[PATCH 1/1] fw_setenv: lock the flash only if it was locked before

[Ivan Mikhaylov]

u-boot-env flash region lock/unlock may affect other regions than
u-boot-env, fw_setenv does this in a way 'Lock it in any cases'.
Change this to 'lock it if it was locked before'.

Signed-off-by: Ivan Mikhaylov <fr0st6...@gmail.com>
---
 tools/env/fw_env.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index 381739d28d..3c01f52f3b 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -989,6 +989,7 @@ static int flash_write_buf(int dev, int fd, void *buf, 
size_t count)
                                   of the data */
        loff_t blockstart;      /* running start of the current block -
                                   MEMGETBADBLOCK needs 64 bits */
+       int was_locked;         /* flash lock flag */
        int rc;
 
        /*
@@ -1074,6 +1075,12 @@ static int flash_write_buf(int dev, int fd, void *buf, 
size_t count)
        }
 
        erase.length = erasesize;
+       if (DEVTYPE(dev) != MTD_ABSENT) {
+               was_locked = ioctl(fd, MEMISLOCKED, &erase);
+               /* treat any errors as unlocked flash */
+               if (was_locked < 0)
+                       was_locked = 0;
+       }
 
        /* This only runs once on NOR flash and SPI-dataflash */
        while (processed < write_total) {
@@ -1093,7 +1100,8 @@ static int flash_write_buf(int dev, int fd, void *buf, 
size_t count)
 
                if (DEVTYPE(dev) != MTD_ABSENT) {
                        erase.start = blockstart;
-                       ioctl(fd, MEMUNLOCK, &erase);
+                       if (was_locked)
+                               ioctl(fd, MEMUNLOCK, &erase);
                        /* These do not need an explicit erase cycle */
                        if (DEVTYPE(dev) != MTD_DATAFLASH)
                                if (ioctl(fd, MEMERASE, &erase) != 0) {
@@ -1121,8 +1129,10 @@ static int flash_write_buf(int dev, int fd, void *buf, 
size_t count)
                        return -1;
                }
 
-               if (DEVTYPE(dev) != MTD_ABSENT)
-                       ioctl(fd, MEMLOCK, &erase);
+               if (DEVTYPE(dev) != MTD_ABSENT) {
+                       if (was_locked)
+                               ioctl(fd, MEMLOCK, &erase);
+               }
 
                processed += erasesize;
                block_seek = 0;
@@ -1143,7 +1153,9 @@ static int flash_flag_obsolete(int dev, int fd, off_t 
offset)
        int rc;
        struct erase_info_user erase;
        char tmp = ENV_REDUND_OBSOLETE;
+       int was_locked; /* flash lock flag */
 
+       was_locked = ioctl(fd, MEMISLOCKED, &erase);
        erase.start = DEVOFFSET(dev);
        erase.length = DEVESIZE(dev);
        /* This relies on the fact, that ENV_REDUND_OBSOLETE == 0 */
@@ -1153,9 +1165,11 @@ static int flash_flag_obsolete(int dev, int fd, off_t 
offset)
                        DEVNAME(dev));
                return rc;
        }
-       ioctl(fd, MEMUNLOCK, &erase);
+       if (was_locked)
+               ioctl(fd, MEMUNLOCK, &erase);
        rc = write(fd, &tmp, sizeof(tmp));
-       ioctl(fd, MEMLOCK, &erase);
+       if (was_locked)
+               ioctl(fd, MEMLOCK, &erase);
        if (rc < 0)
                perror("Could not set obsolete flag");
 
-- 
2.21.1