struct ubi_device *ubi, int pnum, int offset,
+                                 int len)
 {
         size_t read;
         int err;
-        void *buf;
         loff_t addr = (loff_t)pnum * ubi->peb_size + offset;
 
-        buf = vmalloc(len);
-        if (!buf)
-                return -ENOMEM;
-        memset(buf, 0, len);
-
-        err = ubi->mtd->read(ubi->mtd, addr, len, &read, buf);
+        mutex_lock(&ubi->dbg_buf_mutex);
+        err = ubi->mtd->read(ubi->mtd, addr, len, &read, ubi->dbg_peb_buf);
         if (err && err != -EUCLEAN) {
                 ubi_err("error %d while reading %d bytes from PEB %d:%d, "
                         "read %zd bytes", err, len, pnum, offset, read);
                 goto error;
         }
 
-        err = check_pattern(buf, 0xFF, len);
+        err = check_pattern(ubi->dbg_peb_buf, 0xFF, len);
         if (err == 0) {
                 ubi_err("flash region at PEB %d:%d, length %d does not "
                         "contain all 0xFF bytes", pnum, offset, len);
                 goto fail;
         }
+        mutex_unlock(&ubi->dbg_buf_mutex);
 
-        vfree(buf);
         return 0;
 
 fail:
         ubi_err("paranoid check failed for PEB %d", pnum);
         dbg_msg("hex dump of the %d-%d region", offset, offset + len);
-        print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 4, buf, len, 1);
+        print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 4,
+                       ubi->dbg_peb_buf, len, 1);
         err = 1;
 error:
         ubi_dbg_dump_stack();
-        vfree(buf);
+        mutex_unlock(&ubi->dbg_buf_mutex);
         return err;
 }