lightnvm: pblk: simplify meta. memory allocation

smeta size will always be suitable for a kmalloc allocation. Simplify
the code and leave the vmalloc fallback only for emeta, where the pblk
configuration has an impact.
Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-core.c

@@ -665,7 +665,8 @@ static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
 	}
 	reinit_completion(&wait);
 
-	bio_put(bio);
+	if (likely(pblk->l_mg.emeta_alloc_type == PBLK_VMALLOC_META))
+		bio_put(bio);
 
 	if (rqd.error) {
 		if (dir == WRITE)

drivers/lightnvm/pblk-init.c

@@ -355,9 +355,9 @@ static void pblk_line_meta_free(struct pblk *pblk)
 	kfree(l_mg->vsc_list);
 
 	for (i = 0; i < PBLK_DATA_LINES; i++) {
-		pblk_mfree(&l_mg->sline_meta[i], l_mg->smeta_alloc_type);
+		kfree(l_mg->sline_meta[i]);
 		pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
-		kfree(&l_mg->eline_meta[i]);
+		kfree(l_mg->eline_meta[i]);
 	}
 
 	kfree(pblk->lines);
@@ -550,7 +550,6 @@ static int pblk_lines_alloc_metadata(struct pblk *pblk)
 	/* smeta is always small enough to fit on a kmalloc memory allocation,
 	 * emeta depends on the number of LUNs allocated to the pblk instance
 	 */
-	l_mg->smeta_alloc_type = PBLK_KMALLOC_META;
 	for (i = 0; i < PBLK_DATA_LINES; i++) {
 		l_mg->sline_meta[i] = kmalloc(lm->smeta_len, GFP_KERNEL);
 		if (!l_mg->sline_meta[i])
@@ -604,12 +603,12 @@ static int pblk_lines_alloc_metadata(struct pblk *pblk)
 fail_free_emeta:
 	while (--i >= 0) {
 		vfree(l_mg->eline_meta[i]->buf);
-		kfree(&l_mg->eline_meta[i]);
+		kfree(l_mg->eline_meta[i]);
 	}
 
 fail_free_smeta:
 	for (i = 0; i < PBLK_DATA_LINES; i++)
-		pblk_mfree(&l_mg->sline_meta[i], l_mg->smeta_alloc_type);
+		kfree(l_mg->sline_meta[i]);
 
 	return -ENOMEM;
 }

drivers/lightnvm/pblk-write.c

@@ -442,7 +442,8 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
 	list_add(&meta_line->list, &meta_line->list);
 	spin_unlock(&l_mg->close_lock);
 fail_free_bio:
-	bio_put(bio);
+	if (likely(l_mg->emeta_alloc_type == PBLK_VMALLOC_META))
+		bio_put(bio);
 fail_free_rqd:
 	pblk_free_rqd(pblk, rqd, READ);
 	return ret;

drivers/lightnvm/pblk.h

@@ -446,7 +446,6 @@ struct pblk_line_mgmt {
 	__le32 *vsc_list;		/* Valid sector counts for all lines */
 
 	/* Metadata allocation type: VMALLOC | KMALLOC */
-	int smeta_alloc_type;
 	int emeta_alloc_type;
 
 	/* Pre-allocated metadata for data lines */