From eca95cb6b47a4190d3cf110d51ba186eb40e3a44 Mon Sep 17 00:00:00 2001 From: Jagdish Gediya Date: Wed, 21 Mar 2018 05:51:46 +0530 Subject: mtd: nand: fsl_ifc: Fix eccstat array overflow for IFC ver >= 2.0.0 commit 843c3a59997f18060848b8632607dd04781b52d1 upstream. Number of ECC status registers i.e. (ECCSTATx) has been increased in IFC version 2.0.0 due to increase in SRAM size. This is causing eccstat array to over flow. So, replace eccstat array with u32 variable to make it fail-safe and independent of number of ECC status registers or SRAM size. Fixes: bccb06c353af ("mtd: nand: ifc: update bufnum mask for ver >= 2.0.0") Cc: stable@vger.kernel.org # 3.18+ Signed-off-by: Prabhakar Kushwaha Signed-off-by: Jagdish Gediya Signed-off-by: Boris Brezillon Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/nand/fsl_ifc_nand.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c index a4d78c57b1e1..97e6f37a742e 100644 --- a/drivers/mtd/nand/fsl_ifc_nand.c +++ b/drivers/mtd/nand/fsl_ifc_nand.c @@ -201,14 +201,9 @@ static int is_blank(struct mtd_info *mtd, unsigned int bufnum) /* returns nonzero if entire page is blank */ static int check_read_ecc(struct mtd_info *mtd, struct fsl_ifc_ctrl *ctrl, - u32 *eccstat, unsigned int bufnum) + u32 eccstat, unsigned int bufnum) { - u32 reg = eccstat[bufnum / 4]; - int errors; - - errors = (reg >> ((3 - bufnum % 4) * 8)) & 15; - - return errors; + return (eccstat >> ((3 - bufnum % 4) * 8)) & 15; } /* @@ -221,7 +216,7 @@ static void fsl_ifc_run_command(struct mtd_info *mtd) struct fsl_ifc_ctrl *ctrl = priv->ctrl; struct fsl_ifc_nand_ctrl *nctrl = ifc_nand_ctrl; struct fsl_ifc_runtime __iomem *ifc = ctrl->rregs; - u32 eccstat[4]; + u32 eccstat; int i; /* set the chip select for NAND Transaction */ @@ -256,8 +251,8 @@ static void fsl_ifc_run_command(struct mtd_info *mtd) if (nctrl->eccread) { int errors; int bufnum = nctrl->page & priv->bufnum_mask; - int sector = bufnum * chip->ecc.steps; - int sector_end = sector + chip->ecc.steps - 1; + int sector_start = bufnum * chip->ecc.steps; + int sector_end = sector_start + chip->ecc.steps - 1; __be32 *eccstat_regs; if (ctrl->version >= FSL_IFC_VERSION_2_0_0) @@ -265,10 +260,12 @@ static void fsl_ifc_run_command(struct mtd_info *mtd) else eccstat_regs = ifc->ifc_nand.v1_nand_eccstat; - for (i = sector / 4; i <= sector_end / 4; i++) - eccstat[i] = ifc_in32(&eccstat_regs[i]); + eccstat = ifc_in32(&eccstat_regs[sector_start / 4]); + + for (i = sector_start; i <= sector_end; i++) { + if (i != sector_start && !(i % 4)) + eccstat = ifc_in32(&eccstat_regs[i / 4]); - for (i = sector; i <= sector_end; i++) { errors = check_read_ecc(mtd, ctrl, eccstat, i); if (errors == 15) { -- cgit v1.2.3