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ramips: fix kernel oops in mt7621_nfc_write_page_hwecc

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`mt7621_nfc_write_page_hwecc` may be called with `buf=NULL`, but
`mt7621_nfc_check_empty_page` always tries to read it.
That caused Oops:
`Unable to handle kernel paging request at virtual address 00000000`

Fixes: FS#3416
Signed-off-by: Anton Ryzhov <anton@ryzhov.me>
This commit is contained in:
Anton Ryzhov 2020-11-01 16:06:26 +01:00 committed by Chuanhong Guo
parent be09c5a3cd
commit df469befdc
1 changed files with 6 additions and 4 deletions
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10
target/linux/ramips/patches-5.4/0300-mtd-rawnand-add-driver-support-for-MT7621-nand-flash.patch
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@ -47,7 +47,7 @@ Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
--- /dev/null
+++ b/drivers/mtd/nand/raw/mt7621_nand.c
@@ -0,0 +1,1348 @@
@@ -0,0 +1,1350 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MediaTek MT7621 NAND Flash Controller driver
@ -1155,9 +1155,11 @@ Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
+ uint32_t i, j;
+ u8 *oobptr;
+
+ for (i = 0; i < mtd->writesize; i++)
+ if (buf[i] != 0xff)
+ return 0;
+ if (buf) {
+ for (i = 0; i < mtd->writesize; i++)
+ if (buf[i] != 0xff)
+ return 0;
+ }
+
+ for (i = 0; i < nand->ecc.steps; i++) {
+ oobptr = oob_fdm_ptr(nand, i);