From: Jerome Marchand Date: Wed, 13 Jul 2011 15:20:05 +0000 (+0200) Subject: Staging: zram: Fix kunmapping order X-Git-Tag: firefly_0821_release~3680^2~4924^2~10 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=dffbb44d5575facfb38a57cbb2925b03a5fc751b;p=firefly-linux-kernel-4.4.55.git Staging: zram: Fix kunmapping order This patch fixes the unmapping order of KM_USER0/1 in handle_uncompressed_page() and zram_read() so that kmap()/kunmap() calls are correctly nested. Reported-by: Nitin Gupta Signed-off-by: Jerome Marchand Reviewed-by: Nitin Gupta Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index c5fdc5536186..d70ec1ad10de 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -199,8 +199,8 @@ static void handle_uncompressed_page(struct zram *zram, struct bio_vec *bvec, cmem = kmap_atomic(zram->table[index].page, KM_USER1); memcpy(user_mem + bvec->bv_offset, cmem + offset, bvec->bv_len); - kunmap_atomic(user_mem, KM_USER0); kunmap_atomic(cmem, KM_USER1); + kunmap_atomic(user_mem, KM_USER0); flush_dcache_page(page); } @@ -267,8 +267,8 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec, kfree(uncmem); } - kunmap_atomic(user_mem, KM_USER0); kunmap_atomic(cmem, KM_USER1); + kunmap_atomic(user_mem, KM_USER0); /* Should NEVER happen. Return bio error if it does. */ if (unlikely(ret != LZO_E_OK)) {