diff options
Diffstat (limited to 'kernel/power/hibernate.c')
| -rw-r--r-- | kernel/power/hibernate.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 4b0b7cf2e019..76b7ff619c90 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -47,6 +47,15 @@ dev_t swsusp_resume_device; sector_t swsusp_resume_block; __visible int in_suspend __nosavedata; +static const char *default_compressor = CONFIG_HIBERNATION_DEF_COMP; + +/* + * Compression/decompression algorithm to be used while saving/loading + * image to/from disk. This would later be used in 'kernel/power/swap.c' + * to allocate comp streams. + */ +char hib_comp_algo[CRYPTO_MAX_ALG_NAME]; + enum { HIBERNATION_INVALID, HIBERNATION_PLATFORM, @@ -732,6 +741,17 @@ int hibernate(void) return -EPERM; } + /* + * Query for the compression algorithm support if compression is enabled. + */ + if (!nocompress) { + strscpy(hib_comp_algo, default_compressor, sizeof(hib_comp_algo)); + if (crypto_has_comp(hib_comp_algo, 0, 0) != 1) { + pr_err("%s compression is not available\n", hib_comp_algo); + return -EOPNOTSUPP; + } + } + sleep_flags = lock_system_sleep(); /* The snapshot device should not be opened while we're running */ if (!hibernate_acquire()) { @@ -955,6 +975,19 @@ static int software_resume(void) if (error) goto Unlock; + /* + * Check if the hibernation image is compressed. If so, query for + * the algorithm support. + */ + if (!(swsusp_header_flags & SF_NOCOMPRESS_MODE)) { + strscpy(hib_comp_algo, default_compressor, sizeof(hib_comp_algo)); + if (crypto_has_comp(hib_comp_algo, 0, 0) != 1) { + pr_err("%s compression is not available\n", hib_comp_algo); + error = -EOPNOTSUPP; + goto Unlock; + } + } + /* The snapshot device should not be opened while we're running */ if (!hibernate_acquire()) { error = -EBUSY; |