linux-kernel - [PATCH] UBI: Fix allocation of volume table

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Message-ID: <20090811092524.12e4494b@ustc>
Date:	Tue, 11 Aug 2009 09:25:24 +0800
From:	JiSheng Zhang <jszhang3@...il.com>
To:	linux-mtd@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Artem.Bityutskiy@...ia.com,
	adrian.hunter@...ia.com, rmk@....linux.org.uk, dwmw2@...radead.org
Subject: [PATCH] UBI: Fix allocation of volume table


We can't use vmalloc for the buffer used for volume table for some NAND
or NOR drivers may pass the buffer to DMA. And the volume table size
a.k.a vtbl_size is small so we can use kmalloc or kzalloc for it instead.

Signed-off-by: JiSheng Zhang <jszhang3@...il.com>
---
 drivers/mtd/ubi/vtbl.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/ubi/vtbl.c b/drivers/mtd/ubi/vtbl.c
index 1afc61e..9dcc7ba 100644
--- a/drivers/mtd/ubi/vtbl.c
+++ b/drivers/mtd/ubi/vtbl.c
@@ -424,12 +424,11 @@ static struct ubi_vtbl_record *process_lvol(struct ubi_device *ubi,
 
 	/* Read both LEB 0 and LEB 1 into memory */
 	ubi_rb_for_each_entry(rb, seb, &sv->root, u.rb) {
-		leb[seb->lnum] = vmalloc(ubi->vtbl_size);
+		leb[seb->lnum] = kzalloc(ubi->vtbl_size, GFP_KERNEL);
 		if (!leb[seb->lnum]) {
 			err = -ENOMEM;
 			goto out_free;
 		}
-		memset(leb[seb->lnum], 0, ubi->vtbl_size);
 
 		err = ubi_io_read_data(ubi, leb[seb->lnum], seb->pnum, 0,
 				       ubi->vtbl_size);
@@ -515,10 +514,9 @@ static struct ubi_vtbl_record *create_empty_lvol(struct ubi_device *ubi,
 	int i;
 	struct ubi_vtbl_record *vtbl;
 
-	vtbl = vmalloc(ubi->vtbl_size);
+	vtbl = kzalloc(ubi->vtbl_size, GFP_KERNEL);
 	if (!vtbl)
 		return ERR_PTR(-ENOMEM);
-	memset(vtbl, 0, ubi->vtbl_size);
 
 	for (i = 0; i < ubi->vtbl_slots; i++)
 		memcpy(&vtbl[i], &empty_vtbl_record, UBI_VTBL_RECORD_SIZE);
-- 
1.6.3.3




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