Messages in this thread Patch in this message | | | From | Sergey Senozhatsky <> | Subject | [PATCH] zram: cut the trailing new-line in algorithm name | Date | Fri, 22 May 2015 18:34:34 +0900 |
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supplied sysfs values sometimes contain new-line symbols, which we also copy as a compression algorithm name. this works fine, because we use sysfs_streq(), which takes care of new line symbols, when we lookup for compression algorithm. we print its name if zcomp_create() has failed, which unfortunately doesn't lok too good
zram: Cannot initialise LXZ compressing backend
cut the trailing new-line symbol, so the reporting line will look like
zram: Cannot initialise LXZ compressing backend
we also now can replace sysfs_streq() in zcomp_available_show() with strcmp().
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> --- drivers/block/zram/zcomp.c | 2 +- drivers/block/zram/zram_drv.c | 12 ++++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c index f1ff39a..a1a8b8e 100644 --- a/drivers/block/zram/zcomp.c +++ b/drivers/block/zram/zcomp.c @@ -274,7 +274,7 @@ ssize_t zcomp_available_show(const char *comp, char *buf) int i = 0; while (backends[i]) { - if (sysfs_streq(comp, backends[i]->name)) + if (!strcmp(comp, backends[i]->name)) sz += scnprintf(buf + sz, PAGE_SIZE - sz - 2, "[%s] ", backends[i]->name); else diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index f401883..26d23b8 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -363,6 +363,13 @@ static ssize_t comp_algorithm_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct zram *zram = dev_to_zram(dev); + size_t sz; + + if (len <= 1) { + pr_err("Invalid compression backend name\n"); + return -EINVAL; + } + down_write(&zram->init_lock); if (init_done(zram)) { up_write(&zram->init_lock); @@ -371,6 +378,11 @@ static ssize_t comp_algorithm_store(struct device *dev, } strlcpy(zram->compressor, buf, sizeof(zram->compressor)); up_write(&zram->init_lock); + + /* cut the trailing new-line */ + sz = strlen(zram->compressor) - 1; + if (zram->compressor[sz] == '\n') + zram->compressor[sz] = 0x00; return len; } -- 2.4.1.168.g1ea28e1
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